import java.security.Permission;

// Copy-&-pasted (almost) from
// http://www.jroller.com/ethdsy/entry/disabling_system_exit
class ForbidSystemExit
{
  public static class Exception extends SecurityException { }

  public static void apply() {
    final SecurityManager securityManager = new SecurityManager() {
      public void checkPermission( Permission permission ) {
        if( permission.getName().startsWith("exitVM") ) {
          throw new Exception() ;
        }
      }
    } ;
    System.setSecurityManager( securityManager ) ;
  }

  public static void unapply() {
    System.setSecurityManager( null ) ;
  }
}