TODO

Some personal notes about what can be improved
==============================================

* Gui: try single jvm launching?
* Gui: try toplevel frame slurping?

* Applet: use downloader?

* Jar: verify signatures/auto accept signatures?

* standalone AppletViewer using Properties file?

* GitHub releases? Proper java version selector?

====
  // Running JNLP without launching external
  public class ExitPreventedException extends SecurityException {
    protected int status = 0;
    public ExitPreventedException setStatus(int code) {
      status = code;
      return this;
    }
    public int getStatus() { return status; }
  }

  public class PreventExitSecurityManager extends SecurityManager {
    private SecurityManager parent;
    PreventExitSecurityManager(SecurityManager _parent) {
      parent = _parent;
    }
    PreventExitSecurityManager() {
      this(System.getSecurityManager());
    }
    @Override
    public void checkPermission(java.security.Permission perm) {
      String name = perm.getName();
      if (name.startsWith("exitVM.")) {
	int code = -1;
	try {
	  code = Integer.parseInt(name.substring("exitVM.".length()));
	} catch (Exception e) {}
	throw new ExitPreventedException().setStatus(code);
      }
      parent.checkPermission(perm);
    }
  }