webapp inaccessible - "SEVERE" error in catalina.out

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our users reported that a webapp was handing back "resource unavailable" 
errors when accessing a servlet.  this was in catalina.out:

org.apache.coyote.tomcat5.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the 
request processing
java.lang.NullPointerException
        at 
org.apache.tomcat.util.http.mapper.Mapper.internalMapWrapper(Mapper.java:712)
        at 
org.apache.tomcat.util.http.mapper.Mapper.internalMap(Mapper.java:627)
        at org.apache.tomcat.util.http.mapper.Mapper.map(Mapper.java:517)
        at 
org.apache.coyote.tomcat5.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:298)
        at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:201)
        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:647)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:497)
        at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:575)
        at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:649)
        at java.lang.Thread.run(Thread.java:534)

we're using tomcat5 - i believe the version is the one prior to 5.0.16. 
 we're not using any servlets, and we're using Velocity.  Java version 
is build 1.4.2_01-b06.

any idea what this might be?

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