Preventing System.exit() from API

Question

I am using a third party library that does a System.exit() if it encounters exceptions. I am using the APIs from a jar. Is there anyway that I can prevent the System.exit() call because it causes my application to shutdown? I cannot decompile and recompile the jar after removing the System.exit() because of a lot of other licensing issues. I once came across an answer [to some other question that I do not remember] in stackoverflow that we can use the SecurityManager in Java to do something like this.

Answer 1

There is a blog post here,

http://jroller.com/ethdsy/entry/disabling_system_exit

Basically it installs a security manager which disables System.exit() with code from here,

  private static class ExitTrappedException extends SecurityException { }

  private static void forbidSystemExitCall() {
    final SecurityManager securityManager = new SecurityManager() {
      public void checkPermission( Permission permission ) {
        if( "exitVM".equals( permission.getName() ) ) {
          throw new ExitTrappedException() ;
        }
      }
    } ;
    System.setSecurityManager( securityManager ) ;
  }

  private static void enableSystemExitCall() {
    System.setSecurityManager( null ) ;
  }

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Edit: Max points out in comments below that

as of Java 6, the permission name is actually "exitVM."+status, e.g. "exitVM.0".

However, the permission exitVM.* refers to all exit statuses, and exitVM is retained as a shorthand for exitVM.*, so the above code still works (see the documentation for RuntimePermission).