where can I find reason for this exception message from tomcat?

[tomcat_user <to...@itmax21.com>]

Hi, All,

I have installed tomcat 4.1.24 on windows 2000 server and hardware is
compaq.
And jdk1.3.1_08 has installed.
My web application deployed on the ROOT context of this tomcat and use own
connection pool for MS SQL Server 2000.
The jdbc driver for MS SQL Server2000 are msbase.jar, mssqlserver.jar,
msutil.jar and located
on %JAVA_HOME%\jre\lib\ext.
The web application is working just as interface for user authentication.
It works well about 2-3 weeks after starting tomcat and then suddenly fail
to authenticate user.
User data still on the proper table.
I found exception message from the log file of tomcat and that message is
repeated in a logfile.
Does anybody know what is the meaning of this message?

Exception message is the below.
-------------------------------------
2004-02-06 15:41:05 StandardWrapperValve[default]: Servlet.service() for
servlet default threw exception
java.lang.NullPointerException
 at java.io.File.<init>(Unknown Source)
 at org.apache.naming.resources.FileDirContext.file(FileDirContext.java:880)
 at
org.apache.naming.resources.FileDirContext.getAttributes(FileDirContext.java
:487)
 at
org.apache.naming.resources.BaseDirContext.getAttributes(BaseDirContext.java
:797)
 at
org.apache.naming.resources.ProxyDirContext.cacheLoad(ProxyDirContext.java:1
491)
 at
org.apache.naming.resources.ProxyDirContext.cacheLookup(ProxyDirContext.java
:1412)
 at
org.apache.naming.resources.ProxyDirContext.lookup(ProxyDirContext.java:300)
 at
org.apache.catalina.servlets.DefaultServlet$ResourceInfo.set(DefaultServlet.
java:2267)
 at
org.apache.catalina.servlets.DefaultServlet$ResourceInfo.<init>(DefaultServl
et.java:2219)
 at
org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.jav
a:921)
 at
org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:506)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:247)
 at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:193)
 at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:256)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
 at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:191)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
 at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
 at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180
)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
 at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.
java:171)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:641)
 at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172
)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:641)
 at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:174)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
 at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
 at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
 at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne
ction(Http11Protocol.java:392)
 at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:619)
 at java.lang.Thread.run(Unknown Source)




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