invalidation

I opened the session in my servlet when the user performed a successful login: HttpSession session = request.getSession(true); session.setAttribute("name", name); then I wrote in the logout.jsp to terminate the session: <%session.invalidate();%> To check if a session is valid I am doing this: HttpSession session = request.getSession(); String name = (String) session.getAttribute("name"); But it is not working, I am getting the session valid even after the session.invalidate. Does anyone understand where am I doing wrong? you should call session.getSession(false) - which returns null if there

I have a custom view that fills my entire screen. (A piano keyboard) When a user touches the key, it causes invalidate() to be called and the whole keyboard gets redrawn to show the new state with a touched key. Currently the view is very simple, but I plan to add a bit more nice graphics. Since the whole keyboard is dynamically rendered this would make redrawing the entire keyboard more expensive. So I thought, let's look into partial redrawing. Now I call invalidate(Rect dirty) with the correct dirty region. I set my onDraw(Canvas canvas) method to only draw the keys in the dirty region if I

I want to measure/optimize the "cold boot" startup performance of an application, and it's difficult to do this without an actual reboot, which is obviously not an ideal solution. Is there a way I could invalidate entire system's file cache, so that mapped page accesses actually cause a disk access, so that I can measure the time my program takes to start up? Info: I pretty much need FSCTL_DISMOUNT_VOLUME 's functionality, but for the system volume. At least on Windows 7, it seems that attempting to open a volume handle without FILE_SHARE_WRITE sharing permissions causes the file system cache

A project I am working on uses Spring 2.5 & JPA with Hibernate as a provider. My DAO classes extend JpaDaoSupport, so I get my JpaTemplate using the getJpaTemplate() method. The back-end database can get changed either by my application, or a third-party application. When a third-party application changes the database (mostly configuration data changes), I need to provide the user of my application a way to invalidate all JPA sessions and reload the new data (i.e. invalidate all the hibernate sessions in the background). This needs to be "seen" by all concurrent users of my application. How