Simple question about JSF configuration

I am using Tomcat 5.0 in Windows XP SP2. When I create a web application with JSF and put it into {tomcat_home}\webapps\, everything works perfect. But when I add a context path in Tomcat's server.xml such like
<Context docBase="C:\works\java_projects\jsf_test" path="/jsf_test" reloadable="true" debug="0"/>
And then I put same web application into this context path and try the url like http://machinename:8080/jsf_test/test.faces, it gives me exception as follow
I wonder if anyone knows about that? Thanks a lot!!
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Servlet.init() for servlet Faces Servlet threw exception
     org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
     org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
     org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
     org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
     java.lang.Thread.run(Thread.java:595)
root cause
java.lang.NullPointerException
     javax.faces.webapp.FacesServlet.init(FacesServlet.java:144)
     org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
     org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
     org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
     org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
     java.lang.Thread.run(Thread.java:595)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
:

FacesServlet.init() processes only the followings: facesContextFactory = FactoryFinder.getFactory(FACES_CONTEXT_FACTORY);
applicationFactory = FactoryFinder.getFactory(APPLICATION_FACTORY);
application = applicationFactory.getApplication();
lifecycleFactory = FactoryFinder.getFactory(LIFECYCLE_FACTORY);
lifecycle = lifecycleFactory.getLifecycle(lifecycleId);NPE occurrs at the third line when it can't find ApplicationFactory.
Check how your container loads the class.

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