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diff --git a/java/core/src/main/java/com/google/protobuf/JavaType.java b/java/core/src/main/java/com/google/protobuf/JavaType.java
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+// 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;
+
+/**
+ * Enum that identifies the Java types required to store protobuf fields.
+ */
+@ExperimentalApi
+public enum JavaType {
+  VOID(Void.class, Void.class, null),
+  INT(int.class, Integer.class, 0),
+  LONG(long.class, Long.class, 0L),
+  FLOAT(float.class, Float.class, 0F),
+  DOUBLE(double.class, Double.class, 0D),
+  BOOLEAN(boolean.class, Boolean.class, false),
+  STRING(String.class, String.class, ""),
+  BYTE_STRING(ByteString.class, ByteString.class, ByteString.EMPTY),
+  ENUM(int.class, Integer.class, null),
+  MESSAGE(Object.class, Object.class, null);
+
+  private final Class<?> type;
+  private final Class<?> boxedType;
+  private final Object defaultDefault;
+
+  JavaType(Class<?> type, Class<?> boxedType, Object defaultDefault) {
+    this.type = type;
+    this.boxedType = boxedType;
+    this.defaultDefault = defaultDefault;
+  }
+
+  /**
+   * The default default value for fields of this type, if it's a primitive
+   * type.
+   */
+  public Object getDefaultDefault() {
+    return defaultDefault;
+  }
+
+  /**
+   * Gets the required type for a field that would hold a value of this type.
+   */
+  public Class<?> getType() {
+    return type;
+  }
+
+  /**
+   * @return the boxedType
+   */
+  public Class<?> getBoxedType() {
+    return boxedType;
+  }
+
+  /**
+   * Indicates whether or not this {@link JavaType} can be applied to a field of the given type.
+   */
+  public boolean isValidType(Class<?> t) {
+    return type.isAssignableFrom(t);
+  }
+}