[Building Sakai] Lesson Builder null pointer exception when deleting

Diego del Blanco Orobitg diego.delblanco.sakai at gmail.com
Mon Sep 23 08:45:09 PDT 2013 

Sorry mail sent without the end of the mail:

Only miss say Thanks ;)


2013/9/23 Diego del Blanco Orobitg <diego.delblanco.sakai at gmail.com>

> Hi all:
>
> I've this fail in Leson Builder when deleting the last subpage in a
> Page... only sometimes :( but a lot of sometimes :), Anyway I've not been
> able to find a reason for this "sometimes" not sure when it happens and
> when it doesn't happen.
>
> I have sakai 2.9.1 (I've in mind migrate to 2.9.3 soon) and as I've
> touched some code (not the code where it fails, I'd like to know if someone
> has this error too and if there is a patch (I've not found anything in
> Jira... )
>
> As said, to reproduce it, if you have a page with some subpages , all of
> them as next page and as buttom, when you delete the last one (entering in
> the previous one, editing the button with the lik to the next one, and
> deleting) sometimes I have this exception.
>
>
> Fatal internal error handling request:
> Target exception of class java.lang.NullPointerException
> Successive lines until stack trace show causes progressing to exception
> site:
>
> java.lang.NullPointerException
> at
> org.sakaiproject.lessonbuildertool.tool.beans.SimplePageBean.addPrevLink(SimplePageBean.java:1357)
> at
> org.sakaiproject.lessonbuildertool.tool.producers.ShowPageProducer.fillComponents(ShowPageProducer.java:827)
>  at
> uk.org.ponder.rsf.view.support.ViewCollector.fillComponents(ViewCollector.java:56)
> at
> uk.org.ponder.rsf.view.support.LayoutCollector.fillComponents(LayoutCollector.java:68)
>  at sun.reflect.GeneratedMethodAccessor2760.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>  at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
>  at
> org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:198)
> at com.sun.proxy.$Proxy99.fillComponents(Unknown Source)
>  at
> uk.org.ponder.rsf.view.support.ViewGenerator.generateView(ViewGenerator.java:53)
> at
> uk.org.ponder.rsf.processor.support.RSFRenderHandler$1.run(RSFRenderHandler.java:79)
>  at
> uk.org.ponder.rsf.processor.support.RequestInvoker$1.run(RequestInvoker.java:46)
> at
> uk.org.ponder.util.CollectingRunnableInvoker$1.run(CollectingRunnableInvoker.java:25)
>  at
> uk.org.ponder.rsf.flow.support.BasicScopedAlterationWrapper.invokeRunnable(BasicScopedAlterationWrapper.java:59)
> at
> uk.org.ponder.rsf.flow.support.BasicScopedAlterationWrapper$$FastClassByCGLIB$$84f89202.invoke(<generated>)
>  at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
> at
> org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:628)
>  at
> uk.org.ponder.rsf.flow.support.BasicScopedAlterationWrapper$$EnhancerByCGLIB$$715b903c.invokeRunnable(<generated>)
> at
> uk.org.ponder.rsf.flow.support.BasicScopedAlterationWrapper$$FastClassByCGLIB$$84f89202.invoke(<generated>)
>  at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
> at
> org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:628)
>  at
> uk.org.ponder.rsf.flow.support.BasicScopedAlterationWrapper$$EnhancerByCGLIB$$715b903c.invokeRunnable(<generated>)
> at
> uk.org.ponder.util.CollectingRunnableInvoker$1.run(CollectingRunnableInvoker.java:29)
>  at
> uk.org.ponder.util.CollectingRunnableInvoker.invokeWrappers(CollectingRunnableInvoker.java:22)
> at
> uk.org.ponder.util.CollectingRunnableInvoker.invokeRunnable(CollectingRunnableInvoker.java:14)
>  at
> uk.org.ponder.rsf.processor.support.RequestInvoker.invokeRunnable(RequestInvoker.java:39)
> at
> uk.org.ponder.rsf.processor.support.RSFRenderHandler.handle(RSFRenderHandler.java:75)
>  at
> uk.org.ponder.rsf.processor.support.RSFRenderHandler$$FastClassByCGLIB$$5bda3a3d.invoke(<generated>)
> at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
>  at
> org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:628)
> at
> uk.org.ponder.rsf.processor.support.RSFRenderHandler$$EnhancerByCGLIB$$5de8c3b7.handle(<generated>)
