Integrate from google internal.

Java files are moved to un-do the hack in the prevous commit, which
moved the java files to the original position for integration.

144 files changed, 660 insertions, 741 deletions

diff --git a/java/src/main/java/com/google/protobuf/AbstractMessage.java b/java/core/src/main/java/com/google/protobuf/AbstractMessage.java
index 9f418f2b..9f418f2b 100644
--- a/java/src/main/java/com/google/protobuf/AbstractMessage.java
+++ b/java/core/src/main/java/com/google/protobuf/AbstractMessage.java
diff --git a/java/src/main/java/com/google/protobuf/AbstractMessageLite.java b/java/core/src/main/java/com/google/protobuf/AbstractMessageLite.java
index 12384983..12384983 100644
--- a/java/src/main/java/com/google/protobuf/AbstractMessageLite.java
+++ b/java/core/src/main/java/com/google/protobuf/AbstractMessageLite.java
diff --git a/java/src/main/java/com/google/protobuf/AbstractParser.java b/java/core/src/main/java/com/google/protobuf/AbstractParser.java
index 1a4c6311..1a4c6311 100644
--- a/java/src/main/java/com/google/protobuf/AbstractParser.java
+++ b/java/core/src/main/java/com/google/protobuf/AbstractParser.java
diff --git a/java/src/main/java/com/google/protobuf/AbstractProtobufList.java b/java/core/src/main/java/com/google/protobuf/AbstractProtobufList.java
index bb6446b2..bb6446b2 100644
--- a/java/src/main/java/com/google/protobuf/AbstractProtobufList.java
+++ b/java/core/src/main/java/com/google/protobuf/AbstractProtobufList.java
diff --git a/java/src/main/java/com/google/protobuf/BlockingRpcChannel.java b/java/core/src/main/java/com/google/protobuf/BlockingRpcChannel.java
index d535efb9..d535efb9 100644
--- a/java/src/main/java/com/google/protobuf/BlockingRpcChannel.java
+++ b/java/core/src/main/java/com/google/protobuf/BlockingRpcChannel.java
diff --git a/java/src/main/java/com/google/protobuf/BlockingService.java b/java/core/src/main/java/com/google/protobuf/BlockingService.java
index d01f0b8f..d01f0b8f 100644
--- a/java/src/main/java/com/google/protobuf/BlockingService.java
+++ b/java/core/src/main/java/com/google/protobuf/BlockingService.java
diff --git a/java/src/main/java/com/google/protobuf/BooleanArrayList.java b/java/core/src/main/java/com/google/protobuf/BooleanArrayList.java
index 70e042f5..70e042f5 100644
--- a/java/src/main/java/com/google/protobuf/BooleanArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/BooleanArrayList.java
diff --git a/java/src/main/java/com/google/protobuf/ByteString.java b/java/core/src/main/java/com/google/protobuf/ByteString.java
index 68f20d51..305236f3 100644
--- a/java/src/main/java/com/google/protobuf/ByteString.java
+++ b/java/core/src/main/java/com/google/protobuf/ByteString.java
@@ -1,38 +1,13 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// Copyright 2007 Google Inc.  All rights reserved.
 
 package com.google.protobuf;
 
+import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.InvalidObjectException;
+import java.io.ObjectInputStream;
 import java.io.OutputStream;
 import java.io.Serializable;
 import java.io.UnsupportedEncodingException;
@@ -41,6 +16,7 @@ import java.nio.charset.Charset;
 import java.nio.charset.UnsupportedCharsetException;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 import java.util.NoSuchElementException;
@@ -81,7 +57,7 @@ public abstract class ByteString implements Iterable<Byte>, Serializable {
   /**
    * Empty {@code ByteString}.
    */
-  public static final ByteString EMPTY = new LiteralByteString(new byte[0]);
+  public static final ByteString EMPTY = new LiteralByteString(Internal.EMPTY_BYTE_ARRAY);
 
   /**
    * Cached hash value. Intentionally accessed via a data race, which
@@ -258,6 +234,24 @@ public abstract class ByteString implements Iterable<Byte>, Serializable {
   public static ByteString copyFrom(byte[] bytes) {
     return copyFrom(bytes, 0, bytes.length);
   }
+  
+  /**
+   * Wraps the given bytes into a {@code ByteString}. Intended for internal only
+   * usage to force a classload of ByteString before LiteralByteString.
+   */
+  static ByteString wrap(byte[] bytes) {
+    // TODO(dweis): Return EMPTY when bytes are empty to reduce allocations?
+    return new LiteralByteString(bytes);
+  }
+
+  /**
+   * Wraps the given bytes into a {@code ByteString}. Intended for internal only
+   * usage to force a classload of ByteString before BoundedByteString and
+   * LiteralByteString.
+   */
+  static ByteString wrap(byte[] bytes, int offset, int length) {
+    return new BoundedByteString(bytes, offset, length);
+  }
 
   /**
    * Copies the next {@code size} bytes from a {@code java.nio.ByteBuffer} into
@@ -1149,4 +1143,314 @@ public abstract class ByteString implements Iterable<Byte>, Serializable {
     return String.format("<ByteString@%s size=%d>",
         Integer.toHexString(System.identityHashCode(this)), size());
   }
+  
+  /**
+   * This class implements a {@link com.google.protobuf.ByteString} backed by a
+   * single array of bytes, contiguous in memory. It supports substring by
+   * pointing to only a sub-range of the underlying byte array, meaning that a
+   * substring will reference the full byte-array of the string it's made from,
+   * exactly as with {@link String}.
+   *
+   * @author carlanton@google.com (Carl Haverl)
+   */
+  // Keep this class private to avoid deadlocks in classloading across threads as ByteString's
+  // static initializer loads LiteralByteString and another thread loads LiteralByteString.
+  private static class LiteralByteString extends ByteString.LeafByteString {
+    private static final long serialVersionUID = 1L;
+
+    protected final byte[] bytes;
+
+    /**
+     * Creates a {@code LiteralByteString} backed by the given array, without
+     * copying.
+     *
+     * @param bytes array to wrap
+     */
+    LiteralByteString(byte[] bytes) {
+      this.bytes = bytes;
+    }
+
+    @Override
+    public byte byteAt(int index) {
+      // Unlike most methods in this class, this one is a direct implementation
+      // ignoring the potential offset because we need to do range-checking in the
+      // substring case anyway.
+      return bytes[index];
+    }
+
+    @Override
+    public int size() {
+      return bytes.length;
+    }
+
+    // =================================================================
+    // ByteString -> substring
+
+    @Override
+    public final ByteString substring(int beginIndex, int endIndex) {
+      final int length = checkRange(beginIndex, endIndex, size());
+
+      if (length == 0) {
+        return ByteString.EMPTY;
+      }
+
+      return new BoundedByteString(bytes, getOffsetIntoBytes() + beginIndex, length);
+    }
+
+    // =================================================================
+    // ByteString -> byte[]
+
+    @Override
+    protected void copyToInternal(
+        byte[] target, int sourceOffset, int targetOffset, int numberToCopy) {
+      // Optimized form, not for subclasses, since we don't call
+      // getOffsetIntoBytes() or check the 'numberToCopy' parameter.
+      // TODO(nathanmittler): Is not calling getOffsetIntoBytes really saving that much?
+      System.arraycopy(bytes, sourceOffset, target, targetOffset, numberToCopy);
+    }
+
+    @Override
+    public final void copyTo(ByteBuffer target) {
+      target.put(bytes, getOffsetIntoBytes(), size()); // Copies bytes
+    }
+
+    @Override
+    public final ByteBuffer asReadOnlyByteBuffer() {
+      return ByteBuffer.wrap(bytes, getOffsetIntoBytes(), size()).asReadOnlyBuffer();
+    }
+
+    @Override
+    public final List<ByteBuffer> asReadOnlyByteBufferList() {
+      return Collections.singletonList(asReadOnlyByteBuffer());
+    }
+
+    @Override
+    public final void writeTo(OutputStream outputStream) throws IOException {
+      outputStream.write(toByteArray());
+    }
+
+    @Override
+    final void writeToInternal(OutputStream outputStream, int sourceOffset, int numberToWrite)
+        throws IOException {
+      outputStream.write(bytes, getOffsetIntoBytes() + sourceOffset, numberToWrite);
+    }
+
+    @Override
+    protected final String toStringInternal(Charset charset) {
+      return new String(bytes, getOffsetIntoBytes(), size(), charset);
+    }
+
+    // =================================================================
+    // UTF-8 decoding
+
+    @Override
+    public final boolean isValidUtf8() {
+      int offset = getOffsetIntoBytes();
+      return Utf8.isValidUtf8(bytes, offset, offset + size());
+    }
+
+    @Override
+    protected final int partialIsValidUtf8(int state, int offset, int length) {
+      int index = getOffsetIntoBytes() + offset;
+      return Utf8.partialIsValidUtf8(state, bytes, index, index + length);
+    }
+
+    // =================================================================
+    // equals() and hashCode()
+
+    @Override
+    public final boolean equals(Object other) {
+      if (other == this) {
+        return true;
+      }
+      if (!(other instanceof ByteString)) {
+        return false;
+      }
+
+      if (size() != ((ByteString) other).size()) {
+        return false;
+      }
+      if (size() == 0) {
+        return true;
+      }
+
+      if (other instanceof LiteralByteString) {
+        LiteralByteString otherAsLiteral = (LiteralByteString) other;
+        // If we know the hash codes and they are not equal, we know the byte
+        // strings are not equal.
+        int thisHash = peekCachedHashCode();
+        int thatHash = otherAsLiteral.peekCachedHashCode();
+        if (thisHash != 0 && thatHash != 0 && thisHash != thatHash) {
+          return false;
+        }
+
+        return equalsRange((LiteralByteString) other, 0, size());
+      } else {
+        // RopeByteString and NioByteString.
+        return other.equals(this);
+      }
+    }
+
+    /**
+     * Check equality of the substring of given length of this object starting at
+     * zero with another {@code LiteralByteString} substring starting at offset.
+     *
+     * @param other  what to compare a substring in
+     * @param offset offset into other
+     * @param length number of bytes to compare
+     * @return true for equality of substrings, else false.
+     */
+    @Override
+    final boolean equalsRange(ByteString other, int offset, int length) {
+      if (length > other.size()) {
+        throw new IllegalArgumentException("Length too large: " + length + size());
+      }
+      if (offset + length > other.size()) {
+        throw new IllegalArgumentException(
+            "Ran off end of other: " + offset + ", " + length + ", " + other.size());
+      }
+
+      if (other instanceof LiteralByteString) {
+        LiteralByteString lbsOther = (LiteralByteString) other;
+        byte[] thisBytes = bytes;
+        byte[] otherBytes = lbsOther.bytes;
+        int thisLimit = getOffsetIntoBytes() + length;
+        for (
+            int thisIndex = getOffsetIntoBytes(),
+                otherIndex = lbsOther.getOffsetIntoBytes() + offset;
+            (thisIndex < thisLimit); ++thisIndex, ++otherIndex) {
+          if (thisBytes[thisIndex] != otherBytes[otherIndex]) {
+            return false;
+          }
+        }
+        return true;
+      }
+
+      return other.substring(offset, offset + length).equals(substring(0, length));
+    }
+
+    @Override
+    protected final int partialHash(int h, int offset, int length) {
+      return Internal.partialHash(h, bytes, getOffsetIntoBytes() + offset, length);
+    }
+
+    // =================================================================
+    // Input stream
+
+    @Override
+    public final InputStream newInput() {
+      return new ByteArrayInputStream(bytes, getOffsetIntoBytes(), size()); // No copy
+    }
+
+    @Override
+    public final CodedInputStream newCodedInput() {
+      // We trust CodedInputStream not to modify the bytes, or to give anyone
+      // else access to them.
+      return CodedInputStream.newInstance(
+          bytes, getOffsetIntoBytes(), size(), true /* bufferIsImmutable */);
+    }
+
+    // =================================================================
+    // Internal methods
+
+    /**
+     * Offset into {@code bytes[]} to use, non-zero for substrings.
+     *
+     * @return always 0 for this class
+     */
+    protected int getOffsetIntoBytes() {
+      return 0;
+    }
+  }
+  
+  /**
+   * This class is used to represent the substring of a {@link ByteString} over a
+   * single byte array. In terms of the public API of {@link ByteString}, you end
+   * up here by calling {@link ByteString#copyFrom(byte[])} followed by {@link
+   * ByteString#substring(int, int)}.
+   *
+   * <p>This class contains most of the overhead involved in creating a substring
+   * from a {@link LiteralByteString}.  The overhead involves some range-checking
+   * and two extra fields.
+   *
+   * @author carlanton@google.com (Carl Haverl)
+   */
+  // Keep this class private to avoid deadlocks in classloading across threads as ByteString's
+  // static initializer loads LiteralByteString and another thread loads BoundedByteString.
+  private static final class BoundedByteString extends LiteralByteString {
+
+    private final int bytesOffset;
+    private final int bytesLength;
+
+    /**
+     * Creates a {@code BoundedByteString} backed by the sub-range of given array,
+     * without copying.
+     *
+     * @param bytes  array to wrap
+     * @param offset index to first byte to use in bytes
+     * @param length number of bytes to use from bytes
+     * @throws IllegalArgumentException if {@code offset < 0}, {@code length < 0},
+     *                                  or if {@code offset + length >
+     *                                  bytes.length}.
+     */
+    BoundedByteString(byte[] bytes, int offset, int length) {
+      super(bytes);
+      checkRange(offset, offset + length, bytes.length);
+
+      this.bytesOffset = offset;
+      this.bytesLength = length;
+    }
+
+    /**
+     * Gets the byte at the given index.
+     * Throws {@link ArrayIndexOutOfBoundsException}
+     * for backwards-compatibility reasons although it would more properly be
+     * {@link IndexOutOfBoundsException}.
+     *
+     * @param index index of byte
+     * @return the value
+     * @throws ArrayIndexOutOfBoundsException {@code index} is < 0 or >= size
+     */
+    @Override
+    public byte byteAt(int index) {
+      // We must check the index ourselves as we cannot rely on Java array index
+      // checking for substrings.
+      checkIndex(index, size());
+      return bytes[bytesOffset + index];
+    }
+
+    @Override
+    public int size() {
+      return bytesLength;
+    }
+
+    @Override
+    protected int getOffsetIntoBytes() {
+      return bytesOffset;
+    }
+
+    // =================================================================
+    // ByteString -> byte[]
+
+    @Override
+    protected void copyToInternal(byte[] target, int sourceOffset, int targetOffset,
+        int numberToCopy) {
+      System.arraycopy(bytes, getOffsetIntoBytes() + sourceOffset, target,
+          targetOffset, numberToCopy);
+    }
+
+    // =================================================================
+    // Serializable
+
+    private static final long serialVersionUID = 1L;
+
+    Object writeReplace() {
+      return ByteString.wrap(toByteArray());
+    }
+
+    private void readObject(@SuppressWarnings("unused") ObjectInputStream in) throws IOException {
+      throw new InvalidObjectException(
+          "BoundedByteStream instances are not to be serialized directly");
+    }
+  }
 }
diff --git a/java/src/main/java/com/google/protobuf/CodedInputStream.java b/java/core/src/main/java/com/google/protobuf/CodedInputStream.java
index adc91536..b3118ee0 100644
--- a/java/src/main/java/com/google/protobuf/CodedInputStream.java
+++ b/java/core/src/main/java/com/google/protobuf/CodedInputStream.java
@@ -70,7 +70,15 @@ public final class CodedInputStream {
    */
   public static CodedInputStream newInstance(final byte[] buf, final int off,
                                              final int len) {
-    CodedInputStream result = new CodedInputStream(buf, off, len);
+    return newInstance(buf, off, len, false);
+  }
+
+  /**
+   * Create a new CodedInputStream wrapping the given byte array slice.
+   */
+  public static CodedInputStream newInstance(final byte[] buf, final int off,
+                                             final int len, boolean bufferIsImmutable) {
+    CodedInputStream result = new CodedInputStream(buf, off, len, bufferIsImmutable);
     try {
       // Some uses of CodedInputStream can be more efficient if they know
       // exactly how many bytes are available.  By pushing the end point of the
@@ -113,31 +121,6 @@ public final class CodedInputStream {
     }
   }
 
