Bugs item #1507512, was opened at 2006-06-16 21:57
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Category: examples
Group: 1.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Rüdiger Schulz (mindhaq)
Assigned to: Nobody/Anonymous (nobody)
Summary: NullPointerException in Breadcrumb Demo
Initial Comment:
Not entirely sure how to replicate this, but
I put wicket-examples-1.2.jar into Tomcat 5.5.15's
webapps directory, JDK 1.5.0_06
When I do the following in the breadcrumbs example, I
get an NPE.
Breadcrumbs - go to second panel - update and display
result - first - [Firefox/Opera Backbutton] - second
On MSIE I get the NPE when I press the Backbutton, but
I think this has to do with caching.
Here's the stacktrace; might be more of a bug in wicket
than in the example...
ERROR - RequestCycle -
java.lang.NullPointerException
at
wicket.extensions.breadcrumb.panel.BreadCrumbPanel.onActivate(BreadCrumbPanel.java:176)
at
wicket.extensions.breadcrumb.BreadCrumbBar.activate(BreadCrumbBar.java:389)
at
wicket.extensions.breadcrumb.BreadCrumbBar.setActive(BreadCrumbBar.java:367)
at
wicket.extensions.breadcrumb.BreadCrumbLink$1.undo(BreadCrumbLink.java:83)
at
wicket.version.undo.ChangeList.undo(ChangeList.java:93)
at
wicket.version.undo.UndoPageVersionManager.undo(UndoPageVersionManager.java:217)
at
wicket.version.undo.UndoPageVersionManager.getVersion(UndoPageVersionManager.java:167)
at wicket.Page.getVersion(Page.java:592)
at wicket.PageMap.get(PageMap.java:454)
at wicket.Session.getPage(Session.java:413)
at
wicket.request.compound.DefaultRequestTargetResolverStrategy.resolveRenderedPage(DefaultRequestTargetResolverStrategy.java:149)
at
wicket.request.compound.DefaultRequestTargetResolverStrategy.resolve(DefaultRequestTargetResolverStrategy.java:92)
at
wicket.request.compound.AbstractCompoundRequestCycleProcessor.resolve(AbstractCompoundRequestCycleProcessor.java:48)
at wicket.RequestCycle.step(RequestCycle.java:942)
at wicket.RequestCycle.steps(RequestCycle.java:1034)
at wicket.RequestCycle.request(RequestCycle.java:453)
at
wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:215)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
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:595)
----------------------------------------------------------------------
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