code: public void valueUnbound(HttpSessionBindingEvent event) {
  		String sessionId = event.getSession().getId();
  		Debug.logVerbose("[JdonFramework] unvalueBound active, sessionId :" + sessionId, module);
  		Debug.logVerbose("[JdonFramework] unvalueUnbound active, componentsboxs size" + componentsboxsInSession.size(), module);
  		// removeObjects();
  		componentsboxsInSession.clear();
  		if (targetMetaRequestsHolder != null)
  			targetMetaRequestsHolder.clear();
  		targetMetaRequestsHolder = null;
  		componentVisitor = null;
  	}
docs: session destroyed. remove all references;