Strange null exception on Tomcat 6.0.18

[slake]

I have a big problem with removing attributes by Tomcat 6.0.18. This happens after migrating from Tomcat 5.5.23 (on this version there wasn't such error). Exception occur occasionally and for now I don't know how to resolve it. Below there is a stack trace from error:

2008-10-16 07:53:52 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet Faces Servlet threw exception
java.lang.NullPointerException
at org.apache.catalina.connector.Request.removeAttrib ute(Request.java:1354)
at org.apache.catalina.connector.RequestFacade.remove Attribute(RequestFacade.java:514)
at org.apache.myfaces.context.servlet.RequestMap.remo veAttribute(RequestMap.java:59)
at org.apache.myfaces.util.AbstractAttributeMap.remov e(AbstractAttributeMap.java:124)
at org.apache.myfaces.el.unified.resolver.FacesCompos iteELResolver.unsetScope(FacesCompositeELResolver. java:163)
at org.apache.myfaces.el.unified.resolver.FacesCompos iteELResolver.invoke(FacesCompositeELResolver.java :152)
at org.apache.myfaces.el.unified.resolver.FacesCompos iteELResolver.getValue(FacesCompositeELResolver.ja va:104)
at org.apache.myfaces.el.VariableResolverToApplicatio nELResolverAdapter.resolveVariable(VariableResolve rToApplicationELResolverAdapter.java:45)
at org.quamasoft.common.servlets.jsf.JsfServletUtils. getManagedBean(JsfServletUtils.java:52)
at org.quamasoft.common.servlets.jsf.JsfServletUtils. getManagedBean(JsfServletUtils.java:57)
at org.quamasoft.server.filters.LicensedActionServlet Filter.doFilter(LicensedActionServletFilter.java:4 9)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at com.uhc.filters.JsfAuthenticationFilter.doFilter(J sfAuthenticationFilter.java:67)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at com.uhc.filters.SessionFilter.doFilter(SessionFilt er.java:115)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at org.quamasoft.server.filters.ServletContextFilter. doFilter(ServletContextFilter.java:69)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11Conn ectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run( JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

Anyone know how to resolve it, please?

[kjkoster]

Dear slake,

Wow, that is very little to go on. Something in the request is null, or maybe the request itself, or something.

I really think this question is better asked on an Apache MyFaces mailing list (http://myfaces.apache.org/mail-lists.html).

Kees Jan

[slake]

Now I'm using Tomcat 6.0.9 problem doesn't occur. It happens only from version 6.0.10 or higher. Maybe it is Tomcat new bug.

Anyway thanks for suggestion.

[kjkoster]

Hmm. If this is a regression in Tomcat, perhaps you can post on the Tomcat dev mailing list. You'll need to provide a bit more detail, though. Like what attribute is involved.

Kees Jan