Hi Michael, You could check the java api documentation:
# e.g. java_se_N_docu/docs/api/java/lang/NullPointerException.html You could also check if the `click on the name of the title' reduces to an sql-query in the dspace-source and apply that query to see if you get the expected result. It's possible to navigate the source code by converting to diagrams and point and click with Netbeans. Only a minority of 4-lines of the trace refer to webui, perhaps the java+tomcat combination is awry. Best wishes, -- Van Ly -----Original Message----- From: Onte, Michael [mailto:mo...@lrri.org] Sent: Sun 2009-07-26 07:23 To: dspace-tech@lists.sourceforge.net Subject: [Dspace-tech] Internal System Error I upgraded our Dspace from 1.4.2 to 1.5 by following the steps on the manual. Everything seems to work fine after that except when we do a search and then click on the name of the title. I then get the message Internal System Error. Below is the java stack displayed when I viewed the source of the page. If anybody can help, it would be greatly appreciated. java.lang.NullPointerException at org.dspace.app.webui.servlet.HandleServlet.displayItem(HandleServlet.java:331) at org.dspace.app.webui.servlet.HandleServlet.doDSGet(HandleServlet.java:180) at org.dspace.app.webui.servlet.DSpaceServlet.processRequest(DSpaceServlet.java:151) at org.dspace.app.webui.servlet.DSpaceServlet.doGet(DSpaceServlet.java:99) 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.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) Michael Onte Database Administrator Lovelace Respiratory Research Institute mo...@lrri.org <mailto:mo...@lrri.org> Office - (505) 348-9460 Cell - (505) 975-4504
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