Question

Can anyone explain, if Struts Action classes are threadsafe in Struts 1.x.

• Does RequestProcessor creates new instance of ActionClass for every new request.
• Does it cache the Action classes and reuses it for subsequent requests?

Answer 1

It caches the instance of an Action class and reuses it for subsequent requests.

You can check out the code here: org.apache.struts.action.RequestProcessor.process(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException

So, they are not thread-safe.