*Please anyone can help me what is wrong in my code
*I am getting error CODE i have pasted below line
*Appreciate in advance
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)
-------------------------------------------------------------------------------------------------------------------------------------------------------------------
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 evt) {
servletContext.log("attributeAdded(HttpSessionBindingEvent se)
method is invoked");
throw new UnsupportedOperationException("Not supported yet.");
}
request.getSession().removeAttribute("att");
//request.getSession().invalidate();
HttpSession session = request.getSession();
if (session != null)
session.setAttribute("att","attribute1");
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