-  /**
-   * Create a new CodedInputStream wrapping a LiteralByteString.
-   */
-  static CodedInputStream newInstance(LiteralByteString byteString) {
-    CodedInputStream result = new CodedInputStream(byteString);
-    try {
-      // Some uses of CodedInputStream can be more efficient if they know
-      // exactly how many bytes are available.  By pushing the end point of the
-      // buffer as a limit, we allow them to get this information via
-      // getBytesUntilLimit().  Pushing a limit that we know is at the end of
-      // the stream can never hurt, since we can never past that point anyway.
-      result.pushLimit(byteString.size());
-    } catch (InvalidProtocolBufferException ex) {
-      // The only reason pushLimit() might throw an exception here is if len
-      // is negative. Normally pushLimit()'s parameter comes directly off the
-      // wire, so it's important to catch exceptions in case of corrupt or
-      // malicious data. However, in this case, we expect that len is not a
-      // user-supplied value, so we can assume that it being negative indicates
-      // a programming error. Therefore, throwing an unchecked exception is
-      // appropriate.
-      throw new IllegalArgumentException(ex);
-    }
-    return result;
-  }
-
   // -----------------------------------------------------------------
 
   /**
@@ -506,7 +489,7 @@ public final class CodedInputStream {
       // Fast path:  We already have the bytes in a contiguous buffer, so
       //   just copy directly from it.
       final ByteString result = bufferIsImmutable && enableAliasing
-          ? new BoundedByteString(buffer, bufferPos, size)
+          ? ByteString.wrap(buffer, bufferPos, size)
           : ByteString.copyFrom(buffer, bufferPos, size);
       bufferPos += size;
       return result;
@@ -514,7 +497,7 @@ public final class CodedInputStream {
       return ByteString.EMPTY;
     } else {
       // Slow path:  Build a byte array first then copy it.
-      return new LiteralByteString(readRawBytesSlowPath(size));
+      return ByteString.wrap(readRawBytesSlowPath(size));
     }
   }
 
@@ -886,13 +869,13 @@ public final class CodedInputStream {
   private static final int DEFAULT_SIZE_LIMIT = 64 << 20;  // 64MB
   private static final int BUFFER_SIZE = 4096;
 
-  private CodedInputStream(final byte[] buffer, final int off, final int len) {
+  private CodedInputStream(final byte[] buffer, final int off, final int len, boolean bufferIsImmutable) {
     this.buffer = buffer;
     bufferSize = off + len;
     bufferPos = off;
     totalBytesRetired = -off;
     input = null;
-    bufferIsImmutable = false;
+    this.bufferIsImmutable = bufferIsImmutable;
   }
 
   private CodedInputStream(final InputStream input) {
@@ -904,15 +887,6 @@ public final class CodedInputStream {
     bufferIsImmutable = false;
   }
 
-  private CodedInputStream(final LiteralByteString byteString) {
-    buffer = byteString.bytes;
-    bufferPos = byteString.getOffsetIntoBytes();
-    bufferSize = bufferPos + byteString.size();
-    totalBytesRetired = -bufferPos;
-    input = null;
-    bufferIsImmutable = true;
-  }
-
   public void enableAliasing(boolean enabled) {
     this.enableAliasing = enabled;
   }
diff --git a/java/src/main/java/com/google/protobuf/CodedOutputStream.java b/java/core/src/main/java/com/google/protobuf/CodedOutputStream.java
index d8ebad21..d8ebad21 100644
--- a/java/src/main/java/com/google/protobuf/CodedOutputStream.java
+++ b/java/core/src/main/java/com/google/protobuf/CodedOutputStream.java
diff --git a/java/src/main/java/com/google/protobuf/Descriptors.java b/java/core/src/main/java/com/google/protobuf/Descriptors.java
index 5e15cfbe..5e15cfbe 100644
--- a/java/src/main/java/com/google/protobuf/Descriptors.java
+++ b/java/core/src/main/java/com/google/protobuf/Descriptors.java
diff --git a/java/src/main/java/com/google/protobuf/DoubleArrayList.java b/java/core/src/main/java/com/google/protobuf/DoubleArrayList.java
index bcc9d6ee..bcc9d6ee 100644
--- a/java/src/main/java/com/google/protobuf/DoubleArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/DoubleArrayList.java
diff --git a/java/src/main/java/com/google/protobuf/DynamicMessage.java b/java/core/src/main/java/com/google/protobuf/DynamicMessage.java
index 3ea1b688..3ea1b688 100644
--- a/java/src/main/java/com/google/protobuf/DynamicMessage.java
+++ b/java/core/src/main/java/com/google/protobuf/DynamicMessage.java
diff --git a/java/core/src/main/java/com/google/protobuf/ExperimentalApi.java b/java/core/src/main/java/com/google/protobuf/ExperimentalApi.java
new file mode 100644
index 00000000..6f41fb81
--- /dev/null
+++ b/java/core/src/main/java/com/google/protobuf/ExperimentalApi.java
@@ -0,0 +1,36 @@
+package com.google.protobuf;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Indicates a public API that can change at any time, and has no guarantee of API stability and
+ * backward-compatibility.
+ *
+ * <p>Usage guidelines:
+ * <ol>
+ * <li>This annotation is used only on public API. Internal interfaces should not use it.</li>
+ * <li>This annotation should only be added to new APIs. Adding it to an existing API is
+ * considered API-breaking.</li>
+ * <li>Removing this annotation from an API gives it stable status.</li>
+ * </ol>
+ */
+@Retention(RetentionPolicy.SOURCE)
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.TYPE})
+@Documented
+public @interface ExperimentalApi {
+  /**
+   * Context information such as links to discussion thread, tracking issue etc.
+   */
+  String value() default "";
+}
+
diff --git a/java/src/main/java/com/google/protobuf/Extension.java b/java/core/src/main/java/com/google/protobuf/Extension.java
index 68d29f33..68d29f33 100644
--- a/java/src/main/java/com/google/protobuf/Extension.java
+++ b/java/core/src/main/java/com/google/protobuf/Extension.java
diff --git a/java/src/main/java/com/google/protobuf/ExtensionLite.java b/java/core/src/main/java/com/google/protobuf/ExtensionLite.java
index f8f5bd2c..f8f5bd2c 100644
--- a/java/src/main/java/com/google/protobuf/ExtensionLite.java
+++ b/java/core/src/main/java/com/google/protobuf/ExtensionLite.java
diff --git a/java/src/main/java/com/google/protobuf/ExtensionRegistry.java b/java/core/src/main/java/com/google/protobuf/ExtensionRegistry.java
index 0067392f..0067392f 100644
--- a/java/src/main/java/com/google/protobuf/ExtensionRegistry.java
+++ b/java/core/src/main/java/com/google/protobuf/ExtensionRegistry.java
diff --git a/java/src/main/java/com/google/protobuf/ExtensionRegistryLite.java b/java/core/src/main/java/com/google/protobuf/ExtensionRegistryLite.java
index 65cf7385..65cf7385 100644
--- a/java/src/main/java/com/google/protobuf/ExtensionRegistryLite.java
+++ b/java/core/src/main/java/com/google/protobuf/ExtensionRegistryLite.java
diff --git a/java/src/main/java/com/google/protobuf/FieldSet.java b/java/core/src/main/java/com/google/protobuf/FieldSet.java
index 47924b65..47924b65 100644
--- a/java/src/main/java/com/google/protobuf/FieldSet.java
+++ b/java/core/src/main/java/com/google/protobuf/FieldSet.java
diff --git a/java/src/main/java/com/google/protobuf/FloatArrayList.java b/java/core/src/main/java/com/google/protobuf/FloatArrayList.java
index 033b5eed..033b5eed 100644
--- a/java/src/main/java/com/google/protobuf/FloatArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/FloatArrayList.java
diff --git a/java/src/main/java/com/google/protobuf/GeneratedMessage.java b/java/core/src/main/java/com/google/protobuf/GeneratedMessage.java
index ceb97a4e..ceb97a4e 100644
--- a/java/src/main/java/com/google/protobuf/GeneratedMessage.java
+++ b/java/core/src/main/java/com/google/protobuf/GeneratedMessage.java
diff --git a/java/src/main/java/com/google/protobuf/GeneratedMessageLite.java b/java/core/src/main/java/com/google/protobuf/GeneratedMessageLite.java
index 81e1862c..81e1862c 100644
--- a/java/src/main/java/com/google/protobuf/GeneratedMessageLite.java
+++ b/java/core/src/main/java/com/google/protobuf/GeneratedMessageLite.java
diff --git a/java/src/main/java/com/google/protobuf/IntArrayList.java b/java/core/src/main/java/com/google/protobuf/IntArrayList.java
index f4e68ed8..f4e68ed8 100644
--- a/java/src/main/java/com/google/protobuf/IntArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/IntArrayList.java
diff --git a/java/src/main/java/com/google/protobuf/Internal.java b/java/core/src/main/java/com/google/protobuf/Internal.java
index 11901998..dca5f23b 100644
--- a/java/src/main/java/com/google/protobuf/Internal.java
+++ b/java/core/src/main/java/com/google/protobuf/Internal.java
@@ -1,32 +1,4 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// Copyright 2007 Google Inc. All rights reserved.
 
 package com.google.protobuf;
 
@@ -283,10 +255,32 @@ public class Internal {
     // ByteString with the same content. This is to ensure that the generated
     // hashCode() method will return the same value as the pure reflection
     // based hashCode() method.
-    return LiteralByteString.hashCode(bytes);
+    return Internal.hashCode(bytes, 0, bytes.length);
+  }
+  
+  /**
+   * Helper method for implementing {@link LiteralByteString#hashCode()}.
+   */
+  static int hashCode(byte[] bytes, int offset, int length) {
+    // The hash code for a byte array should be the same as the hash code for a
+    // ByteString with the same content. This is to ensure that the generated
+    // hashCode() method will return the same value as the pure reflection
+    // based hashCode() method.
+    int h = Internal.partialHash(length, bytes, offset, length);
+    return h == 0 ? 1 : h;
   }
 
