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From Pid <...@pidster.com>
Subject Re: NPE at StandardWrapperValve.invoke() in Tomcat 7.0.16
Date Thu, 07 Jul 2011 16:19:19 GMT
On 07/07/2011 01:31, eurotrans-Verlag wrote:
> Hi all,
> 
> I’m using Tomcat 7.0.16 on a system with Java 1.6.0_26 on Windows Serer 2008
> and wondered about a strange NPE I got shortly after deploying a webapp to
> Tomcat:

> SCHWERWIEGEND: An exception or error occurred in the container during the
> request processing
> java.lang.NullPointerException
> 	at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
> va:287)
> 	at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
> va:164)
> 	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.core.StandardEngineValve.invoke(StandardEngineValve.java
> :118)
> 	at
> org.apache.catalina.valves.CrawlerSessionManagerValve.invoke(CrawlerSessionM
> anagerValve.java:172)
> 	at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:403)
> 	at
> org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:284)
> 	at
> org.apache.coyote.ajp.AjpAprProtocol$AjpConnectionHandler.process(AjpAprProt
> ocol.java:146)
> 	at
> org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:
> 1730)
> 	at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.ja
> va:886)
> 	at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:9
> 08)
> 	at java.lang.Thread.run(Thread.java:662)
> 
> 
> From looking at Tomcat 7.0.16's source, I can see that line 287 in
> StandardWrapperValve is inside a catch block:
> 
> 285 	} catch (Throwable e) {
> 286 	    ExceptionUtils.handleThrowable(e);
> 287 	    container.getLogger().error(sm.getString(
> 288 	        "standardWrapper.serviceException", wrapper.getName(),
> 289 	        context.getName()), e);
> 290 	    throwable = e;
> 291 	    exception(request, response, e);
> 292 	}
> 
> So does that mean that another Exception/Error occurred, but was suppressed
> by that NPE and therefore couldn't be logged?

What is the request for and is the config of your Tomcat instance
modified from the original download - if so, what has changed (config etc)?


p



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