Hi,

I am developing reports to be displayed using the Java Reportig Component. They display OK but when I try to drill down via the Group Tree I get the following exception:

2004-12-13 09:30:55,475 [http-8280-Processor22] ERROR com.crystaldecisions.reports.reportengineinterface : Exception occured while processing findGroup request
java.lang.NullPointerException
at com.crystaldecisions.reports.reportengineinterface .Engine.navigateToGroup(Unknown Source)
at com.crystaldecisions.reports.reportengineinterface .JPEReportSource.findGroup(Unknown Source)
at com.crystaldecisions.report.web.viewer.ReportAgent .a(Unknown Source)
at com.crystaldecisions.report.web.viewer.CrystalRepo rtViewer.long(Unknown Source)
at com.crystaldecisions.report.web.viewer.CrystalRepo rtViewer.a(Unknown Source)
at com.crystaldecisions.report.web.ServerControl.a(Un known Source)
at com.crystaldecisions.report.web.ServerControl.proc essHttpRequest(Unknown Source)
at com.symbio.sona.admin.servlets.CrystalReports.doPo st(CrystalReports.java:628)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:810)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invo keInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
at org.apache.catalina.valves.AccessLogValve.invoke(A ccessLogValve.java:535)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:117)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(Co yoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:793)
at org.apache.coyote.http11.Http11Protocol$Http11Conn ectionHandler.processConnection(Http11Protocol.jav a:702)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(P oolTcpEndpoint.java:571)
at org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:644)
at java.lang.Thread.run(Thread.java:534)


Any ideas?