Today my production system threw a NullPointerException:
(See stack trace below)

This is with wicket 1.2 final (for line-number references).
The line the NPE occured is:

"session.removeAttribute(attributeForId(entry.getNumericId()));"

i don't have any customized stuff here, nor do i have more than one
pagemap, so i'm tempted to declare this as a reace condition-triggered
bug. (because it just occured today, after 4 weeks without problems, but
today the app was quite busy, lots of concurrent requests...)

Any ideas?

Rgds,

Marco


2006-07-21 10:04:07,035 ERROR [wicket.RequestCycle]
java.lang.NullPointerException
        at wicket.PageMap.removeEntry(PageMap.java:335)
        at wicket.PageMap.access(PageMap.java:635)
        at wicket.PageMap.get(PageMap.java:459)
        at wicket.Session.getPage(Session.java:413)
        at
wicket.request.compound.DefaultRequestTargetResolverStrategy.resolveRenderedPage(DefaultRequestTargetResolverStrategy.java:149)
        at
wicket.request.compound.DefaultRequestTargetResolverStrategy.resolve(DefaultRequestTargetResolverStrategy.java:92)
        at
wicket.request.compound.AbstractCompoundRequestCycleProcessor.resolve(AbstractCompoundRequestCycleProcessor.java:48)
        at wicket.RequestCycle.step(RequestCycle.java:942)
        at wicket.RequestCycle.steps(RequestCycle.java:1034)
        at wicket.RequestCycle.request(RequestCycle.java:453)
        at wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:215)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at
de.eyetea.hfax.monitoring.BieterSessionFilter.doFilter(BieterSessionFilter.java:126)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at de.eyetea.TargetFilter.doFilter(TargetFilter.java:47)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:54)
        at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:174)
        at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
        at
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
        at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
        at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:797)


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