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.blogwow.tool.producers.HomeProducer.fillComponents(HomeProducer.java:54)
	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.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:287)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:165)
	at $Proxy66.fillComponents(Unknown Source)
	at uk.org.ponder.rsf.view.support.ViewGenerator.generateView(ViewGenerator.java:53)
	at uk.org.ponder.rsf.processor.RSFRenderHandler$1.run(RSFRenderHandler.java:92)
	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:615)
	at uk.org.ponder.rsf.flow.support.BasicScopedAlterationWrapper$$EnhancerByCGLIB$$52e2382e.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:615)
	at uk.org.ponder.rsf.flow.support.BasicScopedAlterationWrapper$$EnhancerByCGLIB$$52e2382e.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.RSFRenderHandler.handle(RSFRenderHandler.java:85)
	at uk.org.ponder.rsf.processor.RSFRenderHandler$$FastClassByCGLIB$$8252dcfe.invoke(<generated>)
	at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
	at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:615)
	at uk.org.ponder.rsf.processor.RSFRenderHandler$$EnhancerByCGLIB$$d7fd8c22.handle(<generated>)
	at uk.org.ponder.rsf.processor.RenderHandlerBracketer.handle(RenderHandlerBracketer.java:84)
	at uk.org.ponder.rsf.processor.RenderHandlerBracketer$$FastClassByCGLIB$$2fdfc810.invoke(<generated>)
	at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
	at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:615)
	at uk.org.ponder.rsf.processor.RenderHandlerBracketer$$EnhancerByCGLIB$$d018e7d8.handle(<generated>)
	at uk.org.ponder.rsf.servlet.RootHandlerBean.handleGet(RootHandlerBean.java:121)
	at uk.org.ponder.rsf.servlet.RootHandlerBean.handle(RootHandlerBean.java:101)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	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.RSACBeanLocatorImpl.createBean(RSACBeanLocatorImpl.java:550)
	at uk.org.ponder.rsac.RSACBeanLocatorImpl.access$000(RSACBeanLocatorImpl.java:72)
	at uk.org.ponder.rsac.RSACBeanLocatorImpl$1.run(RSACBeanLocatorImpl.java:446)
	at uk.org.ponder.rsac.RSACErrorBridge.invokeRunnable(RSACErrorBridge.java:38)
	at uk.org.ponder.rsac.RSACBeanLocatorImpl.createBean(RSACBeanLocatorImpl.java:444)
	at uk.org.ponder.rsac.RSACBeanLocatorImpl.getLocalBean(RSACBeanLocatorImpl.java:345)
	at uk.org.ponder.rsac.RSACBeanLocatorImpl.getBean(RSACBeanLocatorImpl.java:376)
	at uk.org.ponder.rsac.PerRequestInfo$1.locateBean(PerRequestInfo.java:49)
	at uk.ac.cam.caret.sakai.rsf.servlet.ReasonableSakaiServlet.service(ReasonableSakaiServlet.java:64)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:555)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:691)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:469)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:364)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
	at org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward(ActiveToolComponent.java:441)
	at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1099)
	at org.sakaiproject.portal.charon.handlers.ToolHandler.doTool(ToolHandler.java:163)
	at org.sakaiproject.portal.charon.handlers.ToolHandler.doGet(ToolHandler.java:86)
	at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:717)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:592)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:200)
	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:773)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:895)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
	at java.lang.Thread.run(Thread.java:595)