> Maybe I can reproduce the
> NPE if I make a servlet that takes a long time to finish the request,
> to see what was the original exception that has been suppressed by the
> NPE.
OK, I was able to reproduce a NPE in TC 7.0.16 with a Servlet that calls
"Thread.sleep(20000)", then make a request to that servlet and immediately
redeploy that webapp. However, this time the NPE was not in
StandardWrapperValve.invoke(), but in StandardContextValve.invoke():
08.07.2011 00:26:40 org.apache.catalina.connector.CoyoteAdapter service
SCHWERWIEGEND: An exception or error occurred in the container during the
request processing
java.lang.NullPointerException
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:403)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:301)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:162)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:140)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown
Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
The lines around 172 in StandardContextValve are these:
166 // If the request was async at the start and an error occurred then
167 // the async error handling will kick-in and that will fire the
168 // request destroyed event *after* the error handling has taken
169 // place
170 if (!(request.isAsync() || (asyncAtStart && request.getAttribute(
171 RequestDispatcher.ERROR_EXCEPTION) != null))) {
172 context.fireRequestDestroyEvent(request);
173 }
The problem here is that "context" is null (I debugged TC in Eclipse). However,
this time it seems that it is not another Exception that has been suppressed by
a NPE.
I checked that the NPE in StandardContextValve.invoke() also occurs in Tomcat
7.0.18.
Unfortunately, I was not able to reproduce the NPE in
StandardWrapperValve.invoke().
Regards,
Konstantin Preißer
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