New to Java

Hi

I occasionally get this error message and it is now happening more frequently. Does anyone have any idea what I need to do to get this fixed. I am not a programmer, but have managed to maintain my server for the last few years since my IT folks left for other pastures. I recently (May 08) swapped to a new server which use PLESk as the control manager. I never got this message before when I only used unix. ie I did not have a control panel, and managed to maintain that server since 2002.


I am using tomcat 5.5.2x. I am wondering if this is caused by conflicts somewhere within the httpd.conf and httpd.include files

19-Sep-08 9:54:36 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet invoker threw exception
java.lang.NullPointerException
at auth.doGet(auth.java:93)
at auth.doPost(auth.java:33)
at javax.servlet.http.HttpServlet.service(tomcat5-servlet-2.4-api-5.5.23.jar.so)
at javax.servlet.http.HttpServlet.service(tomcat5-servlet-2.4-api-5.5.23.jar.so)
at org.apache.catalina.servlets.InvokerServlet.serveRequest(servlets-invoker-5.5.23.jar.so)
at org.apache.catalina.servlets.InvokerServlet.doPost(servlets-invoker-5.5.23.jar.so)
at javax.servlet.http.HttpServlet.service(tomcat5-servlet-2.4-api-5.5.23.jar.so)
at javax.servlet.http.HttpServlet.service(tomcat5-servlet-2.4-api-5.5.23.jar.so)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(catalina-5.5.23.jar.so)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(catalina-5.5.23.jar.so)
at org.apache.catalina.core.StandardWrapperValve.invoke(catalina-5.5.23.jar.so)
at org.apache.catalina.core.StandardContextValve.invoke(catalina-5.5.23.jar.so)
at org.apache.catalina.core.StandardHostValve.invoke(catalina-5.5.23.jar.so)
at org.apache.catalina.valves.ErrorReportValve.invoke(catalina-5.5.23.jar.so)
at org.apache.catalina.core.StandardEngineValve.invoke(catalina-5.5.23.jar.so)
at org.apache.catalina.connector.CoyoteAdapter.service(catalina-5.5.23.jar.so)
at org.apache.coyote.http11.Http11Processor.process(tomcat-http-5.5.23.jar.so)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(tomcat-http-5.5.23.jar.so)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(tomcat-util-5.5.23.jar.so)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(tomcat-util-5.5.23.jar.so)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(tomcat-util-5.5.23.jar.so)
at java.lang.Thread.run(libgcj.so.7rh)

Would really appreciate your help

Thanks