protected static  void displayUsage() 
{
   
      System.out.println("A JMX client to shutdown (exit or halt) a remote JBoss server.");
      System.out.println();
      System.out.println("usage: " + PROGRAM_NAME + " [options] < operation >");
      System.out.println();
      System.out.println("options:");
      System.out.println("    -h, --help                Show this help message (default)");
      System.out.println("    -D< name >[=< value >]        Set a system property");
      System.out.println("    --                        Stop processing options");
      System.out.println("    -s, --server=< url >        Specify the JNDI URL of the remote server");
      System.out.println("    -n, --serverName=< url >    Specify the JMX name of the ServerImpl");
      System.out.println("    -a, --adapter=< name >      Specify JNDI name of the MBeanServerConnection to use");
      System.out.println("    -u, --user=< name >         Specify the username for authentication");
      System.out.println("    -p, --password=< name >     Specify the password for authentication");
      System.out.println();
      System.out.println("operations:");
      System.out.println("    -S, --shutdown            Shutdown the server");
      System.out.println("    -e, --exit=< code >         Force the VM to exit with a status code");
      System.out.println("    -H, --halt=< code >         Force the VM to halt with a status code");
      System.out.println();
}

 public static  void main(String[] args) throws Exception 
{
      if (args.length == 0)
      {
         displayUsage();
         System.exit(0);
      }
      String sopts = "-:hD:s:n:a:u:p:Se:H:";
      LongOpt[] lopts =
      {
         new LongOpt("help", LongOpt.NO_ARGUMENT, null, 'h"),
         new LongOpt("server", LongOpt.REQUIRED_ARGUMENT, null, 's"),
         new LongOpt("adapter", LongOpt.REQUIRED_ARGUMENT, null, 'a"),
         new LongOpt("serverName", LongOpt.REQUIRED_ARGUMENT, null, 'n"),
         new LongOpt("shutdown", LongOpt.NO_ARGUMENT, null, 'S"),
         new LongOpt("exit", LongOpt.REQUIRED_ARGUMENT, null, 'e"),
         new LongOpt("halt", LongOpt.REQUIRED_ARGUMENT, null, 'H"),
         new LongOpt("user", LongOpt.REQUIRED_ARGUMENT, null, 'u"),
         new LongOpt("password", LongOpt.REQUIRED_ARGUMENT, null, 'p"),
      };
      Getopt getopt = new Getopt(PROGRAM_NAME, args, sopts, lopts);
      int code;
      String arg;
      String serverURL = null;
      String adapterName = "jmx/rmi/RMIAdaptor";
      String username = null;
      String password = null;
      ObjectName serverJMXName = ServerImplMBean.OBJECT_NAME;
      boolean exit = false;
      boolean halt = false;
      int exitcode = -1;
      while ((code = getopt.getopt()) != -1)
      {
         switch (code)
         {
            case ':":
            case '?":
               // for now both of these should exit with error status
               System.exit(1);
               break;
            case 1:
               // this will catch non-option arguments
               // (which we don't currently care about)
               System.err.println(PROGRAM_NAME + ": unused non-option argument: " +
               getopt.getOptarg());
               break;
            case 'h":
               displayUsage();
               System.exit(0);
               break;
            case 'D":
            {
               // set a system property
               arg = getopt.getOptarg();
               String name, value;
               int i = arg.indexOf("=");
               if (i == -1)
               {
                  name = arg;
                  value = "true";
               }
               else
               {
                  name = arg.substring(0, i);
                  value = arg.substring(i + 1, arg.length());
               }
               System.setProperty(name, value);
               break;
            }
            case 's":
               serverURL = getopt.getOptarg();
               break;
            case 'n":
               serverJMXName = new ObjectName(getopt.getOptarg());
               break;
            case 'S":
               // nothing...
               break;
            case 'a":
               adapterName = getopt.getOptarg();
               break;
            case 'u":
               username = getopt.getOptarg();
               SecurityAssociation.setPrincipal(new SimplePrincipal(username));
               break;
            case 'p":
               password = getopt.getOptarg();
               SecurityAssociation.setCredential(password);
               break;
            case 'e":
               exitcode = Integer.parseInt(getopt.getOptarg());
               exit = true;
               break;
            case 'H":
               exitcode = Integer.parseInt(getopt.getOptarg());
               halt = true;
               break;
         }
      }
      InitialContext ctx;
      // If there was a username specified, but no password prompt for it
      if( username != null && password == null )
      {
         System.out.print("Enter password for "+username+": ");
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         password = br.readLine();
         SecurityAssociation.setCredential(password);
      }
      if (serverURL == null)
      {
         ctx = new InitialContext();
      }
      else
      {
         Hashtable env = new Hashtable();
         env.put(Context.PROVIDER_URL, serverURL);
         env.put(NamingContext.JNP_DISABLE_DISCOVERY, "true");
         ctx  = new InitialContext(env);
      }
      Object obj = ctx.lookup(adapterName);
      if (!(obj instanceof MBeanServerConnection))
      {
         throw new RuntimeException("Object not of type: MBeanServerConnection, but: " +
            (obj == null ? "not found" : obj.getClass().getName()));
      }
      MBeanServerConnection adaptor = (MBeanServerConnection) obj;
      ServerProxyHandler handler = new ServerProxyHandler(adaptor, serverJMXName);
      Class[] ifaces = {Server.class};
      ClassLoader tcl = Thread.currentThread().getContextClassLoader();
      Server server = (Server) Proxy.newProxyInstance(tcl, ifaces, handler);
      if (exit)
      {
         server.exit(exitcode);
      }
      else if (halt)
      {
         server.halt(exitcode);
      }
      else
      {
         server.shutdown();
      }
      System.out.println("Shutdown message has been posted to the server.");
      System.out.println("Server shutdown may take a while - check logfiles for completion");
}