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Listener is one of the most popular technologies used in the J2EE web application. It is part of the Java Servlet as defined in Servlet 2.3 but they have their own specific functionalities. There are two most widely used Servlet Listener i.e. ServletContextListener and HttpSessionListener. By the end of this tutorial, you are expected to be able to implement ServletContextListener as well as HttpSessionListener and able to customize them based on your needs. Additionally, it would be good if you have some basic knowledge on general J2EE web application such as JSP, Java Servlet and NetBeans.