Avoiding system.exit(0)

Question

Hi
I am using an external .jar file in my java program for parsing a file. My problem is that its main method has System.exit statement in the end i.e after parsing it exits the application. So when i use it my application also gets terminated. I have decompiled it and the only accessible method is main method. Is there any way to avoid this system.exit(0) ?

Answer 1

EJP wrote:
You can run it under a SecurityManager and a .policy file which doesn't grant that permission.I am trying to overrite securityManager functions:
like:
private static void forbidSystemExitCall() {
    final SecurityManager securityManager = new SecurityManager() {
            @Override
      public void checkPermission( Permission permission ) {
                System.out.println("persmiion");
        if( "exitVM".equals( permission.getName() ) ) {
         throw new SecurityException("System.exit attempted and blocked.");
            @Override
      public void checkExit(int exit)
          super.checkExit(exit);
          throw new SecurityException("System.exit attempted and blocked.");
    //System.setSecurityManager( securityManager ) ;
  }and calling above code as:
             try
                    forbidSystemExitCall() ;
                    try
                       Main.main(strings);
                    catch( ExitTrappedException e )
                    finally
                      enableSystemExitCall() ;
               catch ( Exception ex)
                   System.out.println("error calling main method");
                   ex.printStackTrace();
               }but above code is not working as i requried.
Or if you have stuff to do on exit you can add shutdown hooks, see java.lang.Runtime.i could not understand it, please kindly can you explain little bit more... I have not play with java security before.
BR
Umer