   /**
+   * Helper method for continuously hashing bytes.
+   */
+  static int partialHash(int h, byte[] bytes, int offset, int length) {
+    for (int i = offset; i < offset + length; i++) {
+      h = h * 31 + bytes[i];
+    }
+    return h;
+  }
+  
+  /**
    * Helper method for implementing {@link Message#equals(Object)} for bytes
    * field.
    */
@@ -337,8 +331,7 @@ public class Internal {
   public static int hashCodeByteBuffer(ByteBuffer bytes) {
     if (bytes.hasArray()) {
       // Fast path.
-      int h = LiteralByteString.hashCode(bytes.capacity(), bytes.array(),
-          bytes.arrayOffset(), bytes.capacity());
+      int h = partialHash(bytes.capacity(), bytes.array(), bytes.arrayOffset(), bytes.capacity());
       return h == 0 ? 1 : h;
     } else {
       // Read the data into a temporary byte array before calculating the
@@ -353,7 +346,7 @@ public class Internal {
         final int length = duplicated.remaining() <= bufferSize ?
             duplicated.remaining() : bufferSize;
         duplicated.get(buffer, 0, length);
-        h = LiteralByteString.hashCode(h, buffer, 0, length);
+        h = partialHash(h, buffer, 0, length);
       }
       return h == 0 ? 1 : h;
     }
@@ -385,7 +378,6 @@ public class Internal {
   public static final CodedInputStream EMPTY_CODED_INPUT_STREAM =
       CodedInputStream.newInstance(EMPTY_BYTE_ARRAY);
 
-
   /**
    * Provides an immutable view of {@code List<T>} around a {@code List<F>}.
    *
diff --git a/java/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java b/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
index 85ce7b24..85ce7b24 100644
--- a/java/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
+++ b/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
diff --git a/java/src/main/java/com/google/protobuf/LazyField.java b/java/core/src/main/java/com/google/protobuf/LazyField.java
index 5e0a485c..5e0a485c 100644
--- a/java/src/main/java/com/google/protobuf/LazyField.java
+++ b/java/core/src/main/java/com/google/protobuf/LazyField.java
diff --git a/java/src/main/java/com/google/protobuf/LazyFieldLite.java b/java/core/src/main/java/com/google/protobuf/LazyFieldLite.java
index eea1fe3c..eea1fe3c 100644
--- a/java/src/main/java/com/google/protobuf/LazyFieldLite.java
+++ b/java/core/src/main/java/com/google/protobuf/LazyFieldLite.java
diff --git a/java/src/main/java/com/google/protobuf/LazyStringArrayList.java b/java/core/src/main/java/com/google/protobuf/LazyStringArrayList.java
index c3be3cca..c3be3cca 100644
--- a/java/src/main/java/com/google/protobuf/LazyStringArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/LazyStringArrayList.java
diff --git a/java/src/main/java/com/google/protobuf/LazyStringList.java b/java/core/src/main/java/com/google/protobuf/LazyStringList.java
index 3eeedca1..3eeedca1 100644
--- a/java/src/main/java/com/google/protobuf/LazyStringList.java
+++ b/java/core/src/main/java/com/google/protobuf/LazyStringList.java
diff --git a/java/src/main/java/com/google/protobuf/LongArrayList.java b/java/core/src/main/java/com/google/protobuf/LongArrayList.java
index ebe62029..ebe62029 100644
--- a/java/src/main/java/com/google/protobuf/LongArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/LongArrayList.java
diff --git a/java/src/main/java/com/google/protobuf/MapEntry.java b/java/core/src/main/java/com/google/protobuf/MapEntry.java
index 31414bb4..31414bb4 100644
--- a/java/src/main/java/com/google/protobuf/MapEntry.java
+++ b/java/core/src/main/java/com/google/protobuf/MapEntry.java
diff --git a/java/src/main/java/com/google/protobuf/MapEntryLite.java b/java/core/src/main/java/com/google/protobuf/MapEntryLite.java
index bcffa946..bcffa946 100644
--- a/java/src/main/java/com/google/protobuf/MapEntryLite.java
+++ b/java/core/src/main/java/com/google/protobuf/MapEntryLite.java
diff --git a/java/src/main/java/com/google/protobuf/MapField.java b/java/core/src/main/java/com/google/protobuf/MapField.java
index b290993c..b290993c 100644
--- a/java/src/main/java/com/google/protobuf/MapField.java
+++ b/java/core/src/main/java/com/google/protobuf/MapField.java
diff --git a/java/src/main/java/com/google/protobuf/MapFieldLite.java b/java/core/src/main/java/com/google/protobuf/MapFieldLite.java
index 16d3e6d2..960b6339 100644
--- a/java/src/main/java/com/google/protobuf/MapFieldLite.java
+++ b/java/core/src/main/java/com/google/protobuf/MapFieldLite.java
@@ -136,7 +136,7 @@ public final class MapFieldLite<K, V> implements MutabilityOracle {
   
   private static int calculateHashCodeForObject(Object a) {
     if (a instanceof byte[]) {
-      return LiteralByteString.hashCode((byte[]) a);
+      return Internal.hashCode((byte[]) a);
     }
     // Enums should be stored as integers internally.
     if (a instanceof EnumLite) {
diff --git a/java/src/main/java/com/google/protobuf/Message.java b/java/core/src/main/java/com/google/protobuf/Message.java
index 9516d71f..9516d71f 100644
--- a/java/src/main/java/com/google/protobuf/Message.java
+++ b/java/core/src/main/java/com/google/protobuf/Message.java
diff --git a/java/src/main/java/com/google/protobuf/MessageLite.java b/java/core/src/main/java/com/google/protobuf/MessageLite.java
index 798b7943..798b7943 100644
--- a/java/src/main/java/com/google/protobuf/MessageLite.java
+++ b/java/core/src/main/java/com/google/protobuf/MessageLite.java
diff --git a/java/src/main/java/com/google/protobuf/MessageLiteOrBuilder.java b/java/core/src/main/java/com/google/protobuf/MessageLiteOrBuilder.java
index 818386ce..818386ce 100644
--- a/java/src/main/java/com/google/protobuf/MessageLiteOrBuilder.java
+++ b/java/core/src/main/java/com/google/protobuf/MessageLiteOrBuilder.java
diff --git a/java/src/main/java/com/google/protobuf/MessageLiteToString.java b/java/core/src/main/java/com/google/protobuf/MessageLiteToString.java
index e69de29b..e69de29b 100644
--- a/java/src/main/java/com/google/protobuf/MessageLiteToString.java
+++ b/java/core/src/main/java/com/google/protobuf/MessageLiteToString.java
diff --git a/java/src/main/java/com/google/protobuf/MessageOrBuilder.java b/java/core/src/main/java/com/google/protobuf/MessageOrBuilder.java
index f0fc4859..f0fc4859 100644
--- a/java/src/main/java/com/google/protobuf/MessageOrBuilder.java
+++ b/java/core/src/main/java/com/google/protobuf/MessageOrBuilder.java
diff --git a/java/src/main/java/com/google/protobuf/MessageReflection.java b/java/core/src/main/java/com/google/protobuf/MessageReflection.java
index de4bfd3e..de4bfd3e 100644
--- a/java/src/main/java/com/google/protobuf/MessageReflection.java
+++ b/java/core/src/main/java/com/google/protobuf/MessageReflection.java
diff --git a/java/src/main/java/com/google/protobuf/MutabilityOracle.java b/java/core/src/main/java/com/google/protobuf/MutabilityOracle.java
index 82b723c9..82b723c9 100644
--- a/java/src/main/java/com/google/protobuf/MutabilityOracle.java
+++ b/java/core/src/main/java/com/google/protobuf/MutabilityOracle.java
diff --git a/java/src/main/java/com/google/protobuf/NioByteString.java b/java/core/src/main/java/com/google/protobuf/NioByteString.java
index f71e41b2..f71e41b2 100644
--- a/java/src/main/java/com/google/protobuf/NioByteString.java
+++ b/java/core/src/main/java/com/google/protobuf/NioByteString.java
diff --git a/java/src/main/java/com/google/protobuf/Parser.java b/java/core/src/main/java/com/google/protobuf/Parser.java
index 3fa11c3b..3fa11c3b 100644
--- a/java/src/main/java/com/google/protobuf/Parser.java
+++ b/java/core/src/main/java/com/google/protobuf/Parser.java
diff --git a/java/src/main/java/com/google/protobuf/ProtobufArrayList.java b/java/core/src/main/java/com/google/protobuf/ProtobufArrayList.java
index d2f82ac5..d2f82ac5 100644
--- a/java/src/main/java/com/google/protobuf/ProtobufArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/ProtobufArrayList.java
diff --git a/java/src/main/java/com/google/protobuf/ProtocolMessageEnum.java b/java/core/src/main/java/com/google/protobuf/ProtocolMessageEnum.java
index 0c8df989..0c8df989 100644
--- a/java/src/main/java/com/google/protobuf/ProtocolMessageEnum.java
+++ b/java/core/src/main/java/com/google/protobuf/ProtocolMessageEnum.java
diff --git a/java/src/main/java/com/google/protobuf/ProtocolStringList.java b/java/core/src/main/java/com/google/protobuf/ProtocolStringList.java
index d553b41e..d553b41e 100644
--- a/java/src/main/java/com/google/protobuf/ProtocolStringList.java
+++ b/java/core/src/main/java/com/google/protobuf/ProtocolStringList.java
diff --git a/java/src/main/java/com/google/protobuf/RepeatedFieldBuilder.java b/java/core/src/main/java/com/google/protobuf/RepeatedFieldBuilder.java
index f91cdbce..f91cdbce 100644
--- a/java/src/main/java/com/google/protobuf/RepeatedFieldBuilder.java
+++ b/java/core/src/main/java/com/google/protobuf/RepeatedFieldBuilder.java
diff --git a/java/src/main/java/com/google/protobuf/RopeByteString.java b/java/core/src/main/java/com/google/protobuf/RopeByteString.java
index 6e8eb724..469c90c2 100644
--- a/java/src/main/java/com/google/protobuf/RopeByteString.java
+++ b/java/core/src/main/java/com/google/protobuf/RopeByteString.java
@@ -213,14 +213,14 @@ final class RopeByteString extends ByteString {
    * @param right string on the right
    * @return string formed by copying data bytes
    */
-  private static LiteralByteString concatenateBytes(ByteString left,
+  private static ByteString concatenateBytes(ByteString left,
       ByteString right) {
     int leftSize = left.size();
     int rightSize = right.size();
     byte[] bytes = new byte[leftSize + rightSize];
     left.copyTo(bytes, 0, 0, leftSize);
     right.copyTo(bytes, 0, leftSize, rightSize);
-    return new LiteralByteString(bytes);  // Constructor wraps bytes
+    return ByteString.wrap(bytes);  // Constructor wraps bytes
   }
 
   /**
@@ -735,7 +735,7 @@ final class RopeByteString extends ByteString {
   private static final long serialVersionUID = 1L;
 
   Object writeReplace() {
-    return new LiteralByteString(toByteArray());
+    return ByteString.wrap(toByteArray());
   }
 
