Struts2 ActionContext and ValueStack?

Question

My questions are:

1. In Struts2, does every action object have its own corresponding ActionContext and ValueStack?

In other words, for every new re

Answer 1

Q1. There is one ActionContext and there is only one ValueStack.

Q2.

Does this mean that previous ActionContext and ValueStack (related to action1) gets destroyed and a new ActionContext and ValueStack (for action2) gets created?

No.

Q3. I don't understand this question. What I think is missing is awareness of ThreadLocal so although there is one ActionContext each thread is able to have its own variables which are local to that thread and thus action scope for the ValueStack is maintained this way.

Answer 2

1. Yes

2. Yes after action execution clean up will be done.

   //SourceCode from StrutsPrepareAndExecuteFilter.
   
   //Cleans up a request of thread locals
   
   public void cleanupRequest(HttpServletRequest request) {
   
     Integer counterVal = (Integer) request.getAttribute(CLEANUP_RECURSION_COUNTER);
     if (counterVal != null) {
         counterVal -= 1;
         request.setAttribute(CLEANUP_RECURSION_COUNTER, counterVal);
         if (counterVal > 0 ) {
             if (log.isDebugEnabled()) {
                 log.debug("skipping cleanup counter="+counterVal);
             }
             return;
         }
     }
   
     // always clean up the thread request, even if an action hasn't been executed
     ActionContext.setContext(null);
     Dispatcher.setInstance(null);
   }
   

3.Yes, If you want that data available in the next action use chain(not suggestible).