--- a/jdk/src/share/classes/com/sun/java/util/jar/pack/Utils.java	Thu Mar 17 14:42:40 2011 -0700
+++ b/jdk/src/share/classes/com/sun/java/util/jar/pack/Utils.java	Thu Mar 17 18:50:06 2011 -0700
@@ -268,18 +268,18 @@
         // 4947205 : Peformance is slow when using pack-effort=0
         out = new BufferedOutputStream(out);
         out = new NonCloser(out); // protect from JarOutputStream.close()
-        JarOutputStream jout = new JarOutputStream(out);
-        copyJarFile(in, jout);
-        jout.close();
+        try (JarOutputStream jout = new JarOutputStream(out)) {
+            copyJarFile(in, jout);
+        }
     }
     static void copyJarFile(JarFile in, OutputStream out) throws IOException {
 
         // 4947205 : Peformance is slow when using pack-effort=0
         out = new BufferedOutputStream(out);
         out = new NonCloser(out); // protect from JarOutputStream.close()
-        JarOutputStream jout = new JarOutputStream(out);
-        copyJarFile(in, jout);
-        jout.close();
+        try (JarOutputStream jout = new JarOutputStream(out)) {
+            copyJarFile(in, jout);
+        }
     }
         // Wrapper to prevent closing of client-supplied stream.
     static private