CursorBlock Exception while traversing a value cursor

Question

     The version of Oracle :9.2.0.1
     I am using ORACLE Connection Pooling for obtaining the connection
      Oracle Connection Pooling
          // Create OracleConnectionPoolDataSource instance
          ocpds = new OracleConnectionPoolDataSource();
ocpds.setDriverType("oracle.jdbc.driver.OracleDriver");
//Constants.JDBC_DRIVER_TYPE);
//ocpdsOlap.setURL("jdbc:oracle:thin:@host:1521:test");
ocpds.setURL("jdbc:oracle:thin:@host:1521:test");
//ocpds.setURL("jdbc:oracle:thin:@host:1521:test");
ocpds.setUser("scott");
ocpds.setPassword("tiger");
//Use Oracle Connection Cache implementation
ocacheimpl = new OracleConnectionCacheImpl(ocpds);
//Set the maximum number of connections
ocacheimpl.setMinLimit(5);
ocacheimpl.setMaxLimit(40);
//set the scheme
ocacheimpl.setCacheScheme(OracleConnectionCacheImpl.DYNAMIC_SCHEME);
          // Getting the Connection          
          mObjConnection = ocacheimpl.getConnection();     
     After obtaining a connection the meta data is generated (ie Data Provider and Tansaction Provider)
     After this the data based on the user parameters is fetched and a report is shown.
     This request is succesful the first time round.
     For subsequent drill down on the report the same meta data objects are used
     The connection is not closed nor is the DataProvider Transaction Provider.
     For a few drill downs this works, but then the a null pointer exception is raised while traversing the output cursor part of compound cursor
     The fetch size is the default fetch size I have not changed that
     The code segment
// Getting the Row And Columns VAlue Cursors for the Primary Measure
ValueCursor colCursor = (ValueCursor) outputs.get(nOutputs - 1);
ValueCursor rowCursor = (ValueCursor) outputs.get(nOutputs - 2);
     do
RowValues.add(rowCursor.getCurrentValue());
} while (rowCursor.next());
     the stack trace
     java.lang.NullPointerException
     at oracle.express.olapi.data.CursorBlock.[init](CursorBlock.java:48)
     at oracle.express.olapi.data.full.FullCursorBlockFetcher.fetchCursorBlock(FullCursorBlockFetcher.java:58)
     at oracle.express.olapi.data.PrimaryCursorBlockProvider.getCursorBlock(PrimaryCursorBlockProvider.java:71)
     at oracle.express.olapi.data.SecondaryCursorBlockProvider.getCursorBlock(SecondaryCursorBlockProvider.java:80)
     at oracle.express.olapi.data.CursorTreeManager.revalidate(CursorTreeManager.java:215)
     at oracle.express.olapi.data.ExpressValueCursor.getCurrentValue(ExpressValueCursor.java:158)
     at com.pg.emfg.eops.helperclasses.Olap.getData(D:/Source Code/src/com/pg/emfg/eops/helperclasses/OldOLAP/Olap.java:1035)
     at com.pg.emfg.eops.helperclasses.Olap.execute(D:/Source Code/src/com/pg/emfg/eops/helperclasses/OldOLAP/Olap.java:931)
     at com.pg.emfg.eops.component.dynamicviewreport.eventaction.DynamicViewReportEventAction.perform(D:/Source Code/src/com/pg/emfg/eops/component/dynamicviewreport/eventaction/DynamicViewReportEventAction.java:350)
     at com.pg.emfg.eops.waf.controller.statehandler.StateMachine.processEvent(D:/Source Code/src/com/pg/emfg/eops/waf/controller/statehandler/StateMachine.java:114)
     at com.pg.emfg.eops.waf.controller.web.DefaultWebController.handleEvent(D:/Source Code/src/com/pg/emfg/eops/waf/controller/web/DefaultWebController.java:92)
     at com.pg.emfg.eops.waf.controller.web.RequestProcessor.processRequest(D:/Source Code/src/com/pg/emfg/eops/waf/controller/web/RequestProcessor.java:166)
     at com.pg.emfg.eops.waf.controller.web.MainServlet.doProcess(D:/Source Code/src/com/pg/emfg/eops/waf/controller/web/MainServlet.java:214)
     at com.pg.emfg.eops.waf.controller.web.MainServlet.doPost(D:/Source Code/src/com/pg/emfg/eops/waf/controller/web/MainServlet.java:135)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at allaire.jrun.servlet.JRunSE.service(../servlet/JRunSE.java:1416)
     at allaire.jrun.session.JRunSessionService.service(../session/JRunSessionService.java:1082)
     at allaire.jrun.servlet.JRunSE.runServlet(../servlet/JRunSE.java:1270)
     at allaire.jrun.servlet.JRunRequestDispatcher.forward(../servlet/JRunRequestDispatcher.java:89)
     at allaire.jrun.servlet.JRunSE.service(../servlet/JRunSE.java:1552)
     at allaire.jrun.servlet.JRunSE.service(../servlet/JRunSE.java:1542)
     at allaire.jrun.servlet.JvmContext.dispatch(../servlet/JvmContext.java:364)
     at allaire.jrun.jrpp.ProxyEndpoint.run(../jrpp/ProxyEndpoint.java:388)
     at allaire.jrun.ThreadPool.run(../ThreadPool.java:272)
     at allaire.jrun.WorkerThread.run(../WorkerThread.java:75)
This exception crashes the entire ORACLE service
Please provide any inputs on this exception and the possible solution.

Answer 1

Suspect that this is a problem on the server, perhaps when fetching additional blocks. A SQL trace file would be helpful. Please feel free to send the compressed file to [email protected] Thanks