Uncaught servlet exception

Question

Hi,
Am getting this following error immediately after my JSP page loads
com.ibm.ws.webcontainer.servlet.exception.UncaughtServletException: Server caught unhandled exception from servlet [file]: null
     at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java(Compiled Code))
     at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java(Compiled Code))
     at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java(Compiled Code))
     at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java(Compiled Code))
     at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java(Compiled Code))
     at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java(Compiled Code))
     at com.ibm.ws.webcontainer.cache.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:120)
     at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java(Compiled Code))
     at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java(Compiled Code))
     at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java(Compiled Code))
     at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java(Compiled Code))
     at com.ibm.ws.http.HttpConnection.run(HttpConnection.java(Compiled Code))
     at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java(Compiled Code))
No stack trace is available. Guess there is some problem in the JSP. basically am calling a servlet on load of this JSP.This is the code snippet which calls the servlet.Please help me out if anybody have any idea.
<%
     String dateSuffix = (String)session.getAttribute(
          VSRMPresentationLayerConstants.FILE_NAME);
     String attributeName = (String)session.getAttribute(
          VSRMPresentationLayerConstants.GROUP_NAME);
     String path = request.getContextPath()+"/exportGroupMembers.file?fileName="+
ManagerConstants.GROUP_REPORT_FILE_LOCATION+attributeName+"_"+dateSuffix+"&download=group&display="+attributeName+"_"+dateSuffix;
%>

Answer 1

Most probably it is a null pointer exception.
Most things that have "null" for an error message are.
As to what is null, that is anyones guess, but most probably one of the session attributes.
I'm against scriptlets in JSPs as a matter of course, but this may help a little:
<%
try {
  String dateSuffix = (String)session.getAttribute(VSRMPresentationLayerConstants.FILE_NAME);
  String attributeName = (String)session.getAttribute(VSRMPresentationLayerConstants.GROUP_NAME);
  String path = request.getContextPath()+"/exportGroupMembers.file?fileName="+ManagerConstants.GROUP_REPORT_FILE_LOCATION+attributeName+"_"+dateSuffix+"&download=group&display="+attributeName+"_"+dateSuffix;
catch (Throwable t){
  System.err.println("The error is " + e.getMessage());
  e.printStackTrace();
  throw e;
%>It should at least give you an indication of what the error is, and where it is approximately in your JSP.