   private void readObject(@SuppressWarnings("unused") ObjectInputStream in) throws IOException {
diff --git a/java/src/main/java/com/google/protobuf/RpcCallback.java b/java/core/src/main/java/com/google/protobuf/RpcCallback.java
index 10752968..10752968 100644
--- a/java/src/main/java/com/google/protobuf/RpcCallback.java
+++ b/java/core/src/main/java/com/google/protobuf/RpcCallback.java
diff --git a/java/src/main/java/com/google/protobuf/RpcChannel.java b/java/core/src/main/java/com/google/protobuf/RpcChannel.java
index f272f4ad..f272f4ad 100644
--- a/java/src/main/java/com/google/protobuf/RpcChannel.java
+++ b/java/core/src/main/java/com/google/protobuf/RpcChannel.java
diff --git a/java/src/main/java/com/google/protobuf/RpcController.java b/java/core/src/main/java/com/google/protobuf/RpcController.java
index a92dd7be..a92dd7be 100644
--- a/java/src/main/java/com/google/protobuf/RpcController.java
+++ b/java/core/src/main/java/com/google/protobuf/RpcController.java
diff --git a/java/src/main/java/com/google/protobuf/RpcUtil.java b/java/core/src/main/java/com/google/protobuf/RpcUtil.java
index 694b8d13..694b8d13 100644
--- a/java/src/main/java/com/google/protobuf/RpcUtil.java
+++ b/java/core/src/main/java/com/google/protobuf/RpcUtil.java
diff --git a/java/src/main/java/com/google/protobuf/Service.java b/java/core/src/main/java/com/google/protobuf/Service.java
index ba7b033e..ba7b033e 100644
--- a/java/src/main/java/com/google/protobuf/Service.java
+++ b/java/core/src/main/java/com/google/protobuf/Service.java
diff --git a/java/src/main/java/com/google/protobuf/ServiceException.java b/java/core/src/main/java/com/google/protobuf/ServiceException.java
index 00d57075..00d57075 100644
--- a/java/src/main/java/com/google/protobuf/ServiceException.java
+++ b/java/core/src/main/java/com/google/protobuf/ServiceException.java
diff --git a/java/src/main/java/com/google/protobuf/SingleFieldBuilder.java b/java/core/src/main/java/com/google/protobuf/SingleFieldBuilder.java
index aba65e32..aba65e32 100644
--- a/java/src/main/java/com/google/protobuf/SingleFieldBuilder.java
+++ b/java/core/src/main/java/com/google/protobuf/SingleFieldBuilder.java
diff --git a/java/src/main/java/com/google/protobuf/SmallSortedMap.java b/java/core/src/main/java/com/google/protobuf/SmallSortedMap.java
index 0674d2e2..0674d2e2 100644
--- a/java/src/main/java/com/google/protobuf/SmallSortedMap.java
+++ b/java/core/src/main/java/com/google/protobuf/SmallSortedMap.java
diff --git a/java/src/main/java/com/google/protobuf/TextFormat.java b/java/core/src/main/java/com/google/protobuf/TextFormat.java
index c99b5285..c99b5285 100644
--- a/java/src/main/java/com/google/protobuf/TextFormat.java
+++ b/java/core/src/main/java/com/google/protobuf/TextFormat.java
diff --git a/java/src/main/java/com/google/protobuf/TextFormatEscaper.java b/java/core/src/main/java/com/google/protobuf/TextFormatEscaper.java
index e69de29b..e69de29b 100644
--- a/java/src/main/java/com/google/protobuf/TextFormatEscaper.java
+++ b/java/core/src/main/java/com/google/protobuf/TextFormatEscaper.java
diff --git a/java/src/main/java/com/google/protobuf/UninitializedMessageException.java b/java/core/src/main/java/com/google/protobuf/UninitializedMessageException.java
index 5714c063..5714c063 100644
--- a/java/src/main/java/com/google/protobuf/UninitializedMessageException.java
+++ b/java/core/src/main/java/com/google/protobuf/UninitializedMessageException.java
diff --git a/java/src/main/java/com/google/protobuf/UnknownFieldSet.java b/java/core/src/main/java/com/google/protobuf/UnknownFieldSet.java
index 7cd2250e..7cd2250e 100644
--- a/java/src/main/java/com/google/protobuf/UnknownFieldSet.java
+++ b/java/core/src/main/java/com/google/protobuf/UnknownFieldSet.java
diff --git a/java/src/main/java/com/google/protobuf/UnknownFieldSetLite.java b/java/core/src/main/java/com/google/protobuf/UnknownFieldSetLite.java
index 435ad4d4..435ad4d4 100644
--- a/java/src/main/java/com/google/protobuf/UnknownFieldSetLite.java
+++ b/java/core/src/main/java/com/google/protobuf/UnknownFieldSetLite.java
diff --git a/java/src/main/java/com/google/protobuf/UnmodifiableLazyStringList.java b/java/core/src/main/java/com/google/protobuf/UnmodifiableLazyStringList.java
index 5257c5a2..5257c5a2 100644
--- a/java/src/main/java/com/google/protobuf/UnmodifiableLazyStringList.java
+++ b/java/core/src/main/java/com/google/protobuf/UnmodifiableLazyStringList.java
diff --git a/java/src/main/java/com/google/protobuf/UnsafeByteStrings.java b/java/core/src/main/java/com/google/protobuf/UnsafeByteOperations.java
index c1997515..8806395c 100644
--- a/java/src/main/java/com/google/protobuf/UnsafeByteStrings.java
+++ b/java/core/src/main/java/com/google/protobuf/UnsafeByteOperations.java
@@ -33,15 +33,18 @@ package com.google.protobuf;
 import java.nio.ByteBuffer;
 
 /**
- * Provides unsafe factory methods for {@link ByteString} instances.
+ * Provides a number of unsafe byte operations to be used by advanced applications with high
+ * performance requirements. These methods are referred to as "unsafe" due to the fact that they
+ * potentially expose the backing buffer of a {@link ByteString} to the application.
  *
  * <p><strong>DISCLAIMER:</strong> The methods in this class should only be called if it is
  * guaranteed that the the buffer backing the {@link ByteString} will never change! Mutation of a
  * {@link ByteString} can lead to unexpected and undesirable consequences in your application,
  * and will likely be difficult to debug. Proceed with caution!
  */
-public final class UnsafeByteStrings {
-  private UnsafeByteStrings() {}
+@ExperimentalApi
+public final class UnsafeByteOperations {
+  private UnsafeByteOperations() {}
 
   /**
    * An unsafe operation that returns a {@link ByteString} that is backed by the provided buffer.
@@ -50,6 +53,11 @@ public final class UnsafeByteStrings {
    * @return a {@link ByteString} backed by the provided buffer.
    */
   public static ByteString unsafeWrap(ByteBuffer buffer) {
-    return new NioByteString(buffer);
+    if (buffer.hasArray()) {
+      final int offset = buffer.arrayOffset();
+      return ByteString.wrap(buffer.array(), offset + buffer.position(), buffer.remaining());
+    } else {
+      return new NioByteString(buffer);
+    }
   }
 }
diff --git a/java/src/main/java/com/google/protobuf/Utf8.java b/java/core/src/main/java/com/google/protobuf/Utf8.java
index 48c7e9e6..48c7e9e6 100644
--- a/java/src/main/java/com/google/protobuf/Utf8.java
+++ b/java/core/src/main/java/com/google/protobuf/Utf8.java
diff --git a/java/src/main/java/com/google/protobuf/WireFormat.java b/java/core/src/main/java/com/google/protobuf/WireFormat.java
index 8dbe1ae3..8dbe1ae3 100644
--- a/java/src/main/java/com/google/protobuf/WireFormat.java
+++ b/java/core/src/main/java/com/google/protobuf/WireFormat.java
diff --git a/java/src/test/java/com/google/protobuf/AbstractMessageTest.java b/java/core/src/test/java/com/google/protobuf/AbstractMessageTest.java
index d964ef59..d964ef59 100644
--- a/java/src/test/java/com/google/protobuf/AbstractMessageTest.java
+++ b/java/core/src/test/java/com/google/protobuf/AbstractMessageTest.java
diff --git a/java/src/test/java/com/google/protobuf/AnyTest.java b/java/core/src/test/java/com/google/protobuf/AnyTest.java
index e169f69d..e169f69d 100644
--- a/java/src/test/java/com/google/protobuf/AnyTest.java
+++ b/java/core/src/test/java/com/google/protobuf/AnyTest.java
diff --git a/java/src/test/java/com/google/protobuf/BooleanArrayListTest.java b/java/core/src/test/java/com/google/protobuf/BooleanArrayListTest.java
index b8ad1fe4..b8ad1fe4 100644
--- a/java/src/test/java/com/google/protobuf/BooleanArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/BooleanArrayListTest.java
diff --git a/java/src/test/java/com/google/protobuf/BoundedByteStringTest.java b/java/core/src/test/java/com/google/protobuf/BoundedByteStringTest.java
index 2dfae2e6..7a8a0a5e 100644
--- a/java/src/test/java/com/google/protobuf/BoundedByteStringTest.java
+++ b/java/core/src/test/java/com/google/protobuf/BoundedByteStringTest.java
@@ -62,7 +62,7 @@ public class BoundedByteStringTest extends LiteralByteStringTest {
   @Override
   public void testToString() throws UnsupportedEncodingException {
     String testString = "I love unicode \u1234\u5678 characters";
-    LiteralByteString unicode = new LiteralByteString(testString.getBytes(Internal.UTF_8));
+    ByteString unicode = ByteString.wrap(testString.getBytes(Internal.UTF_8));
     ByteString chopped = unicode.substring(2, unicode.size() - 6);
     assertEquals(classUnderTest + ".substring() must have the expected type",
         classUnderTest, getActualClassName(chopped));
@@ -75,7 +75,7 @@ public class BoundedByteStringTest extends LiteralByteStringTest {
   @Override
   public void testCharsetToString() {
     String testString = "I love unicode \u1234\u5678 characters";
-    LiteralByteString unicode = new LiteralByteString(testString.getBytes(Internal.UTF_8));
+    ByteString unicode = ByteString.wrap(testString.getBytes(Internal.UTF_8));
     ByteString chopped = unicode.substring(2, unicode.size() - 6);
     assertEquals(classUnderTest + ".substring() must have the expected type",
         classUnderTest, getActualClassName(chopped));
diff --git a/java/src/test/java/com/google/protobuf/ByteStringTest.java b/java/core/src/test/java/com/google/protobuf/ByteStringTest.java
index 36f64251..5267c160 100644
--- a/java/src/test/java/com/google/protobuf/ByteStringTest.java
+++ b/java/core/src/test/java/com/google/protobuf/ByteStringTest.java
@@ -655,11 +655,11 @@ public class ByteStringTest extends TestCase {
     // trees of empty leaves, to make a string that will fail this test.
     for (int i = 1; i < duo.size(); ++i) {
       assertTrue("Substrings of size() < 2 must not be RopeByteStrings",
-          duo.substring(i - 1, i) instanceof LiteralByteString);
+          duo.substring(i - 1, i) instanceof ByteString.LeafByteString);
     }
     for (int i = 1; i < quintet.size(); ++i) {
       assertTrue("Substrings of size() < 2 must not be RopeByteStrings",
-          quintet.substring(i - 1, i) instanceof LiteralByteString);
+          quintet.substring(i - 1, i) instanceof ByteString.LeafByteString);
     }
   }
 
@@ -724,7 +724,7 @@ public class ByteStringTest extends TestCase {
     }
     data1[1] = (byte) 11;
     // Test LiteralByteString.writeTo(OutputStream,int,int)
-    LiteralByteString left = new LiteralByteString(data1);
+    ByteString left = ByteString.wrap(data1);
     byte[] result = substringUsingWriteTo(left, 1, 1);
     assertEquals(1, result.length);
     assertEquals((byte) 11, result[0]);
@@ -733,7 +733,7 @@ public class ByteStringTest extends TestCase {
     for (int i = 0; i < data1.length; i++) {
       data2[i] = (byte) 2;
     }
-    LiteralByteString right = new LiteralByteString(data2);
+    ByteString right = ByteString.wrap(data2);
     // Concatenate two ByteStrings to create a RopeByteString.
     ByteString root = left.concat(right);
     // Make sure we are actually testing a RopeByteString with a simple tree
diff --git a/java/src/test/java/com/google/protobuf/CheckUtf8Test.java b/java/core/src/test/java/com/google/protobuf/CheckUtf8Test.java
index 3d6381c9..3d6381c9 100644
--- a/java/src/test/java/com/google/protobuf/CheckUtf8Test.java
+++ b/java/core/src/test/java/com/google/protobuf/CheckUtf8Test.java
diff --git a/java/src/test/java/com/google/protobuf/CodedInputStreamTest.java b/java/core/src/test/java/com/google/protobuf/CodedInputStreamTest.java
index 18d8142c..18d8142c 100644
--- a/java/src/test/java/com/google/protobuf/CodedInputStreamTest.java
+++ b/java/core/src/test/java/com/google/protobuf/CodedInputStreamTest.java
diff --git a/java/src/test/java/com/google/protobuf/CodedOutputStreamTest.java b/java/core/src/test/java/com/google/protobuf/CodedOutputStreamTest.java
index 6018ea55..6018ea55 100644
--- a/java/src/test/java/com/google/protobuf/CodedOutputStreamTest.java
+++ b/java/core/src/test/java/com/google/protobuf/CodedOutputStreamTest.java
diff --git a/java/src/test/java/com/google/protobuf/DeprecatedFieldTest.java b/java/core/src/test/java/com/google/protobuf/DeprecatedFieldTest.java
index e7905f79..e7905f79 100644
--- a/java/src/test/java/com/google/protobuf/DeprecatedFieldTest.java
+++ b/java/core/src/test/java/com/google/protobuf/DeprecatedFieldTest.java
diff --git a/java/src/test/java/com/google/protobuf/DescriptorsTest.java b/java/core/src/test/java/com/google/protobuf/DescriptorsTest.java
index 82ff34af..82ff34af 100644
--- a/java/src/test/java/com/google/protobuf/DescriptorsTest.java
+++ b/java/core/src/test/java/com/google/protobuf/DescriptorsTest.java
diff --git a/java/src/test/java/com/google/protobuf/DoubleArrayListTest.java b/java/core/src/test/java/com/google/protobuf/DoubleArrayListTest.java
index d3deaa07..d3deaa07 100644
--- a/java/src/test/java/com/google/protobuf/DoubleArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/DoubleArrayListTest.java
diff --git a/java/src/test/java/com/google/protobuf/DynamicMessageTest.java b/java/core/src/test/java/com/google/protobuf/DynamicMessageTest.java
index 55144e7c..55144e7c 100644
--- a/java/src/test/java/com/google/protobuf/DynamicMessageTest.java
+++ b/java/core/src/test/java/com/google/protobuf/DynamicMessageTest.java
diff --git a/java/src/test/java/com/google/protobuf/FieldPresenceTest.java b/java/core/src/test/java/com/google/protobuf/FieldPresenceTest.java
index eaeec0b8..eaeec0b8 100644
--- a/java/src/test/java/com/google/protobuf/FieldPresenceTest.java
+++ b/java/core/src/test/java/com/google/protobuf/FieldPresenceTest.java
diff --git a/java/src/test/java/com/google/protobuf/FloatArrayListTest.java b/java/core/src/test/java/com/google/protobuf/FloatArrayListTest.java
index a5e65424..a5e65424 100644
--- a/java/src/test/java/com/google/protobuf/FloatArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/FloatArrayListTest.java
diff --git a/java/src/test/java/com/google/protobuf/ForceFieldBuildersPreRun.java b/java/core/src/test/java/com/google/protobuf/ForceFieldBuildersPreRun.java
index a92ba374..a92ba374 100644
--- a/java/src/test/java/com/google/protobuf/ForceFieldBuildersPreRun.java
+++ b/java/core/src/test/java/com/google/protobuf/ForceFieldBuildersPreRun.java
diff --git a/java/src/test/java/com/google/protobuf/GeneratedMessageTest.java b/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java
index 70812b95..70812b95 100644
--- a/java/src/test/java/com/google/protobuf/GeneratedMessageTest.java
+++ b/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java
diff --git a/java/src/test/java/com/google/protobuf/IntArrayListTest.java b/java/core/src/test/java/com/google/protobuf/IntArrayListTest.java
index 3733eb30..3733eb30 100644
--- a/java/src/test/java/com/google/protobuf/IntArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/IntArrayListTest.java
diff --git a/java/src/test/java/com/google/protobuf/IsValidUtf8Test.java b/java/core/src/test/java/com/google/protobuf/IsValidUtf8Test.java
index 8751baae..8751baae 100644
--- a/java/src/test/java/com/google/protobuf/IsValidUtf8Test.java
+++ b/java/core/src/test/java/com/google/protobuf/IsValidUtf8Test.java
diff --git a/java/src/test/java/com/google/protobuf/IsValidUtf8TestUtil.java b/java/core/src/test/java/com/google/protobuf/IsValidUtf8TestUtil.java
index 321669f3..321669f3 100644
--- a/java/src/test/java/com/google/protobuf/IsValidUtf8TestUtil.java
+++ b/java/core/src/test/java/com/google/protobuf/IsValidUtf8TestUtil.java
diff --git a/java/src/test/java/com/google/protobuf/LazyFieldLiteTest.java b/java/core/src/test/java/com/google/protobuf/LazyFieldLiteTest.java
index 211b5697..211b5697 100644
--- a/java/src/test/java/com/google/protobuf/LazyFieldLiteTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LazyFieldLiteTest.java
diff --git a/java/src/test/java/com/google/protobuf/LazyFieldTest.java b/java/core/src/test/java/com/google/protobuf/LazyFieldTest.java
index 2b900065..2b900065 100644
--- a/java/src/test/java/com/google/protobuf/LazyFieldTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LazyFieldTest.java
diff --git a/java/src/test/java/com/google/protobuf/LazyMessageLiteTest.java b/java/core/src/test/java/com/google/protobuf/LazyMessageLiteTest.java
index afe0fffd..afe0fffd 100644
--- a/java/src/test/java/com/google/protobuf/LazyMessageLiteTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LazyMessageLiteTest.java
diff --git a/java/src/test/java/com/google/protobuf/LazyStringArrayListTest.java b/java/core/src/test/java/com/google/protobuf/LazyStringArrayListTest.java
index 0f42ac50..0f42ac50 100644
--- a/java/src/test/java/com/google/protobuf/LazyStringArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LazyStringArrayListTest.java
diff --git a/java/src/test/java/com/google/protobuf/LazyStringEndToEndTest.java b/java/core/src/test/java/com/google/protobuf/LazyStringEndToEndTest.java
index 0ef414aa..0ef414aa 100644
--- a/java/src/test/java/com/google/protobuf/LazyStringEndToEndTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LazyStringEndToEndTest.java
diff --git a/java/src/test/java/com/google/protobuf/LiteEqualsAndHashTest.java b/java/core/src/test/java/com/google/protobuf/LiteEqualsAndHashTest.java
index 035917c8..035917c8 100644
--- a/java/src/test/java/com/google/protobuf/LiteEqualsAndHashTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LiteEqualsAndHashTest.java
diff --git a/java/src/test/java/com/google/protobuf/LiteTest.java b/java/core/src/test/java/com/google/protobuf/LiteTest.java
index b1f298ff..b1f298ff 100644
--- a/java/src/test/java/com/google/protobuf/LiteTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LiteTest.java
diff --git a/java/src/test/java/com/google/protobuf/LiteralByteStringTest.java b/java/core/src/test/java/com/google/protobuf/LiteralByteStringTest.java
index c8495633..68b55ceb 100644
--- a/java/src/test/java/com/google/protobuf/LiteralByteStringTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LiteralByteStringTest.java
@@ -75,9 +75,7 @@ public class LiteralByteStringTest extends TestCase {
   }
 
