[Building Sakai] Full JSP CRUD tool

[Mustansar Mehmood]

Null pointer exceptions can be tricky figure out with error inspection
you may have to set a break point in

OtrotodoLogicImpl.java

before line 98 and step through this  and check that what value are 
available
here is the guide for setting up tomcat for remote debugging
http://bugs.sakaiproject.org/confluence/display/BOOT/Debugging+Tomcat+Remotely+Using+Eclipse
--mustansar
menjuanpablo wrote:
> hi,
> 		
> The problem is when I try to access to tool which is already deployed on a
> project in Sakai
>
> I'm work with sakai 2.5.0 and it generate following error 
>
>
> Exception:
> null
>
> java.lang.NullPointerException
> 	at
> org.sakaiproject.otrotodo.logic.OtrotodoLogicImpl.getAllVisibleItems(:98)
> 	at
> org.sakaiproject.otrotodo.tool.OtrotodoItemsBean.getAllVisibleItems(OtrotodoItemsBean.java:74)
> 	at org.apache.jsp.StartPage_jsp._jspService(StartPage_jsp.java:144)
> 	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
> 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
> 	at
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
> 	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
> 	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
> 	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.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:403)
> 	at
> org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
> 	at
> uk.ac.cam.caret.sakai.WebappToolServlet.service(WebappToolServlet.java:57)
> 	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$MyActiveTool.forward(ActiveToolComponent.java:459)
> 	at
> org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1343)
> 	at
> org.sakaiproject.portal.charon.handlers.ToolHandler.doTool(ToolHandler.java:163)
> 	at
> org.sakaiproject.portal.charon.handlers.ToolHandler.doGet(ToolHandler.java:86)
> 	at
> org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:891)
> 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
> 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
> 	at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
> 	at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
> 	at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:592)
> 	at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
> 	at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
> 	at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
> 	at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
> 	at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
> 	at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
> 	at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
> 	at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
> 	at
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
> 	at
> org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
> 	at
> org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
> 	at
> org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
> 	at
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
> 	at java.lang.Thread.run(Thread.java:595)
>
>