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Java Forum / General / January 2007Instantiate expensive object *once* in JSP/Tomcat
I have an object that is very expensive in terms of time (it reads in an XML mapping file). How do I load this object into memory once - and once only - when the server starts? How do I access this object in my standard JSP code? > I have an object that is very expensive in terms of time (it reads in an XML > mapping file). > > How do I load this object into memory once - and once only - when the server > starts? How do I access this object in my standard JSP code? One idea: - make it a singleton - create a startup servlet that references it Arne >> I have an object that is very expensive in terms of time (it reads in >> an XML mapping file). [quoted text clipped - 5 lines] > - make it a singleton > - create a startup servlet that references it A more proper solution is to implement the interface that listens to application events. The startup event would create that object and place it in the web application's context while the shutdown even would trigger cleanup code. Kind regards robert >>> I have an object that is very expensive in terms of time (it reads in >>> an XML mapping file). [quoted text clipped - 10 lines] > place it in the web application's context while the shutdown even would > trigger cleanup code. Regarding application context instead of singleton: then in general that is a very bad design because all the code using it becomes tied to being used in web app context. If it is only to be used in JSP pages then no problem, they are already tied to web app context. Regarding ServletContextListener instead of startup servlet: fine. Arne >>>> How do I load this object into memory once - and once only - when >>>> the server starts? How do I access this object in my standard JSP code? >> A more proper solution is to implement the interface that listens to >> application events. The startup event would create that object and [quoted text clipped - 6 lines] > in JSP pages then no problem, they are already tied to web app > context. That's the exact reason why I proposed this approach here: OP asked for access from JSP code. :-) Kind regards robert Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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