--- old/src/java.corba/share/classes/com/sun/corba/se/impl/io/OutputStreamHook.java	Mon Mar 23 18:02:19 2015
+++ new/src/java.corba/share/classes/com/sun/corba/se/impl/io/OutputStreamHook.java	Mon Mar 23 18:02:19 2015
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -152,9 +152,11 @@
 
     public abstract void defaultWriteObjectDelegate();
 
-    public ObjectOutputStream.PutField putFields()
+    public synchronized ObjectOutputStream.PutField putFields()
         throws IOException {
-        putFields = new HookPutFields();
+        if (putFields == null) {
+            putFields = new HookPutFields();
+        }
         return putFields;
     }
 
@@ -175,8 +177,11 @@
         throws IOException {
 
         writeObjectState.defaultWriteObject(this);
-
-        putFields.write(this);
+        synchronized (this) {
+            if (putFields != null) {
+                putFields.write(this);
+            }
+        }
     }
 
     abstract org.omg.CORBA_2_3.portable.OutputStream getOrbStream();