When sessionDestroyed is called?
A servlet engine will handle session timeouts. It will determine on its own when the session is no longer valid and it will call the sessionDestroyed . (this can occur some time after the user closed his browser).
What is the use of HttpSessionListener?
HttpSessionListener can be used to get notified when a HTTP session is created and destroyed. For that we need to implement the methods; sessionCreated() and sessionDestroyed() respectively. HttpSessionListener#sessionCreated() is invoked when a new session is created via HttpServletRequest#getSession() method.
How HttpSessionListener works?
The HttpSessionEvent is notified when session object is changed. The corresponding Listener interface for this event is HttpSessionListener. We can perform some operations at this event such as counting total and current logged-in users, maintaing a log of user details such as login time, logout time etc.
What is Servletcontextlistener?
void contextInitialized(ServletContextEvent sce) Receives notification that the web application initialization process is starting. All ServletContextListeners are notified of context initialization before any filters or servlets in the web application are initialized.
How do I use HttpSessionBindingListener?
HttpSessionBindingListener can be implemented by a class to get notified when its instance is added to the session or when it is removed from the session. HttpSessionBindingListener#valueBound() is invoked when this object is added to the session by the use of HttpSession. setAttribute() .
What is HttpSessionEvent?
Class HttpSessionEvent This is the class representing event notifications for changes to sessions within a web application.
What is HttpSessionListener interface?
public interface HttpSessionListener extends EventListener. Interface for receiving notification events about HttpSession lifecycle changes.
What is contextInitialized?
contextInitialized. void contextInitialized(ServletContextEvent sce) Receives notification that the web application initialization process is starting. All ServletContextListeners are notified of context initialization before any filters or servlets in the web application are initialized.
What is ServletContextEvent in Java?
Class ServletContextEvent This is the event class for notifications about changes to the servlet context of a web application.
What is HttpSessionBindingEvent?
valueBound(HttpSessionBindingEvent event) Notifies the object that it is being bound to a session and identifies the session.
What is ServletContext object?
public interface ServletContext. Defines a set of methods that a servlet uses to communicate with its servlet container, for example, to get the MIME type of a file, dispatch requests, or write to a log file. There is one context per “web application” per Java Virtual Machine.
What is session listener?
A session listener receives notifications when a session is created or destroyed. This is useful for logging, or to maintain a list of all active sessions. This is also useful when writing a distributable web application, to ensure that session replication to other members of the cluster is working as expected.
What is a ServletContextListener?
ServletContextListener is an interface that gets notified about ServletContext lifecycle changes. It offers two methods. contextInitialized – Is triggered when the web application is starting the initialization. This will be invoked before any of the filters and servlets are initialized.
What is ServletContext and ServletConfig?
ServletConfig is used for sharing init parameters specific to a servlet while ServletContext is for sharing init parameters within any Servlet within a web application.
What is @ServletComponentScan?
Annotation Type ServletComponentScan Enables scanning for Servlet components ( filters , servlets , and listeners ). Scanning is only performed when using an embedded web server. Typically, one of value , basePackages , or basePackageClasses should be specified to control the packages to be scanned for components.