[Building Sakai] Full JSP CRUD tool

[Aaron Zeckoski]

You might just copy and paste the lines of code so we can see what
that line has on it (include maybe 5 or so lines from before it). It
might be something fairly simple.
-AZ


On Fri, May 8, 2009 at 7:36 PM, Mustansar Mehmood <mustansar at rice.edu> wrote:
> 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)
>>
>>
>
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-- 
Aaron Zeckoski (aaronz at vt.edu)
Senior Research Engineer - CARET - Cambridge University
[http://bugs.sakaiproject.org/confluence/display/~aaronz/]
Sakai Fellow - [http://aaronz-sakai.blogspot.com/]