protected String doIntercept(ActionInvocation invocation) throws Exception 
{
        Object action = invocation.getAction();
        if (action != null) {
            Method method = getActionMethod(action.getClass(), invocation.getProxy().getMethod());
            Collection< Method > annotatedMethods = AnnotationUtils.getAnnotatedMethods(action.getClass(), SkipValidation.class);
            if (annotatedMethods.contains(method))
                return invocation.invoke();
            //check if method overwites an annotated method
            Class clazz = action.getClass().getSuperclass();
            while (clazz != null) {
                annotatedMethods = AnnotationUtils.getAnnotatedMethods(clazz, SkipValidation.class);
                if (annotatedMethods != null) {
                    for (Method annotatedMethod : annotatedMethods) {
                        if (annotatedMethod.getName().equals(method.getName())
                                && Arrays.equals(annotatedMethod.getParameterTypes(), method.getParameterTypes())
                                && Arrays.equals(annotatedMethod.getExceptionTypes(), method.getExceptionTypes()))
                            return invocation.invoke();
                    }
                }
                clazz = clazz.getSuperclass();
            }
        }
        return super.doIntercept(invocation);
}

 protected Method getActionMethod(Class actionClass,
    String methodName) throws NoSuchMethodException 
{
        Method method;
        try {
            method = actionClass.getMethod(methodName, new Class[0]);
        } catch (NoSuchMethodException e) {
            // hmm -- OK, try doXxx instead
            try {
                String altMethodName = "do" + methodName.substring(0, 1).toUpperCase() + methodName.substring(1);
                method = actionClass.getMethod(altMethodName, new Class[0]);
            } catch (NoSuchMethodException e1) {
                // throw the original one
                throw e;
            }
        }
        return method;
}