   protected String getActualClassName(Object object) {
-    String actualClassName = object.getClass().getName();
-    actualClassName = actualClassName.substring(actualClassName.lastIndexOf('.') + 1);
-    return actualClassName;
+    return object.getClass().getSimpleName();
   }
 
   public void testByteAt() {
@@ -350,14 +348,14 @@ public class LiteralByteStringTest extends TestCase {
 
   public void testToString() throws UnsupportedEncodingException {
     String testString = "I love unicode \u1234\u5678 characters";
-    LiteralByteString unicode = new LiteralByteString(testString.getBytes(Internal.UTF_8));
+    ByteString unicode = ByteString.wrap(testString.getBytes(Internal.UTF_8));
     String roundTripString = unicode.toString(UTF_8);
     assertEquals(classUnderTest + " unicode must match", testString, roundTripString);
   }
 
   public void testCharsetToString() {
     String testString = "I love unicode \u1234\u5678 characters";
-    LiteralByteString unicode = new LiteralByteString(testString.getBytes(Internal.UTF_8));
+    ByteString unicode = ByteString.wrap(testString.getBytes(Internal.UTF_8));
     String roundTripString = unicode.toString(Internal.UTF_8);
     assertEquals(classUnderTest + " unicode must match", testString, roundTripString);
   }
@@ -365,7 +363,7 @@ public class LiteralByteStringTest extends TestCase {
   public void testToString_returnsCanonicalEmptyString() {
     assertSame(classUnderTest + " must be the same string references",
         ByteString.EMPTY.toString(Internal.UTF_8),
-        new LiteralByteString(new byte[]{}).toString(Internal.UTF_8));
+        ByteString.wrap(new byte[]{}).toString(Internal.UTF_8));
   }
 
   public void testToString_raisesException() {
@@ -377,7 +375,7 @@ public class LiteralByteStringTest extends TestCase {
     }
 
     try {
-      new LiteralByteString(referenceBytes).toString("invalid");
+      ByteString.wrap(referenceBytes).toString("invalid");
       fail("Should have thrown an exception.");
     } catch (UnsupportedEncodingException expected) {
       // This is success
@@ -390,15 +388,15 @@ public class LiteralByteStringTest extends TestCase {
     assertFalse(classUnderTest + " must not equal the empty string",
         stringUnderTest.equals(ByteString.EMPTY));
     assertEquals(classUnderTest + " empty strings must be equal",
-        new LiteralByteString(new byte[]{}), stringUnderTest.substring(55, 55));
+        ByteString.wrap(new byte[]{}), stringUnderTest.substring(55, 55));
     assertEquals(classUnderTest + " must equal another string with the same value",
-        stringUnderTest, new LiteralByteString(referenceBytes));
+        stringUnderTest, ByteString.wrap(referenceBytes));
 
     byte[] mungedBytes = new byte[referenceBytes.length];
     System.arraycopy(referenceBytes, 0, mungedBytes, 0, referenceBytes.length);
     mungedBytes[mungedBytes.length - 5] = (byte) (mungedBytes[mungedBytes.length - 5] ^ 0xFF);
     assertFalse(classUnderTest + " must not equal every string with the same length",
-        stringUnderTest.equals(new LiteralByteString(mungedBytes)));
+        stringUnderTest.equals(ByteString.wrap(mungedBytes)));
   }
 
   public void testHashCode() {
diff --git a/java/src/test/java/com/google/protobuf/LongArrayListTest.java b/java/core/src/test/java/com/google/protobuf/LongArrayListTest.java
index 1bd094f7..1bd094f7 100644
--- a/java/src/test/java/com/google/protobuf/LongArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LongArrayListTest.java
diff --git a/java/src/test/java/com/google/protobuf/MapForProto2LiteTest.java b/java/core/src/test/java/com/google/protobuf/MapForProto2LiteTest.java
index 3d8c9bc4..3d8c9bc4 100644
--- a/java/src/test/java/com/google/protobuf/MapForProto2LiteTest.java
+++ b/java/core/src/test/java/com/google/protobuf/MapForProto2LiteTest.java
diff --git a/java/src/test/java/com/google/protobuf/MapForProto2Test.java b/java/core/src/test/java/com/google/protobuf/MapForProto2Test.java
index 1fa3cbdb..1fa3cbdb 100644
--- a/java/src/test/java/com/google/protobuf/MapForProto2Test.java
+++ b/java/core/src/test/java/com/google/protobuf/MapForProto2Test.java
diff --git a/java/src/test/java/com/google/protobuf/MapTest.java b/java/core/src/test/java/com/google/protobuf/MapTest.java
index 0e5c1284..0e5c1284 100644
--- a/java/src/test/java/com/google/protobuf/MapTest.java
+++ b/java/core/src/test/java/com/google/protobuf/MapTest.java
diff --git a/java/src/test/java/com/google/protobuf/MessageTest.java b/java/core/src/test/java/com/google/protobuf/MessageTest.java
index abcd3a1d..abcd3a1d 100644
--- a/java/src/test/java/com/google/protobuf/MessageTest.java
+++ b/java/core/src/test/java/com/google/protobuf/MessageTest.java
diff --git a/java/src/test/java/com/google/protobuf/NestedBuildersTest.java b/java/core/src/test/java/com/google/protobuf/NestedBuildersTest.java
index 23653126..23653126 100644
--- a/java/src/test/java/com/google/protobuf/NestedBuildersTest.java
+++ b/java/core/src/test/java/com/google/protobuf/NestedBuildersTest.java
diff --git a/java/src/test/java/com/google/protobuf/NioByteStringTest.java b/java/core/src/test/java/com/google/protobuf/NioByteStringTest.java
index 0679937f..e40a3662 100644
--- a/java/src/test/java/com/google/protobuf/NioByteStringTest.java
+++ b/java/core/src/test/java/com/google/protobuf/NioByteStringTest.java
@@ -52,13 +52,12 @@ import java.util.NoSuchElementException;
  * Tests for {@link NioByteString}.
  */
 public class NioByteStringTest extends TestCase {
-  private static final ByteString EMPTY = UnsafeByteStrings.unsafeWrap(
-      ByteBuffer.wrap(new byte[0]));
+  private static final ByteString EMPTY = new NioByteString(ByteBuffer.wrap(new byte[0]));
   private static final String CLASSNAME = NioByteString.class.getSimpleName();
   private static final byte[] BYTES = ByteStringTest.getTestBytes(1234, 11337766L);
-  private static final int EXPECTED_HASH = new LiteralByteString(BYTES).hashCode();
+  private static final int EXPECTED_HASH = ByteString.wrap(BYTES).hashCode();
   private static final ByteBuffer BUFFER = ByteBuffer.wrap(BYTES.clone());
-  private static final ByteString TEST_STRING = UnsafeByteStrings.unsafeWrap(BUFFER);
+  private static final ByteString TEST_STRING = new NioByteString(BUFFER);
 
   public void testExpectedType() {
     String actualClassName = getActualClassName(TEST_STRING);
@@ -362,7 +361,7 @@ public class NioByteStringTest extends TestCase {
   public void testToString_returnsCanonicalEmptyString() {
     assertSame(CLASSNAME + " must be the same string references",
         EMPTY.toString(UTF_8),
-        UnsafeByteStrings.unsafeWrap(ByteBuffer.wrap(new byte[0])).toString(UTF_8));
+        new NioByteString(ByteBuffer.wrap(new byte[0])).toString(UTF_8));
   }
 
   public void testToString_raisesException() {
@@ -389,11 +388,11 @@ public class NioByteStringTest extends TestCase {
     assertEquals(CLASSNAME + " empty strings must be equal",
         EMPTY, TEST_STRING.substring(55, 55));
     assertEquals(CLASSNAME + " must equal another string with the same value",
-        TEST_STRING, UnsafeByteStrings.unsafeWrap(BUFFER));
+        TEST_STRING, new NioByteString(BUFFER));
 
     byte[] mungedBytes = mungedBytes();
     assertFalse(CLASSNAME + " must not equal every string with the same length",
-        TEST_STRING.equals(UnsafeByteStrings.unsafeWrap(ByteBuffer.wrap(mungedBytes))));
+        TEST_STRING.equals(new NioByteString(ByteBuffer.wrap(mungedBytes))));
   }
 
   public void testEqualsLiteralByteString() {
@@ -451,7 +450,7 @@ public class NioByteStringTest extends TestCase {
   }
 
   public void testPeekCachedHashCode() {
-    ByteString newString = UnsafeByteStrings.unsafeWrap(BUFFER);
+    ByteString newString = new NioByteString(BUFFER);
     assertEquals(CLASSNAME + ".peekCachedHashCode() should return zero at first", 0,
         newString.peekCachedHashCode());
     newString.hashCode();
@@ -541,6 +540,6 @@ public class NioByteStringTest extends TestCase {
   }
 
