Jay Burgess wrote:
Our app currently throws a custom UnavailableException from a couple of places inside our Action handlers when the app is "offline" doing end-of-day processing. We thought we had this situation covered from the UI perspective, as we'd configured the following mapping in our web.xml:<error-page> <exception-type>UnavailableException</exception-type> <location>/unavailable.jsp</location> </error-page> However, our end-of-day processing now shuts down our web server, which causes the webapp to unload, and the unavailable.jsp to become inaccessible. The problem I've got is that if the user tries to access the webapp between the time it has started unloading and the time the web server goes down, instead of our unavailable.jsp, the user sees an ugly HTTP 500 error and a stack trace. What I'd like to do, as it affects the smallest amount of code, is something like the following: <error-page> <exception-type>UnavailableException</exception-type> <error-code>503</error-code> </error-page> That is, if the container catches the UnavailableException, generate a standard HTTP 503 error back to the browser. Is something like this possible to do in web.xml? (I don't see it in the DTD.) Or is my only option to catch the exception myself and do something like HttpServletResponse.sendError(SC_SERVICE_UNAVAILABLE) in the code?
I think you're going to be out of luck there. The first thing the container does when asked to undeploy a web application is to stop forwarding requests to it... In other words, for the requests you're interested in, there is nowhere you can place a 'catch'.
You really need to either a) avoid shutting down the container, or b) use some type of load-balancing or other HA techniques to switch request processing to some temporary HTTP server before shutting down the container, so you can guarantee that all requests are served by a container that's in a consistent, live state.
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