--- a/jdk/src/jdk.zipfs/share/classes/jdk/nio/zipfs/ZipFileSystem.java	Thu Jan 22 12:33:05 2015 +0000
+++ b/jdk/src/jdk.zipfs/share/classes/jdk/nio/zipfs/ZipFileSystem.java	Thu Jan 22 08:51:45 2015 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2009, 201, 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
@@ -1533,6 +1533,7 @@
         private CRC32 crc;
         private Entry e;
         private long written;
+        private boolean isClosed = false;
 
         EntryOutputStream(Entry e, OutputStream os)
             throws IOException
@@ -1545,9 +1546,14 @@
         }
 
         @Override
-        public void write(byte b[], int off, int len) throws IOException {
+        public synchronized void write(byte b[], int off, int len)
+            throws IOException
+        {
             if (e.type != Entry.FILECH)    // only from sync
                 ensureOpen();
+            if (isClosed) {
+                throw new IOException("Stream closed");
+            }
             if (off < 0 || len < 0 || off > b.length - len) {
                 throw new IndexOutOfBoundsException();
             } else if (len == 0) {
@@ -1568,7 +1574,11 @@
         }
 
         @Override
-        public void close() throws IOException {
+        public synchronized void close() throws IOException {
+            if (isClosed) {
+                return;
+            }
+            isClosed = true;
             // TBD ensureOpen();
             switch (e.method) {
             case METHOD_DEFLATED: