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  public class MyAction extends ActionSupport {
     ...
     public String execute() throws Exception {
         ActionInvocation invocation = ActionContext.getContext().getActionInvocation();
         invocation.addPreResultListener(new PreResultListener() {
              public void beforeResult(ActionInvocation invocation, 
                                       String resultCode) {
                  // perform operation necessary before Result execution
              }
         });
     }
     ...
  }