I downloaded the app at http://tobago.atanion.net/tobago-example-demo.war
 and turned on logging.  I could not seem to reproduce the problem on the "tree 
control" page, but this is what I get when click around on the tabs in under 
"tab control" .

ERROR 
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/tobago-example-demo].[jsp]
 - Servlet.service() fo
r servlet jsp threw exception
java.lang.NullPointerException
        at 
org.apache.myfaces.taglib.core.ViewTag.setProperties(ViewTag.java:220)
        at 
javax.faces.webapp.UIComponentTag.findComponent(UIComponentTag.java:361)
        at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:219)
        at org.apache.myfaces.taglib.core.ViewTag.doStartTag(ViewTag.java:71)
        at 
org.apache.jsp.tag.web.layout.overview_tag._jspx_meth_f_view_0(org.apache.jsp.tag.web.layout.overview_tag:10
9)
        at 
org.apache.jsp.tag.web.layout.overview_tag.doTag(org.apache.jsp.tag.web.layout.overview_tag:81)
        at 
org.apache.jsp.overview.tabControl_jsp._jspx_meth_layout_overview_0(org.apache.jsp.overview.tabControl_jsp:1
41)
        at 
org.apache.jsp.overview.tabControl_jsp._jspService(org.apache.jsp.overview.tabControl_jsp:117)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
        at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
        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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
        at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
        at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
        at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
        at 
org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:415)
        at 
org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:234)
        at 
org.apache.myfaces.tobago.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:116)
        at 
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:352)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at 
org.apache.myfaces.tobago.webapp.TobagoMultipartFormdataFilter.doFilter(TobagoMultipartFormdataFilter.java:8
1)
        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.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:856)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
        at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at 
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:595)
ERROR org.apache.myfaces.tobago.application.ViewHandlerImpl - requestUri 
'/overview/tabControl.jsp'
javax.faces.FacesException: javax.servlet.jsp.JspException: null
        at 
org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:421)
        at 
org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:234)
        at 
org.apache.myfaces.tobago.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:116)
        at 
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:352)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at 
org.apache.myfaces.tobago.webapp.TobagoMultipartFormdataFilter.doFilter(TobagoMultipartFormdataFilter.java:8
1)
        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.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:856)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
        at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at 
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:595)
Caused by: javax.servlet.ServletException: javax.servlet.jsp.JspException: null
        at 
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:844)
        at 
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
        at 
org.apache.jsp.overview.tabControl_jsp._jspService(org.apache.jsp.overview.tabControl_jsp:126)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
        at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
        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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
        at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
        at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
        at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
        at 
org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:415)
        ... 21 more
ERROR 
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/tobago-example-demo].[FacesServlet]
 - Servlet.ser
vice() for servlet FacesServlet threw exception
javax.faces.FacesException: javax.faces.FacesException: 
javax.servlet.jsp.JspException: null
        at 
org.apache.myfaces.tobago.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:148)
        at 
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:352)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at 
org.apache.myfaces.tobago.webapp.TobagoMultipartFormdataFilter.doFilter(TobagoMultipartFormdataFilter.java:8
1)
        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.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:856)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
        at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at 
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:595)
Caused by: javax.faces.FacesException: javax.servlet.jsp.JspException: null
        at 
org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:421)
        at 
org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:234)
        at 
org.apache.myfaces.tobago.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:116)
        ... 19 more
Caused by: javax.servlet.ServletException: javax.servlet.jsp.JspException: null
        at 
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:844)
        at 
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
        at 
org.apache.jsp.overview.tabControl_jsp._jspService(org.apache.jsp.overview.tabControl_jsp:126)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
        at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
        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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
        at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
        at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
        at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
        at 
org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:415)

>-----Original Message-----
>From: Matthias Wessendorf [mailto:[EMAIL PROTECTED]
>Sent: Saturday, December 31, 2005 07:22 AM
>To: 'MyFaces Discussion'
>Subject: Re: tobago examples
>
>I just tried the same in firefox... and again, can`t reproduce
>
>On 12/30/05, Dennis Byrne <[EMAIL PROTECTED]> wrote:
>> Hi Bernd,
>>
>> I am afraid I can still produce this one :(  I went to 
>> http://tobago.atanion.net/tobago-example-demo/ , clicked on "Tree Control", 
>> and then clicked on "ListBox".  This produced a 404 for the following page:
>>
>> http://tobago.atanion.net/tobago-example-demo/faces/overview/treeControl.jsp
>>
>> By the way, it seems to only mess things up for the current session.  In 
>> other words, you will get a 404 the whole app using the session in which the 
>> first 404 occurred.  Making a new browser window (and a new session), allows 
>> you to browse the site again.  After doing this, I was able to click back 
>> and forth between the "Listbox" and "Tree" tabs just fine.
>>
>> I also produced a 404 for the following URL in the "Tab Control" section.
>>
>> http://tobago.atanion.net/tobago-example-demo/faces/overview/tabControl.jsp
>>
>> It takes more time and clicking to make this one happen.  I cannot recognize 
>> any pattern.  I first saw this using the .war file you posted a link to a 
>> week or two ago.  I seem to remember seeing a NPE somewhere.  Sorry.
>>
>> >-----Original Message-----
>> >From: Bernd Bohmann [mailto:[EMAIL PROTECTED]
>> >Sent: Friday, December 30, 2005 02:15 PM
>> >To: 'MyFaces Discussion'
>> >Subject: Re: tobago examples
>> >
>> >Hello Dennis,
>> >
>> >can you test it again.
>> >I have fixed one error in the tree control.
>> >
>> >Best Regards
>> >
>> >Bernd Bohmann
>> >
>> >Dennis Byrne schrieb:
>> >> 1.) http://tobago.atanion.net/tobago-example-demo/
>> >> 2.) click on "Tree Control"
>> >> 3.) click on the second tab.
>> >> 4.) click on the first tab.
>> >> 5.) click on the second tab
>> >> 6.) 404 for http://tobago.atanion.net/tobago-example-
>> >> demo/faces/overview/treeControl.jsp
>> >>
>> >> ---- Original message ----
>> >>
>> >>>Date: Tue, 20 Dec 2005 00:50:59 -0900
>> >>>From: Dennis Byrne <[EMAIL PROTECTED]>
>> >>>Subject: tobago examples
>> >>>To: [email protected]
>> >>>
>> >>>http://tobago.atanion.net/tobago-example-demo/
>> >>>
>> >>>I believe I have accidently brought down the demo app for
>> >>>tobago.  This is the second time I have clicked on one of
>> >>
>> >> the
>> >>
>> >>>tabs and received an error page, as well as a 404 whenever I
>> >>>go any page of the app.
>> >>>
>> >>>I cannot remember the name of the tab I clicked on.  If
>> >>>someone can tell me how to get a war file, it probably won't
>> >>>take long for me to retrace my steps.
>> >>>
>> >>>Dennis Byrne
>> >>
>> >>
>> >> Dennis Byrne
>> >>
>> >
>> >--
>> >Dipl.-Ing. Bernd Bohmann - Atanion GmbH - Software Development
>> >Bismarckstr. 13, 26122 Oldenburg, http://www.atanion.com
>> >phone: +49 441 4082312, mobile: +49 173 8839471, fax: +49 441 4082333
>> >
>>
>>
>>
>
>
>--
>Matthias Wessendorf
>Zülpicher Wall 12, 239
>50674 Köln
>http://www.wessendorf.net
>mwessendorf-at-gmail-dot-com
>


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