1 import sun.security.util.SecurityConstants;

     2 import java.security.Permission;

     3 

     4 public class CustomSecurityManager extends SecurityManager {

     5     @Override

     6     public void checkPermission(Permission perm) {

     7         if (perm.implies(SecurityConstants.AWT.TOPLEVEL_WINDOW_PERMISSION)) {

     8             throw new SecurityException();

     9         }

    10     }

    11 }