[MINOR][ML] Improve MLWriter overwrite error message

## What changes were proposed in this pull request?

Give proper syntax for Java and Python in addition to Scala.

## How was this patch tested?

Manually.

Author: Joseph K. Bradley <joseph@databricks.com>

Closes #17215 from jkbradley/write-err-msg.

1 files changed, 3 insertions, 2 deletions

diff --git a/mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala b/mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala
index 09bddcdb81..a8b80031fa 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala
@@ -104,8 +104,9 @@ abstract class MLWriter extends BaseReadWrite with Logging {
         // TODO: Revert back to the original content if save is not successful.
         fs.delete(qualifiedOutputPath, true)
       } else {
-        throw new IOException(
-          s"Path $path already exists. Please use write.overwrite().save(path) to overwrite it.")
+        throw new IOException(s"Path $path already exists. To overwrite it, " +
+          s"please use write.overwrite().save(path) for Scala and use " +
+          s"write().overwrite().save(path) for Java and Python.")
       }
     }
     saveImpl(path)