Disabling System.exit() and shutdown calls

Question

I am trying to splice/hack together something that might stop a System.exit(0) call or perhaps some type of exit call for a Java application. The only thing I have come up with now is making an extension of SecurityException and putting the shutdown code within a try. Here is what I have so far...
class ExitTrappedException extends SecurityException {
     protected static void forbidSystemExitCall() {
          final SecurityManager securityManager = new SecurityManager() {
               public void checkPermission( java.security.Permission permission ) {
                    if( "exitVM".equals( permission.getName() ) ) {
                         throw new ExitTrappedException() ;
          System.setSecurityManager( securityManager ) ;
     protected static void enableSystemExitCall() {
          System.setSecurityManager( null ) ;
}And then utilizing it in the following manner...
forbidExitCall() ;
    try {
      // Call the "exiting" code here...
    } catch( ExitTrappedException e ) {
    } finally {
      enableExitCall() ;
    }I am not very comfortable setting the SecurityManager to null when re-enabling it to be honest. I am curious if someone might have a different solution to stopping a System.exit(0) call and the windows altf4+ shortcut. Any help would be much appreciated.

Answer 1

     static SecurityManager securityDefault = System.getSecurityManager();
     protected static void forbidSystemExitCall() {
          final SecurityManager securityManager = new SecurityManager() {
               public void checkPermission( java.security.Permission permission ) {
                    if( "exitVM".equals( permission.getName() ) ) {
                         throw new ExitTrappedException() ;
          System.setSecurityManager( securityManager ) ;
     protected static void enableSystemExitCall() {
          System.setSecurityManager( securityDefault ) ;
}how bout that?
Edited by: brillohead on Aug 4, 2008 11:21 AM