On Wed, Sep 25, 2013 at 7:29 AM, Muniasamy Kanthasamy wrote: > CGI will do that. But Struts/servlet has designed to overcome that. > It will create one service and serve for all requests >
Servlets and Struts 1 actions are instantiated "once" (not strictly true, but in general). Struts 2 actions are instantiated per-request, unless you're using Spring and configured them to be singleton (as opposed to, say, prototype) scope. Simple object instantiation is generally phenomenally cheap across JVMs. Care should still be taken to make sure only things that need to be initialized are actually initialized, but action instantiation is pretty quick, and it solves a variety of issues that singletons have. Which is "best" is likely debatable, and I still go back-and-forth in my head about it. Dave
