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 ActionProxyFactory.getFactory(new MyActionProxyFactory() {
    ...
    public ActionInvocation createActionInvocation(ActionProxy actionProxy) 
                            throws Exception {
          createActionInvocation(actionProxy, new LinkedHashMap());
    }
    public ActionInvocation createActionInvocation(ActionProxy actionProxy, 
                            Map extraContext) throws Exception {
          createActionInvocation(actionProxy, extraContext, true);
    }
    public ActionInvocation createActionInvocation(ActionProxy actionProxy, 
                            Map extraContext, boolean pushAction) 
                            throws Exception {
          // do implementation of ActionInvocation herer
          .....
    }
    ...
 });