Class HttpSessionMutexListener

  • java.lang.Object
    • org.springframework.web.util.HttpSessionMutexListener
  • All Implemented Interfaces:
    java.util.EventListener, HttpSessionListener

    public class HttpSessionMutexListener
    extends java.lang.Object
    implements HttpSessionListener
    Servlet HttpSessionListener that automatically exposes the session mutex when an HttpSession gets created. To be registered as a listener in web.xml.

    The session mutex is guaranteed to be the same object during the entire lifetime of the session, available under the key defined by the SESSION_MUTEX_ATTRIBUTE constant. It serves as a safe reference to synchronize on for locking on the current session.

    In many cases, the HttpSession reference itself is a safe mutex as well, since it will always be the same object reference for the same active logical session. However, this is not guaranteed across different servlet containers; the only 100% safe way is a session mutex.

    Juergen Hoeller
    See Also:
    WebUtils.SESSION_MUTEX_ATTRIBUTE, WebUtils.getSessionMutex(javax.servlet.http.HttpSession), AbstractController.setSynchronizeOnSession(boolean)