diff --git a/lib/java/src/org/apache/thrift/TBaseHelper.java b/lib/java/src/org/apache/thrift/TBaseHelper.java
index 9a7ee73..46075d3 100644
--- a/lib/java/src/org/apache/thrift/TBaseHelper.java
+++ b/lib/java/src/org/apache/thrift/TBaseHelper.java
@@ -240,4 +240,37 @@
     int extended = (b | 0x100) & 0x1ff;
     return Integer.toHexString(extended).toUpperCase().substring(1);
   }
+
+  public static byte[] byteBufferToByteArray(ByteBuffer byteBuffer) {
+    if (wrapsFullArray(byteBuffer)) {
+      return byteBuffer.array();
+    }
+    byte[] target = new byte[byteBuffer.remaining()];
+    byteBufferToByteArray(byteBuffer, target, 0);
+    return target;
+  }
+
+  public static boolean wrapsFullArray(ByteBuffer byteBuffer) {
+    return byteBuffer.hasArray()
+      && byteBuffer.position() == 0
+      && byteBuffer.arrayOffset() == 0
+      && byteBuffer.remaining() == byteBuffer.capacity();
+  }
+
+  public static int byteBufferToByteArray(ByteBuffer byteBuffer, byte[] target, int offset) {
+    int remaining = byteBuffer.remaining();
+    System.arraycopy(byteBuffer.array(),
+        byteBuffer.arrayOffset() + byteBuffer.position(),
+        target,
+        offset,
+        remaining);
+    return remaining;
+  }
+
+  public static ByteBuffer rightSize(ByteBuffer in) {
+    if (wrapsFullArray(in)) {
+      return in;
+    }
+    return ByteBuffer.wrap(byteBufferToByteArray(in));
+  }
 }
diff --git a/lib/java/test/org/apache/thrift/TestTBaseHelper.java b/lib/java/test/org/apache/thrift/TestTBaseHelper.java
index 6f24093..2c8caac 100644
--- a/lib/java/test/org/apache/thrift/TestTBaseHelper.java
+++ b/lib/java/test/org/apache/thrift/TestTBaseHelper.java
@@ -18,6 +18,7 @@
  */
 package org.apache.thrift;
 
+import java.nio.ByteBuffer;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -139,4 +140,14 @@
     b.add(new byte[]{'a','b', 'a'});
     assertTrue(TBaseHelper.compareTo(a, b) > 0);
   }
+
+  public void testByteBufferToByteArray() throws Exception {
+    byte[] b1 = {10,9,8,7,6,5,4,3,2,1,0};
+    byte[] b2 = TBaseHelper.byteBufferToByteArray(ByteBuffer.wrap(b1));
+    assertEquals("b1 and b2 should be the exact same array (identity) due to fast path", b1, b2);
+
+    byte[] b3 = TBaseHelper.byteBufferToByteArray(ByteBuffer.wrap(b1, 1, 3));
+    assertEquals(3, b3.length);
+    assertEquals(ByteBuffer.wrap(b1, 1, 3), ByteBuffer.wrap(b3));
+  }
 }
diff --git a/lib/java/test/org/apache/thrift/TestTDeserializer.java b/lib/java/test/org/apache/thrift/TestTDeserializer.java
index 1f141bd..a4a353d 100644
--- a/lib/java/test/org/apache/thrift/TestTDeserializer.java
+++ b/lib/java/test/org/apache/thrift/TestTDeserializer.java
@@ -97,7 +97,7 @@
       String resultString = deserializer.partialDeserializeString(serialize(level1SWU, factory), StructWithAUnion._Fields.TEST_UNION, TestUnion._Fields.STRUCT_FIELD, OneOfEach._Fields.SOME_CHARACTERS);
       assertEquals(expectedString, resultString);
 
-      byte[] expectedBinary = level3OneOfEach.getBase64().array();
+      byte[] expectedBinary = level3OneOfEach.getBase64();
       ByteBuffer resultBinary = deserializer.partialDeserializeByteArray(serialize(level1SWU, factory), StructWithAUnion._Fields.TEST_UNION, TestUnion._Fields.STRUCT_FIELD, OneOfEach._Fields.BASE64);
       assertEquals(expectedBinary.length, resultBinary.limit() - resultBinary.position() - resultBinary.arrayOffset());
       assertEquals(ByteBuffer.wrap(expectedBinary), resultBinary);