   private static ByteString forString(String str) {
-    return UnsafeByteStrings.unsafeWrap(ByteBuffer.wrap(str.getBytes(UTF_8)));
+    return new NioByteString(ByteBuffer.wrap(str.getBytes(UTF_8)));
   }
 }
diff --git a/java/core/src/test/java/com/google/protobuf/ParseExceptionsTest.java b/java/core/src/test/java/com/google/protobuf/ParseExceptionsTest.java
new file mode 100644
index 00000000..03593413
--- /dev/null
+++ b/java/core/src/test/java/com/google/protobuf/ParseExceptionsTest.java
@@ -0,0 +1,212 @@
+package com.google.protobuf;
+
+import com.google.protobuf.DescriptorProtos.DescriptorProto;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+/**
+ * Tests the exceptions thrown when parsing from a stream. The methods on the {@link Parser}
+ * interface are specified to only throw {@link InvalidProtocolBufferException}. But we really want
+ * to distinguish between invalid protos vs. actual I/O errors (like failures reading from a
+ * socket, etc.). So, when we're not using the parser directly, an {@link IOException} should be
+ * thrown where appropriate, instead of always an {@link InvalidProtocolBufferException}.
+ *
+ * @author jh@squareup.com (Joshua Humphries)
+ */
+public class ParseExceptionsTest {
+
+// disable for now for update the maven local repo.
+//   private interface ParseTester {
+//     DescriptorProto parse(InputStream in) throws IOException;
+//   }
+// 
+//   private byte serializedProto[];
+// 
+//   private void setup() {
+//     serializedProto = DescriptorProto.getDescriptor().toProto().toByteArray();
+//   }
+// 
+//   private void setupDelimited() {
+//     ByteArrayOutputStream bos = new ByteArrayOutputStream();
+//     try {
+//       DescriptorProto.getDescriptor().toProto().writeDelimitedTo(bos);
+//     } catch (IOException e) {
+//       fail("Exception not expected: " + e);
+//     }
+//     serializedProto = bos.toByteArray();
+//   }
+// 
+//   @Test public void message_parseFrom_InputStream() {
+//     setup();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         return DescriptorProto.parseFrom(in);
+//       }
+//     });
+//   }
+// 
+//   @Test public void message_parseFrom_InputStreamAndExtensionRegistry() {
+//     setup();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         return DescriptorProto.parseFrom(in, ExtensionRegistry.newInstance());
+//       }
+//     });
+//   }
+// 
+//   @Test public void message_parseFrom_CodedInputStream() {
+//     setup();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         return DescriptorProto.parseFrom(CodedInputStream.newInstance(in));
+//       }
+//     });
+//   }
+// 
+//   @Test public void message_parseFrom_CodedInputStreamAndExtensionRegistry() {
+//     setup();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         return DescriptorProto.parseFrom(CodedInputStream.newInstance(in),
+//             ExtensionRegistry.newInstance());
+//       }
+//     });
+//   }
+// 
+//   @Test public void message_parseDelimitedFrom_InputStream() {
+//     setupDelimited();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         return DescriptorProto.parseDelimitedFrom(in);
+//       }
+//     });
+//   }
+// 
+//   @Test public void message_parseDelimitedFrom_InputStreamAndExtensionRegistry() {
+//     setupDelimited();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         return DescriptorProto.parseDelimitedFrom(in, ExtensionRegistry.newInstance());
+//       }
+//     });
+//   }
+// 
+//   @Test public void messageBuilder_mergeFrom_InputStream() {
+//     setup();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         return DescriptorProto.newBuilder().mergeFrom(in).build();
+//       }
+//     });
+//   }
+// 
+//   @Test public void messageBuilder_mergeFrom_InputStreamAndExtensionRegistry() {
+//     setup();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         return DescriptorProto.newBuilder().mergeFrom(in, ExtensionRegistry.newInstance()).build();
+//       }
+//     });
+//   }
+// 
+//   @Test public void messageBuilder_mergeFrom_CodedInputStream() {
+//     setup();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         return DescriptorProto.newBuilder().mergeFrom(CodedInputStream.newInstance(in)).build();
+//       }
+//     });
+//   }
+// 
+//   @Test public void messageBuilder_mergeFrom_CodedInputStreamAndExtensionRegistry() {
+//     setup();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         return DescriptorProto.newBuilder()
+//             .mergeFrom(CodedInputStream.newInstance(in), ExtensionRegistry.newInstance()).build();
+//       }
+//     });
+//   }
+// 
+//   @Test public void messageBuilder_mergeDelimitedFrom_InputStream() {
+//     setupDelimited();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         DescriptorProto.Builder builder = DescriptorProto.newBuilder();
+//         builder.mergeDelimitedFrom(in);
+//         return builder.build();
+//       }
+//     });
+//   }
+// 
+//   @Test public void messageBuilder_mergeDelimitedFrom_InputStreamAndExtensionRegistry() {
+//     setupDelimited();
+//     verifyExceptions(new ParseTester() {
+//       public DescriptorProto parse(InputStream in) throws IOException {
+//         DescriptorProto.Builder builder = DescriptorProto.newBuilder();
+//         builder.mergeDelimitedFrom(in, ExtensionRegistry.newInstance());
+//         return builder.build();
+//       }
+//     });
+//   }
+// 
+//   private void verifyExceptions(ParseTester parseTester) {
+//     // No exception
+//     try {
+//       assertEquals(DescriptorProto.getDescriptor().toProto(),
+//           parseTester.parse(new ByteArrayInputStream(serializedProto)));
+//     } catch (IOException e) {
+//       fail("No exception expected: " + e);
+//     }
+// 
+//     // IOException
+//     try {
+//       // using a "broken" stream that will throw part-way through reading the message
+//       parseTester.parse(broken(new ByteArrayInputStream(serializedProto)));
+//       fail("IOException expected but not thrown");
+//     } catch (IOException e) {
+//       assertFalse(e instanceof InvalidProtocolBufferException);
+//     }
+// 
+//     // InvalidProtocolBufferException
+//     try {
+//       // make the serialized proto invalid
+//       for (int i = 0; i < 50; i++) {
+//         serializedProto[i] = -1;
+//       }
+//       parseTester.parse(new ByteArrayInputStream(serializedProto));
+//       fail("InvalidProtocolBufferException expected but not thrown");
+//     } catch (IOException e) {
+//       assertTrue(e instanceof InvalidProtocolBufferException);
+//     }
+//   }
+// 
+//   private InputStream broken(InputStream i) {
+//     return new FilterInputStream(i) {
+//       int count = 0;
+// 
+//       @Override public int read() throws IOException {
+//         if (count++ >= 50) {
+//           throw new IOException("I'm broken!");
+//         }
+//         return super.read();
+//       }
+// 
+//       @Override public int read(byte b[], int off, int len) throws IOException {
+//         if ((count += len) >= 50) {
+//           throw new IOException("I'm broken!");
+//         }
+//         return super.read(b, off, len);
+//       }
+//     };
+//   }
+}
diff --git a/java/src/test/java/com/google/protobuf/ParserTest.java b/java/core/src/test/java/com/google/protobuf/ParserTest.java
index 5a92bacf..5a92bacf 100644
--- a/java/src/test/java/com/google/protobuf/ParserTest.java
+++ b/java/core/src/test/java/com/google/protobuf/ParserTest.java
diff --git a/java/src/test/java/com/google/protobuf/ProtobufArrayListTest.java b/java/core/src/test/java/com/google/protobuf/ProtobufArrayListTest.java
index 245c3dee..245c3dee 100644
--- a/java/src/test/java/com/google/protobuf/ProtobufArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/ProtobufArrayListTest.java
diff --git a/java/src/test/java/com/google/protobuf/RepeatedFieldBuilderTest.java b/java/core/src/test/java/com/google/protobuf/RepeatedFieldBuilderTest.java
index 49d52321..49d52321 100644
--- a/java/src/test/java/com/google/protobuf/RepeatedFieldBuilderTest.java
+++ b/java/core/src/test/java/com/google/protobuf/RepeatedFieldBuilderTest.java
diff --git a/java/src/test/java/com/google/protobuf/RopeByteStringSubstringTest.java b/java/core/src/test/java/com/google/protobuf/RopeByteStringSubstringTest.java
index dc56f2e9..dc56f2e9 100644
--- a/java/src/test/java/com/google/protobuf/RopeByteStringSubstringTest.java
+++ b/java/core/src/test/java/com/google/protobuf/RopeByteStringSubstringTest.java
diff --git a/java/src/test/java/com/google/protobuf/RopeByteStringTest.java b/java/core/src/test/java/com/google/protobuf/RopeByteStringTest.java
index 4ec3a409..4ec3a409 100644
--- a/java/src/test/java/com/google/protobuf/RopeByteStringTest.java
+++ b/java/core/src/test/java/com/google/protobuf/RopeByteStringTest.java
diff --git a/java/src/test/java/com/google/protobuf/ServiceTest.java b/java/core/src/test/java/com/google/protobuf/ServiceTest.java
index ff980d66..ff980d66 100644
--- a/java/src/test/java/com/google/protobuf/ServiceTest.java
+++ b/java/core/src/test/java/com/google/protobuf/ServiceTest.java
diff --git a/java/src/test/java/com/google/protobuf/SingleFieldBuilderTest.java b/java/core/src/test/java/com/google/protobuf/SingleFieldBuilderTest.java
index 58b80007..58b80007 100644
--- a/java/src/test/java/com/google/protobuf/SingleFieldBuilderTest.java
+++ b/java/core/src/test/java/com/google/protobuf/SingleFieldBuilderTest.java
diff --git a/java/src/test/java/com/google/protobuf/SmallSortedMapTest.java b/java/core/src/test/java/com/google/protobuf/SmallSortedMapTest.java
index 366086d3..366086d3 100644
--- a/java/src/test/java/com/google/protobuf/SmallSortedMapTest.java
+++ b/java/core/src/test/java/com/google/protobuf/SmallSortedMapTest.java
diff --git a/java/src/test/java/com/google/protobuf/TestBadIdentifiers.java b/java/core/src/test/java/com/google/protobuf/TestBadIdentifiers.java
index 2c60fe0e..2c60fe0e 100644
--- a/java/src/test/java/com/google/protobuf/TestBadIdentifiers.java
+++ b/java/core/src/test/java/com/google/protobuf/TestBadIdentifiers.java
diff --git a/java/src/test/java/com/google/protobuf/TestUtil.java b/java/core/src/test/java/com/google/protobuf/TestUtil.java
index 01acb884..01acb884 100644
--- a/java/src/test/java/com/google/protobuf/TestUtil.java
+++ b/java/core/src/test/java/com/google/protobuf/TestUtil.java
diff --git a/java/src/test/java/com/google/protobuf/TextFormatTest.java b/java/core/src/test/java/com/google/protobuf/TextFormatTest.java
index 1df4fad7..1df4fad7 100644
--- a/java/src/test/java/com/google/protobuf/TextFormatTest.java
+++ b/java/core/src/test/java/com/google/protobuf/TextFormatTest.java
diff --git a/java/src/test/java/com/google/protobuf/UnknownEnumValueTest.java b/java/core/src/test/java/com/google/protobuf/UnknownEnumValueTest.java
index 8f45976f..8f45976f 100644
--- a/java/src/test/java/com/google/protobuf/UnknownEnumValueTest.java
+++ b/java/core/src/test/java/com/google/protobuf/UnknownEnumValueTest.java
diff --git a/java/src/test/java/com/google/protobuf/UnknownFieldSetLiteTest.java b/java/core/src/test/java/com/google/protobuf/UnknownFieldSetLiteTest.java
index dc987379..dc987379 100644
--- a/java/src/test/java/com/google/protobuf/UnknownFieldSetLiteTest.java
+++ b/java/core/src/test/java/com/google/protobuf/UnknownFieldSetLiteTest.java
diff --git a/java/src/test/java/com/google/protobuf/UnknownFieldSetTest.java b/java/core/src/test/java/com/google/protobuf/UnknownFieldSetTest.java
index 8c9dcafe..8c9dcafe 100644
--- a/java/src/test/java/com/google/protobuf/UnknownFieldSetTest.java
+++ b/java/core/src/test/java/com/google/protobuf/UnknownFieldSetTest.java
diff --git a/java/src/test/java/com/google/protobuf/UnmodifiableLazyStringListTest.java b/java/core/src/test/java/com/google/protobuf/UnmodifiableLazyStringListTest.java
index b1c75fc3..b1c75fc3 100644
--- a/java/src/test/java/com/google/protobuf/UnmodifiableLazyStringListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/UnmodifiableLazyStringListTest.java
diff --git a/java/src/test/java/com/google/protobuf/WellKnownTypesTest.java b/java/core/src/test/java/com/google/protobuf/WellKnownTypesTest.java
index 982e200f..982e200f 100644
--- a/java/src/test/java/com/google/protobuf/WellKnownTypesTest.java
+++ b/java/core/src/test/java/com/google/protobuf/WellKnownTypesTest.java
diff --git a/java/src/test/java/com/google/protobuf/WireFormatTest.java b/java/core/src/test/java/com/google/protobuf/WireFormatTest.java
index 0175005d..0175005d 100644
--- a/java/src/test/java/com/google/protobuf/WireFormatTest.java
+++ b/java/core/src/test/java/com/google/protobuf/WireFormatTest.java
diff --git a/java/src/test/java/com/google/protobuf/any_test.proto b/java/core/src/test/proto/com/google/protobuf/any_test.proto
index 80173d8a..80173d8a 100644
--- a/java/src/test/java/com/google/protobuf/any_test.proto
+++ b/java/core/src/test/proto/com/google/protobuf/any_test.proto
diff --git a/java/src/test/java/com/google/protobuf/field_presence_test.proto b/java/core/src/test/proto/com/google/protobuf/field_presence_test.proto
