Code review request: 7163483 JarSigner -verify -verbose does not format date string according to locale

[Jonathan Lu]

Hello security-dev,

Here's a patch for bug 7163483, could anybody please help to take a look?
http://cr.openjdk.java.net/~luchsh/7163483/

The problem is that command "jarsigner -verify -verbose my.jar" does not 
format date string according to current locale. following simple test 
case can be used to disclose this problem.

/*
  * Copyright (c) 2012 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
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License 
version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

/*
  * Portions Copyright (c) 2012 IBM Corporation
  */


import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.Locale;
import sun.security.tools.JarSigner;

public class bug7163483 {

     public static void main(String[] args) throws Exception {
         final String[] arg = { "-verify", "-verbose",
             System.getProperty("java.home")+"/lib/jce.jar"};

         ByteArrayOutputStream stream = new ByteArrayOutputStream(1024*64);
         PrintStream out = new PrintStream(stream);
         System.setOut(out);

         Locale.setDefault(Locale.GERMAN);
         JarSigner js = new JarSigner();
         js.run(arg);

         out.flush();
         String s1 = stream.toString();
         s1 = s1.substring(0, s1.length()/2);
         stream.reset();

         Locale.setDefault(Locale.FRANCE);
         js = new JarSigner();
         js.run(arg);

         out.flush();
         String s2 = stream.toString();
         s2 = s2.substring(0, s2.length()/2);

         if (s1.equals(s2)) {
             System.err.println("Header output for GERMAN locale is:"+s1);
             System.err.println("Header output for FRANCE locale is:"+s2);
             throw new RuntimeException(
                     "JarSigner verbose outputs are the same after 
setting locale!!");
         } else {
             System.err.println("Header output for GERMAN locale is:"+s1);
             System.err.println("Header output for FRANCE locale is:"+s2);
             System.err.println("Test passed!");
         }
     }
}

Thanks and best regards!
- Jonathan Lu