How to add a custom menu entry which calls a Java class without UI feedback?

For a project I'd like to customize Windchill 10.0 M030 in order to have a menu entry which will call a Java class method and won't open a popup, wizard or refresh the UI.

I already customized menu entries which opened a JSP and there I could of course do the Java part but I'd like to have no JSP appearing as popup.