Confusing Error

[Gary Green <sy...@hotmail.com>]

I'm using tomcat version 5.5.7 with jdk 1.5.0_04 on a linux system.  One of 
my apps is giving me the following error when I try to access it.  From 
catalina.out:

SEVERE: Servlet.service() for servlet default threw exception
java.lang.NullPointerException
        at 
org.apache.catalina.servlets.DefaultServlet.renderHtml(DefaultServlet.java:1345)
        at 
org.apache.catalina.servlets.DefaultServlet.render(DefaultServlet.java:1102)
        at 
org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.java:807)
        at 
org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:335)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:738)
        at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:526)
        at 
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:595)


I'm pretty sure it's something with our code, because another version of the 
web app seems to run fine.  The problem is that I can't figure out what this 
error message is telling me and where to start looking.  What exactly does 
this mean?  What problem am I getting?

Thanks for any help.

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