.....
129.194.112.4 - mdl_admin [14/Apr/2010:15:29:24 +0100] "GET /lams//tool/lawiki10/learning.do?mode=learner&toolSessionID=1491 HTTP/1.1" 500 4496
.......

2010-04-14 15:29:24,842 WARN  [org.apache.struts.action.RequestProcessor] Unhandled Exception thrown: class java.lang.NullPointerException
2010-04-14 15:29:24,855 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/lams/tool/lawiki10].[action]] Servlet.service() for servlet action threw exception
java.lang.NullPointerException
	at org.lamsfoundation.lams.tool.wiki.dto.WikiPageContentDTO.<init>(WikiPageContentDTO.java:19)
	at org.lamsfoundation.lams.tool.wiki.dto.WikiPageDTO.<init>(WikiPageDTO.java:20)
	at org.lamsfoundation.lams.tool.wiki.web.actions.LearningAction.unspecified(LearningAction.java:192)
	at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:249)
	at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.lamsfoundation.lams.web.filter.LocaleFilter.doFilterInternal(LocaleFilter.java:142)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.lamsfoundation.lams.web.session.SystemSessionFilter.doFilter(SystemSessionFilter.java:71)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.lamsfoundation.lams.integration.security.SingleSignOn.invoke(SingleSignOn.java:121)
	at org.lamsfoundation.lams.integration.security.LoginRequestValve.invoke(LoginRequestValve.java:67)
	at org.apache.catalina.valves.FastCommonAccessLogValve.invoke(FastCommonAccessLogValve.java:481)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
	at java.lang.Thread.run(Thread.java:619)