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From Remy Maucherat <r...@jboss.org>
Subject Re: Strange tomcat behavior
Date Thu, 09 Oct 2003 14:24:00 GMT
ralf.bechtel@optisoft.de wrote:
> Hi everybody on the list!
> 
> We observed a strange tomcat behavior (tomcat 4.1.24) while running a servlet: Everything
works fine some days or even weeks. Suddenly (and at random time) tomcat throws the following
exceptions:
> 
> 2003-10-08 11:44:48 CoyoteAdapter An exception or error occurred in the container during
the request processing
> java.lang.NullPointerException
> 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:164)
> 	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
> 	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
> 	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> 	at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
> 	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
> 	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
> 	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
> 	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
> 	at java.lang.Thread.run(Thread.java:484)
> 
> This exception occurs some times. Suddenly tomcat throws another exception:
> 
> 2003-10-08 11:46:44 CoyoteAdapter An exception or error occurred in the container during
the request processing
> java.lang.NullPointerException
> 	at java.lang.String.charAt(String.java:509)
> 	at org.apache.tomcat.util.buf.ByteChunk.indexOf(ByteChunk.java:669)
> 	at org.apache.coyote.tomcat4.CoyoteAdapter.normalize(CoyoteAdapter.java:578)
> 	at org.apache.coyote.tomcat4.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:280)
> 	at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:221)
> 	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
> 	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
> 	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
> 	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
> 	at java.lang.Thread.run(Thread.java:484)
> 
> Note that there are no user defined classes in the stacktrace.  What's the reason of
this behavior?

The second one was weirder, so I looked into it:

For the TC 4.1.24 source:

CoyoteAdapter.java:578: index = uriBC.indexOf("/../", 0, 4, index);
For reference: ByteChunk.java:668: public int indexOf( String src, int 
srcOff, int srcLen, int myOff ) {
ByteChunk.java:669: char first=src.charAt( srcOff );

If you get a NPE inside charAt on a constant String, I think it means 
your VM has issues.

For the first one, the engine associated with the engine valve is null, 
which can't happen either, but I can't demonstrate as easily that it's 
not a Tomcat bug.

-- 
xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Rémy Maucherat
Senior Developer & Consultant
JBoss Group (Europe) SàRL
xxxxxxxxxxxxxxxxxxxxxxxxxxxxx


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