One possible reason for the NullPointerException could be that you are not
checking for null in your code.
Try the following :
After retrieving an object from the session check for null before calling
the toString() method on it.
Assume this will put you in the right direction to solving your problem.
Have a nice day.
With regards,
Sachin S. Khanna.
www.emailanorder.com
----- Original Message -----
From: Sello Mathibe <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, March 12, 2001 7:11 PM
Subject: Re: Internal Server Error
> Thanks. The following JSP I use to call either LeaveForm.jsp or
> busUnManResp.jsp. Whenever I call it, I get the error that follows the
code.
>
> <%@ page contentType="text/html;charset=WINDOWS-1252"%>
> <FRAMESET COLS="100%,0%" ROWS = "60%,40%">
> <%if (!session.getAttribute("serNo").toString().equals("")) {%>
> <FRAME
> SRC="LeaveForm.jsp?serNo=<%=session.getAttribute("serNo")%>">
> <FRAME SRC="">
> <FRAME
SRC="BusUnManRep.jsp?serNo=<%=session.getAttribute("serNo")%>">
> <%}else if
> (session.getAttribute("typeOf").toString().equals("BusinessUnitManager")||
> (
> (session.getAttribute("typeOf").toString().equals("NormalEmployee"))&&
>
(!request.getParameter("serNo").toString().equals("")) ) ){%>
> <FRAME
SRC="LeaveForm.jsp?serNo=<%=request.getParameter("serNo")%>">
> <FRAME SRC="">
> <FRAME
> SRC="BusUnManRep.jsp?serNo=<%=request.getParameter("serNo") %>">
> <%} else {%>
> <FRAME SRC="LeaveForm.jsp?serNo=""">
> <FRAME SRC="">
> <FRAME SRC="BusUnManRep.jsp?serNo=""">
> <%}%>
> </frameset>
>
> The ERROR:
>
> Error: 500
> Location: /LeaveForm/BusUnManRep.jsp
> Internal Servlet Error:
>
> org.apache.jasper.JasperException: Unable to compile class for JSP
> void
>
org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletR
> equest, javax.servlet.http.HttpServletResponse)
> void
> javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest,
> javax.servlet.ServletResponse)
> void
>
org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Reque
> st, org.apache.tomcat.core.Response)
> void
> org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request,
> org.apache.tomcat.core.Response)
> void
>
org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request
> , org.apache.tomcat.core.Response)
> void
>
org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core
> .Request, org.apache.tomcat.core.Response)
> void
>
org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request
> , org.apache.tomcat.core.Response)
> void
>
org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection
> (org.apache.tomcat.service.TcpConnection, java.lang.Object[])
> void
> org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
> void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
> void java.lang.Thread.run()
>
> Root cause:
> java.lang.NullPointerException
> void
>
org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletR
> equest, javax.servlet.http.HttpServletResponse)
> void
> javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest,
> javax.servlet.ServletResponse)
> void
>
org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Reque
> st, org.apache.tomcat.core.Response)
> void
> org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request,
> org.apache.tomcat.core.Response)
> void
>
org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request
> , org.apache.tomcat.core.Response)
> void
>
org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core
> .Request, org.apache.tomcat.core.Response)
> void
>
org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request
> , org.apache.tomcat.core.Response)
> void
>
org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection
> (org.apache.tomcat.service.TcpConnection, java.lang.Object[])
> void
> org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
> void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
> void java.lang.Thread.run()
>
>
>
>
> -----Original Message-----
> From: Sachin S. Khanna [mailto:[EMAIL PROTECTED]]
> Sent: 12 March 2001 12:26
> To: [EMAIL PROTECTED]
> Subject: Re: Internal Server Error
>
>
> Well if you go through the error that is being generated you fill find
that
> it states that the root cause for the error is
> java.lang.NullPointerException.
> If you provide us the code we might be able to help you further.
> Have a nice day.
> With regards,
> Sachin S. Khanna.
> www.emailanorder.com
>
> ----- Original Message -----
> From: Sello Mathibe <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Monday, March 12, 2001 3:00 PM
> Subject: Internal Server Error
>
>
> > Hi Gurus! I'm still a newbie to JSPs and Servlets, can you please tell
me
> > what the error below means. I'm currently running NT 4, Apache + Tomcat.
I
> > get the error when I try to access the JSP page. I've defined my
servlets
> in
> > my web.xml and server.xml. All the other JSPs are running quite good
> except
> > for the other one. I think the problem might be with the
> > org.apache.jasper.JasperException.
> > Can somebody out there help me? I will really appreciate it.
> > Thank You
> > Error: 500
> > Location: /LeaveForm/BusUnManRep.jsp
> > Internal Servlet Error:
> > org.apache.jasper.JasperException: Unable to compile class for JSP
> > void
> >
>
org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletR
> > equest, javax.servlet.http.HttpServletResponse)
> > void
> > javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest,
> > javax.servlet.ServletResponse)
> > void
> >
>
org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Reque
> > st, org.apache.tomcat.core.Response)
> > void
> > org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request,
> > org.apache.tomcat.core.Response)
> > void
> >
>
org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request
> > , org.apache.tomcat.core.Response)
> > void
> >
>
org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core
> > .Request, org.apache.tomcat.core.Response)
> > void
> >
>
org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request
> > , org.apache.tomcat.core.Response)
> > void
> >
>
org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection
> > (org.apache.tomcat.service.TcpConnection, java.lang.Object[])
> > void
> > org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
> > void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
> > void java.lang.Thread.run()
> > Root cause:
> > java.lang.NullPointerException
> > void
> >
>
org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletR
> > equest, javax.servlet.http.HttpServletResponse)
> > void
> > javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest,
> > javax.servlet.ServletResponse)
> > void
> >
>
org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Reque
> > st, org.apache.tomcat.core.Response)
> > void
> > org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request,
> > org.apache.tomcat.core.Response)
> > void
> >
>
org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request
> > , org.apache.tomcat.core.Response)
> > void
> >
>
org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core
> > .Request, org.apache.tomcat.core.Response)
> > void
> >
>
org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request
> > , org.apache.tomcat.core.Response)
> > void
> >
>
org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection
> > (org.apache.tomcat.service.TcpConnection, java.lang.Object[])
> > void
> > org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
> > void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
> > void java.lang.Thread.run()
> >
> >
>
===========================================================================
> > To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff
> JSP-INTEREST".
> > For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST
> DIGEST".
> > Some relevant FAQs on JSP/Servlets can be found at:
> >
> > http://java.sun.com/products/jsp/faq.html
> > http://www.esperanto.org.nz/jsp/jspfaq.html
> > http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> > http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
> >
>
>
===========================================================================
> To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff
> JSP-INTEREST".
> For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST
> DIGEST".
> Some relevant FAQs on JSP/Servlets can be found at:
>
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
>
>
===========================================================================
> To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff
JSP-INTEREST".
> For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST
DIGEST".
> Some relevant FAQs on JSP/Servlets can be found at:
>
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
>
===========================================================================
To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST".
For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST".
Some relevant FAQs on JSP/Servlets can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