index 8f3ca8c6..8f3ca8c6 100644
--- a/java/src/test/java/com/google/protobuf/field_presence_test.proto
+++ b/java/core/src/test/proto/com/google/protobuf/field_presence_test.proto
diff --git a/java/src/test/java/com/google/protobuf/lazy_fields_lite.proto b/java/core/src/test/proto/com/google/protobuf/lazy_fields_lite.proto
index 5580f72d..5580f72d 100644
--- a/java/src/test/java/com/google/protobuf/lazy_fields_lite.proto
+++ b/java/core/src/test/proto/com/google/protobuf/lazy_fields_lite.proto
diff --git a/java/src/test/java/com/google/protobuf/lite_equals_and_hash.proto b/java/core/src/test/proto/com/google/protobuf/lite_equals_and_hash.proto
index 86837250..86837250 100644
--- a/java/src/test/java/com/google/protobuf/lite_equals_and_hash.proto
+++ b/java/core/src/test/proto/com/google/protobuf/lite_equals_and_hash.proto
diff --git a/java/src/test/java/com/google/protobuf/map_for_proto2_lite_test.proto b/java/core/src/test/proto/com/google/protobuf/map_for_proto2_lite_test.proto
index d5418f28..d5418f28 100644
--- a/java/src/test/java/com/google/protobuf/map_for_proto2_lite_test.proto
+++ b/java/core/src/test/proto/com/google/protobuf/map_for_proto2_lite_test.proto
diff --git a/java/src/test/java/com/google/protobuf/map_for_proto2_test.proto b/java/core/src/test/proto/com/google/protobuf/map_for_proto2_test.proto
index a9be5166..a9be5166 100644
--- a/java/src/test/java/com/google/protobuf/map_for_proto2_test.proto
+++ b/java/core/src/test/proto/com/google/protobuf/map_for_proto2_test.proto
diff --git a/java/src/test/java/com/google/protobuf/map_initialization_order_test.proto b/java/core/src/test/proto/com/google/protobuf/map_initialization_order_test.proto
index b02ac599..b02ac599 100644
--- a/java/src/test/java/com/google/protobuf/map_initialization_order_test.proto
+++ b/java/core/src/test/proto/com/google/protobuf/map_initialization_order_test.proto
diff --git a/java/src/test/java/com/google/protobuf/map_test.proto b/java/core/src/test/proto/com/google/protobuf/map_test.proto
index 2280ac03..2280ac03 100644
--- a/java/src/test/java/com/google/protobuf/map_test.proto
+++ b/java/core/src/test/proto/com/google/protobuf/map_test.proto
diff --git a/java/src/test/java/com/google/protobuf/multiple_files_test.proto b/java/core/src/test/proto/com/google/protobuf/multiple_files_test.proto
index 92790506..92790506 100644
--- a/java/src/test/java/com/google/protobuf/multiple_files_test.proto
+++ b/java/core/src/test/proto/com/google/protobuf/multiple_files_test.proto
diff --git a/java/src/test/java/com/google/protobuf/nested_builders_test.proto b/java/core/src/test/proto/com/google/protobuf/nested_builders_test.proto
index a5dd66d8..a5dd66d8 100644
--- a/java/src/test/java/com/google/protobuf/nested_builders_test.proto
+++ b/java/core/src/test/proto/com/google/protobuf/nested_builders_test.proto
diff --git a/java/src/test/java/com/google/protobuf/nested_extension.proto b/java/core/src/test/proto/com/google/protobuf/nested_extension.proto
index 704e649e..704e649e 100644
--- a/java/src/test/java/com/google/protobuf/nested_extension.proto
+++ b/java/core/src/test/proto/com/google/protobuf/nested_extension.proto
diff --git a/java/src/test/java/com/google/protobuf/nested_extension_lite.proto b/java/core/src/test/proto/com/google/protobuf/nested_extension_lite.proto
index a95c38b2..a95c38b2 100644
--- a/java/src/test/java/com/google/protobuf/nested_extension_lite.proto
+++ b/java/core/src/test/proto/com/google/protobuf/nested_extension_lite.proto
diff --git a/java/src/test/java/com/google/protobuf/non_nested_extension.proto b/java/core/src/test/proto/com/google/protobuf/non_nested_extension.proto
index 31fac552..31fac552 100644
--- a/java/src/test/java/com/google/protobuf/non_nested_extension.proto
+++ b/java/core/src/test/proto/com/google/protobuf/non_nested_extension.proto
diff --git a/java/src/test/java/com/google/protobuf/non_nested_extension_lite.proto b/java/core/src/test/proto/com/google/protobuf/non_nested_extension_lite.proto
index 37c369ed..37c369ed 100644
--- a/java/src/test/java/com/google/protobuf/non_nested_extension_lite.proto
+++ b/java/core/src/test/proto/com/google/protobuf/non_nested_extension_lite.proto
diff --git a/java/src/test/java/com/google/protobuf/outer_class_name_test.proto b/java/core/src/test/proto/com/google/protobuf/outer_class_name_test.proto
index 42083681..42083681 100644
--- a/java/src/test/java/com/google/protobuf/outer_class_name_test.proto
+++ b/java/core/src/test/proto/com/google/protobuf/outer_class_name_test.proto
diff --git a/java/src/test/java/com/google/protobuf/outer_class_name_test2.proto b/java/core/src/test/proto/com/google/protobuf/outer_class_name_test2.proto
index 3e5956b0..3e5956b0 100644
--- a/java/src/test/java/com/google/protobuf/outer_class_name_test2.proto
+++ b/java/core/src/test/proto/com/google/protobuf/outer_class_name_test2.proto
diff --git a/java/src/test/java/com/google/protobuf/outer_class_name_test3.proto b/java/core/src/test/proto/com/google/protobuf/outer_class_name_test3.proto
index 74a8ba3c..74a8ba3c 100644
--- a/java/src/test/java/com/google/protobuf/outer_class_name_test3.proto
+++ b/java/core/src/test/proto/com/google/protobuf/outer_class_name_test3.proto
diff --git a/java/src/test/java/com/google/protobuf/test_bad_identifiers.proto b/java/core/src/test/proto/com/google/protobuf/test_bad_identifiers.proto
index 2b1f65e4..2b1f65e4 100644
--- a/java/src/test/java/com/google/protobuf/test_bad_identifiers.proto
+++ b/java/core/src/test/proto/com/google/protobuf/test_bad_identifiers.proto
diff --git a/java/src/test/java/com/google/protobuf/test_check_utf8.proto b/java/core/src/test/proto/com/google/protobuf/test_check_utf8.proto
index 119c1dcb..119c1dcb 100644
--- a/java/src/test/java/com/google/protobuf/test_check_utf8.proto
+++ b/java/core/src/test/proto/com/google/protobuf/test_check_utf8.proto
diff --git a/java/src/test/java/com/google/protobuf/test_check_utf8_size.proto b/java/core/src/test/proto/com/google/protobuf/test_check_utf8_size.proto
index f06d76d6..f06d76d6 100644
--- a/java/src/test/java/com/google/protobuf/test_check_utf8_size.proto
+++ b/java/core/src/test/proto/com/google/protobuf/test_check_utf8_size.proto
diff --git a/java/src/test/java/com/google/protobuf/test_custom_options.proto b/java/core/src/test/proto/com/google/protobuf/test_custom_options.proto
index f8efd455..f8efd455 100644
--- a/java/src/test/java/com/google/protobuf/test_custom_options.proto
+++ b/java/core/src/test/proto/com/google/protobuf/test_custom_options.proto
diff --git a/java/src/test/java/com/google/protobuf/test_extra_interfaces.proto b/java/core/src/test/proto/com/google/protobuf/test_extra_interfaces.proto
index 645f57b4..645f57b4 100644
--- a/java/src/test/java/com/google/protobuf/test_extra_interfaces.proto
+++ b/java/core/src/test/proto/com/google/protobuf/test_extra_interfaces.proto
diff --git a/java/lite/pom.xml b/java/lite/pom.xml
index 29d8c8c4..70c7d047 100644
--- a/java/lite/pom.xml
+++ b/java/lite/pom.xml
@@ -84,7 +84,6 @@
             <include>**/AbstractMessageLite.java</include>
             <include>**/AbstractParser.java</include>
             <include>**/AbstractProtobufList.java</include>
-            <include>**/BoundedByteString.java</include>
             <include>**/BooleanArrayList.java</include>
             <include>**/ByteString.java</include>
             <include>**/CodedInputStream.java</include>
@@ -101,7 +100,6 @@
             <include>**/LazyFieldLite.java</include>
             <include>**/LazyStringArrayList.java</include>
             <include>**/LazyStringList.java</include>
-            <include>**/LiteralByteString.java</include>
             <include>**/LongArrayList.java</include>
             <include>**/MapEntryLite.java</include>
             <include>**/MapFieldLite.java</include>
@@ -119,7 +117,7 @@
             <include>**/UninitializedMessageException.java</include>
             <include>**/UnknownFieldSetLite.java</include>
             <include>**/UnmodifiableLazyStringList.java</include>
-            <include>**/UnsafeByteStrings.java</include>
+            <include>**/UnsafeByteOperations.java</include>
             <include>**/Utf8.java</include>
             <include>**/WireFormat.java</include>
           </includes>
diff --git a/java/src/main/java/com/google/protobuf/BoundedByteString.java b/java/src/main/java/com/google/protobuf/BoundedByteString.java
deleted file mode 100644
index 934c9030..00000000
--- a/java/src/main/java/com/google/protobuf/BoundedByteString.java
+++ /dev/null
@@ -1,124 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf;
-
-import java.io.IOException;
-import java.io.InvalidObjectException;
-import java.io.ObjectInputStream;
-
-/**
- * This class is used to represent the substring of a {@link ByteString} over a
- * single byte array. In terms of the public API of {@link ByteString}, you end
- * up here by calling {@link ByteString#copyFrom(byte[])} followed by {@link
- * ByteString#substring(int, int)}.
- *
- * <p>This class contains most of the overhead involved in creating a substring
- * from a {@link LiteralByteString}.  The overhead involves some range-checking
- * and two extra fields.
- *
- * @author carlanton@google.com (Carl Haverl)
- */
-final class BoundedByteString extends LiteralByteString {
-
-  private final int bytesOffset;
-  private final int bytesLength;
-
-  /**
-   * Creates a {@code BoundedByteString} backed by the sub-range of given array,
-   * without copying.
-   *
-   * @param bytes  array to wrap
-   * @param offset index to first byte to use in bytes
-   * @param length number of bytes to use from bytes
-   * @throws IllegalArgumentException if {@code offset < 0}, {@code length < 0},
-   *                                  or if {@code offset + length >
-   *                                  bytes.length}.
-   */
-  BoundedByteString(byte[] bytes, int offset, int length) {
-    super(bytes);
-    checkRange(offset, offset + length, bytes.length);
-
-    this.bytesOffset = offset;
-    this.bytesLength = length;
-  }
-
-  /**
-   * Gets the byte at the given index.
-   * Throws {@link ArrayIndexOutOfBoundsException}
-   * for backwards-compatibility reasons although it would more properly be
-   * {@link IndexOutOfBoundsException}.
-   *
-   * @param index index of byte
-   * @return the value
-   * @throws ArrayIndexOutOfBoundsException {@code index} is < 0 or >= size
-   */
-  @Override
-  public byte byteAt(int index) {
-    // We must check the index ourselves as we cannot rely on Java array index
-    // checking for substrings.
-    checkIndex(index, size());
-    return bytes[bytesOffset + index];
-  }
-
-  @Override
-  public int size() {
-    return bytesLength;
-  }
-
-  @Override
-  protected int getOffsetIntoBytes() {
-    return bytesOffset;
-  }
-
-  // =================================================================
-  // ByteString -> byte[]
-
-  @Override
-  protected void copyToInternal(byte[] target, int sourceOffset, int targetOffset,
-      int numberToCopy) {
-    System.arraycopy(bytes, getOffsetIntoBytes() + sourceOffset, target,
-        targetOffset, numberToCopy);
-  }
-
-  // =================================================================
-  // Serializable
-
-  private static final long serialVersionUID = 1L;
-
-  Object writeReplace() {
-    return new LiteralByteString(toByteArray());
-  }
-
-  private void readObject(@SuppressWarnings("unused") ObjectInputStream in) throws IOException {
-    throw new InvalidObjectException(
-        "BoundedByteStream instances are not to be serialized directly");
-  }
-}
diff --git a/java/src/main/java/com/google/protobuf/LiteralByteString.java b/java/src/main/java/com/google/protobuf/LiteralByteString.java
deleted file mode 100644
index a18c2792..00000000
--- a/java/src/main/java/com/google/protobuf/LiteralByteString.java
+++ /dev/null
@@ -1,267 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf;
-
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.nio.ByteBuffer;
-import java.nio.charset.Charset;
-import java.util.Collections;
-import java.util.List;
-
-/**
- * This class implements a {@link com.google.protobuf.ByteString} backed by a
- * single array of bytes, contiguous in memory. It supports substring by
- * pointing to only a sub-range of the underlying byte array, meaning that a
- * substring will reference the full byte-array of the string it's made from,
- * exactly as with {@link String}.
- *
- * @author carlanton@google.com (Carl Haverl)
- */
-class LiteralByteString extends ByteString.LeafByteString {
-  private static final long serialVersionUID = 1L;
-
-  protected final byte[] bytes;
-
-  /**
-   * Creates a {@code LiteralByteString} backed by the given array, without
-   * copying.
-   *
-   * @param bytes array to wrap
-   */
-  LiteralByteString(byte[] bytes) {
-    this.bytes = bytes;
-  }
-
-  @Override
-  public byte byteAt(int index) {
-    // Unlike most methods in this class, this one is a direct implementation
-    // ignoring the potential offset because we need to do range-checking in the
