AnnotationWorkflowInterceptor should supports non-public annotated methods

@Before
protected String prepare(){
    //TODO
    return null;
}

https://github.com/apache/struts/blob/master/core/src/main/java/com/opensymphony/xwork2/interceptor/annotations/AnnotationWorkflowInterceptor.java#L115

List<Method> methods = new ArrayList<>(AnnotationUtils.getAnnotatedMethods(action.getClass(), Before.class));

https://github.com/apache/struts/blob/master/core/src/main/java/com/opensymphony/xwork2/util/AnnotationUtils.java#L123

for (Method m : clazz.getMethods()) 

clazz.getMethods() only return public methods, so method "prepare" will be excluded, and protected modifier is a good practice for intercept method.We should improve AnnotationUtils.getAnnotatedMethods() to return all methods. Perhaps use an ConcurrentHashMap as cache is much better.