>  at
> uk.org.ponder.rsf.processor.support.RenderHandlerBracketer.handle(RenderHandlerBracketer.java:82)
> at
> uk.org.ponder.rsf.processor.support.RenderHandlerBracketer$$FastClassByCGLIB$$3055fa0f.invoke(<generated>)
>  at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
> at
> org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:628)
>  at
> uk.org.ponder.rsf.processor.support.RenderHandlerBracketer$$EnhancerByCGLIB$$2b7e4b09.handle(<generated>)
> at
> uk.org.ponder.rsf.processor.support.RootHandlerBeanBase.handleGet(RootHandlerBeanBase.java:97)
>  at
> uk.org.ponder.rsf.processor.support.RootHandlerBeanBase.handle(RootHandlerBeanBase.java:79)
> at sun.reflect.GeneratedMethodAccessor2587.invoke(Unknown Source)
>  at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
>  at
> uk.org.ponder.reflect.JDKReflectiveCache.invokeMethod(JDKReflectiveCache.java:23)
> at
> uk.org.ponder.reflect.JDKReflectiveCache.invokeMethod(JDKReflectiveCache.java:17)
>  at
> uk.org.ponder.reflect.JDKReflectiveCache.invokeMethod(JDKReflectiveCache.java:77)
> at
> uk.org.ponder.rsac.support.RSACBeanLocatorImpl.createBean(RSACBeanLocatorImpl.java:553)
>  at
> uk.org.ponder.rsac.support.RSACBeanLocatorImpl.access$000(RSACBeanLocatorImpl.java:75)
> at
> uk.org.ponder.rsac.support.RSACBeanLocatorImpl$1.run(RSACBeanLocatorImpl.java:449)
>  at
> uk.org.ponder.rsac.RSACErrorBridge.invokeRunnable(RSACErrorBridge.java:38)
> at
> uk.org.ponder.rsac.support.RSACBeanLocatorImpl.createBean(RSACBeanLocatorImpl.java:447)
>  at
> uk.org.ponder.rsac.support.RSACBeanLocatorImpl.getLocalBean(RSACBeanLocatorImpl.java:348)
> at
> uk.org.ponder.rsac.support.RSACBeanLocatorImpl.getBean(RSACBeanLocatorImpl.java:379)
>  at
> uk.org.ponder.rsac.support.PerRequestInfo$1.locateBean(PerRequestInfo.java:49)
> at
> uk.ac.cam.caret.sakai.rsf.servlet.ReasonableSakaiServlet.service(ReasonableSakaiServlet.java:65)
>  at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
>  at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
> at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:634)
>  at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
>  at
> org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
> at
> org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
>  at
> org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
> at
> org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
>  at
> org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward(ActiveToolComponent.java:508)
> at
> org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1615)
>  at
> org.sakaiproject.portal.charon.handlers.ToolHandler.doTool(ToolHandler.java:223)
> at
> org.sakaiproject.portal.charon.handlers.ToolHandler.doGet(ToolHandler.java:98)
>  at
> org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:903)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
>  at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
>  at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
> at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:695)
>  at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
>  at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
>  at
> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
>  at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
> at
> org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
>  at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
>  at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
> at
> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
>  at
> org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
>  at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
> at java.lang.Thread.run(Thread.java:662)
>
> --
> Diego del Blanco Orobitg
> Tutordemia IT & Training Manager
> Apereo LATAM Representative
>



-- 
Diego del Blanco Orobitg
Tutordemia IT & Training Manager
Apereo LATAM Representative
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