-    // substring case anyway.
-    return bytes[index];
-  }
-
-  @Override
-  public int size() {
-    return bytes.length;
-  }
-
-  // =================================================================
-  // ByteString -> substring
-
-  @Override
-  public final ByteString substring(int beginIndex, int endIndex) {
-    final int length = checkRange(beginIndex, endIndex, size());
-
-    if (length == 0) {
-      return ByteString.EMPTY;
-    }
-
-    return new BoundedByteString(bytes, getOffsetIntoBytes() + beginIndex, length);
-  }
-
-  // =================================================================
-  // ByteString -> byte[]
-
-  @Override
-  protected void copyToInternal(
-      byte[] target, int sourceOffset, int targetOffset, int numberToCopy) {
-    // Optimized form, not for subclasses, since we don't call
-    // getOffsetIntoBytes() or check the 'numberToCopy' parameter.
-    // TODO(nathanmittler): Is not calling getOffsetIntoBytes really saving that much?
-    System.arraycopy(bytes, sourceOffset, target, targetOffset, numberToCopy);
-  }
-
-  @Override
-  public final void copyTo(ByteBuffer target) {
-    target.put(bytes, getOffsetIntoBytes(), size()); // Copies bytes
-  }
-
-  @Override
-  public final ByteBuffer asReadOnlyByteBuffer() {
-    return ByteBuffer.wrap(bytes, getOffsetIntoBytes(), size()).asReadOnlyBuffer();
-  }
-
-  @Override
-  public final List<ByteBuffer> asReadOnlyByteBufferList() {
-    return Collections.singletonList(asReadOnlyByteBuffer());
-  }
-
-  @Override
-  public final void writeTo(OutputStream outputStream) throws IOException {
-    outputStream.write(toByteArray());
-  }
-
-  @Override
-  final void writeToInternal(OutputStream outputStream, int sourceOffset, int numberToWrite)
-      throws IOException {
-    outputStream.write(bytes, getOffsetIntoBytes() + sourceOffset, numberToWrite);
-  }
-
-  @Override
-  protected final String toStringInternal(Charset charset) {
-    return new String(bytes, getOffsetIntoBytes(), size(), charset);
-  }
-
-  // =================================================================
-  // UTF-8 decoding
-
-  @Override
-  public final boolean isValidUtf8() {
-    int offset = getOffsetIntoBytes();
-    return Utf8.isValidUtf8(bytes, offset, offset + size());
-  }
-
-  @Override
-  protected final int partialIsValidUtf8(int state, int offset, int length) {
-    int index = getOffsetIntoBytes() + offset;
-    return Utf8.partialIsValidUtf8(state, bytes, index, index + length);
-  }
-
-  // =================================================================
-  // equals() and hashCode()
-
-  @Override
-  public final boolean equals(Object other) {
-    if (other == this) {
-      return true;
-    }
-    if (!(other instanceof ByteString)) {
-      return false;
-    }
-
-    if (size() != ((ByteString) other).size()) {
-      return false;
-    }
-    if (size() == 0) {
-      return true;
-    }
-
-    if (other instanceof LiteralByteString) {
-      LiteralByteString otherAsLiteral = (LiteralByteString) other;
-      // If we know the hash codes and they are not equal, we know the byte
-      // strings are not equal.
-      int thisHash = peekCachedHashCode();
-      int thatHash = otherAsLiteral.peekCachedHashCode();
-      if (thisHash != 0 && thatHash != 0 && thisHash != thatHash) {
-        return false;
-      }
-
-      return equalsRange((LiteralByteString) other, 0, size());
-    } else {
-      // RopeByteString and NioByteString.
-      return other.equals(this);
-    }
-  }
-
-  /**
-   * Check equality of the substring of given length of this object starting at
-   * zero with another {@code LiteralByteString} substring starting at offset.
-   *
-   * @param other  what to compare a substring in
-   * @param offset offset into other
-   * @param length number of bytes to compare
-   * @return true for equality of substrings, else false.
-   */
-  @Override
-  final boolean equalsRange(ByteString other, int offset, int length) {
-    if (length > other.size()) {
-      throw new IllegalArgumentException("Length too large: " + length + size());
-    }
-    if (offset + length > other.size()) {
-      throw new IllegalArgumentException(
-          "Ran off end of other: " + offset + ", " + length + ", " + other.size());
-    }
-
-    if (other instanceof LiteralByteString) {
-      LiteralByteString lbsOther = (LiteralByteString) other;
-      byte[] thisBytes = bytes;
-      byte[] otherBytes = lbsOther.bytes;
-      int thisLimit = getOffsetIntoBytes() + length;
-      for (
-          int thisIndex = getOffsetIntoBytes(), otherIndex = lbsOther.getOffsetIntoBytes() + offset;
-          (thisIndex < thisLimit); ++thisIndex, ++otherIndex) {
-        if (thisBytes[thisIndex] != otherBytes[otherIndex]) {
-          return false;
-        }
-      }
-      return true;
-    }
-
-    return other.substring(offset, offset + length).equals(substring(0, length));
-  }
-
-  @Override
-  protected final int partialHash(int h, int offset, int length) {
-    return hashCode(h, bytes, getOffsetIntoBytes() + offset, length);
-  }
-
-  static int hashCode(int h, byte[] bytes, int offset, int length) {
-    for (int i = offset; i < offset + length; i++) {
-      h = h * 31 + bytes[i];
-    }
-    return h;
-  }
-
-  static int hashCode(byte[] bytes) {
-    int h = hashCode(bytes.length, bytes, 0, bytes.length);
-    return h == 0 ? 1 : h;
-  }
-
-  // =================================================================
-  // Input stream
-
-  @Override
-  public final InputStream newInput() {
-    return new ByteArrayInputStream(bytes, getOffsetIntoBytes(), size()); // No copy
-  }
-
-  @Override
-  public final CodedInputStream newCodedInput() {
-    // We trust CodedInputStream not to modify the bytes, or to give anyone
-    // else access to them.
-    return CodedInputStream.newInstance(this);
-  }
-
-  // =================================================================
-  // Internal methods
-
-  /**
-   * Offset into {@code bytes[]} to use, non-zero for substrings.
-   *
-   * @return always 0 for this class
-   */
-  protected int getOffsetIntoBytes() {
-    return 0;
-  }
-}
diff --git a/java/src/test/java/com/google/protobuf/ParseExceptionsTest.java b/java/src/test/java/com/google/protobuf/ParseExceptionsTest.java
deleted file mode 100644
index 37fa242d..00000000
--- a/java/src/test/java/com/google/protobuf/ParseExceptionsTest.java
+++ /dev/null
@@ -1,211 +0,0 @@
-package com.google.protobuf;
-
-import com.google.protobuf.DescriptorProtos.DescriptorProto;
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.FilterInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import org.junit.Test;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
-
-/**
- * Tests the exceptions thrown when parsing from a stream. The methods on the {@link Parser}
- * interface are specified to only throw {@link InvalidProtocolBufferException}. But we really want
- * to distinguish between invalid protos vs. actual I/O errors (like failures reading from a
- * socket, etc.). So, when we're not using the parser directly, an {@link IOException} should be
- * thrown where appropriate, instead of always an {@link InvalidProtocolBufferException}.
- *
- * @author jh@squareup.com (Joshua Humphries)
- */
-public class ParseExceptionsTest {
-
-  private interface ParseTester {
-    DescriptorProto parse(InputStream in) throws IOException;
-  }
-
-  private byte serializedProto[];
-
-  private void setup() {
-    serializedProto = DescriptorProto.getDescriptor().toProto().toByteArray();
-  }
-
-  private void setupDelimited() {
-    ByteArrayOutputStream bos = new ByteArrayOutputStream();
-    try {
-      DescriptorProto.getDescriptor().toProto().writeDelimitedTo(bos);
-    } catch (IOException e) {
-      fail("Exception not expected: " + e);
-    }
-    serializedProto = bos.toByteArray();
-  }
-
-  @Test public void message_parseFrom_InputStream() {
-    setup();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        return DescriptorProto.parseFrom(in);
-      }
-    });
-  }
-
-  @Test public void message_parseFrom_InputStreamAndExtensionRegistry() {
-    setup();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        return DescriptorProto.parseFrom(in, ExtensionRegistry.newInstance());
-      }
-    });
-  }
-
-  @Test public void message_parseFrom_CodedInputStream() {
-    setup();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        return DescriptorProto.parseFrom(CodedInputStream.newInstance(in));
-      }
-    });
-  }
-
-  @Test public void message_parseFrom_CodedInputStreamAndExtensionRegistry() {
-    setup();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        return DescriptorProto.parseFrom(CodedInputStream.newInstance(in),
-            ExtensionRegistry.newInstance());
-      }
-    });
-  }
-
-  @Test public void message_parseDelimitedFrom_InputStream() {
-    setupDelimited();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        return DescriptorProto.parseDelimitedFrom(in);
-      }
-    });
-  }
-
-  @Test public void message_parseDelimitedFrom_InputStreamAndExtensionRegistry() {
-    setupDelimited();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        return DescriptorProto.parseDelimitedFrom(in, ExtensionRegistry.newInstance());
-      }
-    });
-  }
-
-  @Test public void messageBuilder_mergeFrom_InputStream() {
-    setup();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        return DescriptorProto.newBuilder().mergeFrom(in).build();
-      }
-    });
-  }
-
-  @Test public void messageBuilder_mergeFrom_InputStreamAndExtensionRegistry() {
-    setup();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        return DescriptorProto.newBuilder().mergeFrom(in, ExtensionRegistry.newInstance()).build();
-      }
-    });
-  }
-
-  @Test public void messageBuilder_mergeFrom_CodedInputStream() {
-    setup();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        return DescriptorProto.newBuilder().mergeFrom(CodedInputStream.newInstance(in)).build();
-      }
-    });
-  }
-
-  @Test public void messageBuilder_mergeFrom_CodedInputStreamAndExtensionRegistry() {
-    setup();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        return DescriptorProto.newBuilder()
-            .mergeFrom(CodedInputStream.newInstance(in), ExtensionRegistry.newInstance()).build();
-      }
-    });
-  }
-
-  @Test public void messageBuilder_mergeDelimitedFrom_InputStream() {
-    setupDelimited();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        DescriptorProto.Builder builder = DescriptorProto.newBuilder();
-        builder.mergeDelimitedFrom(in);
-        return builder.build();
-      }
-    });
-  }
-
-  @Test public void messageBuilder_mergeDelimitedFrom_InputStreamAndExtensionRegistry() {
-    setupDelimited();
-    verifyExceptions(new ParseTester() {
-      public DescriptorProto parse(InputStream in) throws IOException {
-        DescriptorProto.Builder builder = DescriptorProto.newBuilder();
-        builder.mergeDelimitedFrom(in, ExtensionRegistry.newInstance());
-        return builder.build();
-      }
-    });
-  }
-
-  private void verifyExceptions(ParseTester parseTester) {
-    // No exception
-    try {
-      assertEquals(DescriptorProto.getDescriptor().toProto(),
-          parseTester.parse(new ByteArrayInputStream(serializedProto)));
-    } catch (IOException e) {
-      fail("No exception expected: " + e);
-    }
-
-    // IOException
-    try {
-      // using a "broken" stream that will throw part-way through reading the message
-      parseTester.parse(broken(new ByteArrayInputStream(serializedProto)));
-      fail("IOException expected but not thrown");
-    } catch (IOException e) {
-      assertFalse(e instanceof InvalidProtocolBufferException);
-    }
-
-    // InvalidProtocolBufferException
-    try {
-      // make the serialized proto invalid
-      for (int i = 0; i < 50; i++) {
-        serializedProto[i] = -1;
-      }
-      parseTester.parse(new ByteArrayInputStream(serializedProto));
-      fail("InvalidProtocolBufferException expected but not thrown");
-    } catch (IOException e) {
-      assertTrue(e instanceof InvalidProtocolBufferException);
-    }
-  }
-
-  private InputStream broken(InputStream i) {
-    return new FilterInputStream(i) {
-      int count = 0;
-
-      @Override public int read() throws IOException {
-        if (count++ >= 50) {
-          throw new IOException("I'm broken!");
-        }
-        return super.read();
-      }
-
-      @Override public int read(byte b[], int off, int len) throws IOException {
-        if ((count += len) >= 50) {
-          throw new IOException("I'm broken!");
-        }
-        return super.read(b, off, len);
-      }
-    };
-  }
-}
diff --git a/java/util/src/test/java/com/google/protobuf/util/json_test.proto b/java/util/src/test/proto/com/google/protobuf/util/json_test.proto
index 509c1d69..509c1d69 100644
--- a/java/util/src/test/java/com/google/protobuf/util/json_test.proto
+++ b/java/util/src/test/proto/com/google/protobuf/util/json_test.proto