Completely unhelpful NullPointerException in spring FrameworkServlet

I'm getting the below completely unhelpful NullPointerException during tomcat startup. I just don't know where would I start looking at - java classes, jsp files, spring definitions, or ?
Can someone throw some light please.

- Servlet.service() for servlet arcotadmin threw exception
java.lang.NullPointerException
            at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:548)
            at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:453)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
            at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
            at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
            at com.arcot.admin.framework.web.utils.FrameworkSessionFilter.doFilter(FrameworkSessionFilter.java:71)
            at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
            at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
            at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
            at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
            at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
            at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
            at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
            at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
            at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
            at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
            at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
            at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
            at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
            at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
            at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
            at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
            at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
            at java.lang.Thread.run(Thread.java:595)


thanks
kannan

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