Please if anyone can help me to solve below errors !
---------------------------------------------------------------------------------------------------------
*Errors:
java.lang.NullPointerException
at mypackage.MyOwnEventListener.attributeAdded
(MyOwnEventListener.java:33)
at org.apache.catalina.session.StandardSession.setAttribute
(StandardSession.java:1706)
at
org.apache.catalina.session.StandardSessionFacade.setAttribute
(StandardSessionFacade.java:163)
at servlets.GreetingServlet.doGet(GreetingServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:
718)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:
831)
-----------------------------------------------------------------------------------------------------
* MyOwnEventListener
public void attributeAdded(HttpSessionBindingEvent evt) {
servletContext = evt.getServletContext();
servletContext.log("attributeAdded(HttpSessionBindingEvent se)
method is invoked");
throw new UnsupportedOperationException("Not supported yet.");
}
public void attributeRemoved(HttpSessionBindingEvent se) {
servletContext = se.getServletContext();
servletContext.log("attributeRemoved(HttpSessionBindingEvent
se)method is invoked");
throw new UnsupportedOperationException("Not supported yet.");
}
-------------------------------------------------------------------------------------------------------
*GreetingServlet.java
HttpSession session = request.getSession();
session.setAttribute("att","attribute1");
---------------------------------------------------------------------------------
* ResponseServlet.java
request.getSession().removeAttribute("att");
request.getSession().invalidate();
-----------------------------------------------------------
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