Question

My questions are:

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

In other words, for every new request a new action object is created. Does this mean every time a new action object is created, a new ActionContext and ValueStack also get created?

2. Consider this scenario:

Action1——1st req——->view.jsp——2nd req———>action2.

So when a request comes for action1 a new object of action1 and corresponding ActionContext and ValueStack will get created.

From view.jsp (upon clicking hyperlink) a new request goes for action2.

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

3. Suppose I store something in ActionContext (of action1) in view.jsp and then click on hyperlink for action2 (from view.jsp), will that data along with the ActionContext (of action1) get lost?

Answer 1

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).