I think you should comment out those lines where you're throwing
UnsupportedOperationException.

-- 
Regards,
Artashes Hovasapyan


On Tue, Mar 10, 2009 at 5:59 AM, <ketul....@gmail.com> wrote:

>
> *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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