Inside Interceptor.intercept(), how do I know if the Action has already been executed?

Question

I\'m implementing some stuff in my Struts-based application using interceptors, and I\'m getting confused about how their lifecycle works. According to the Struts docs ("In

Answer 1

There's no two calls to the interceptor:

public class MyInterceptor implements Interceptor {

    public String intercept(ActionInvocation invocation) {
        /*
        This is before Action.execute(),
        and before all interceptors down the stack
        */

        String code = invocation.invoke();

        /*
        This is after Action.execute(),
        the result rendering and all
        interceptors down the stack,
        but before the interceptors
        higher up in the stack.
        */

        return code;
    }

}

(Note that the "two calls to intercept" I was witnessing in the debugger were a result of a less obvious redirect that I failed to notice. This confused me a lot.)