How to pass Parameter to JSP in USerTask

Hi,
I have a process with UserTask(Worklist). How do I pass a parameter to my custom JSP Page. On UserTask Wizard I selected JSP URL option to display the payload
and that is a custom JSP page that reads data from multiple tables based on the parameter passed.
I have created a Workflow process and I am calling a Custom JSP page to show the data. But from my process I just want to pass in a variable as a parameter to
the JSP Page that then displays the data based on the parameter value, but I can't figure out on how to pass the parameter. Any help is appreciated.
Thanks

I redeployed the application and made the parent applicaion as orabpel, but now I am getting the following error. Any help is appreciated. Thanks
<2006-07-06 13:54:36,857> <ERROR> <default.collaxa.cube> <BaseCubeSessionBean::logError> Error while invoking bean "task manager": Instance not found in datasource.
The process domain was unable to fetch the instance with key "" from the datasource.
Please check that the instance key "" refers to a valid instance that has been started and not removed from the process domain.
ORABPEL-02152
Instance not found in datasource.
The process domain was unable to fetch the instance with key "" from the datasource.
Please check that the instance key "" refers to a valid instance that has been started and not removed from the process domain.
     at com.collaxa.cube.engine.data.AdminFinder.__lookupInstanceMetaData(AdminFinder.java:314)
     at com.collaxa.cube.engine.data.AdminFinder.__lookupInstanceMetaData(AdminFinder.java:262)
     at com.collaxa.cube.engine.data.AdminFinder.lookupInstanceByConversationId(AdminFinder.java:235)
     at com.collaxa.cube.ejb.impl.TaskManagerBean.lookupTask(TaskManagerBean.java:57)
     at ITaskManagerBean_StatelessSessionBeanWrapper66.lookupTask(ITaskManagerBean_StatelessSessionBeanWrapper66.java:81)
     at com.oracle.services.bpel.task.WorklistService.lookupTask(WorklistService.java:93)
     at _index._jspService(_index.java:68)
     at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
     at oracle.jsp.runtimev2.JspPageTable.compileAndServe(JspPageTable.java:569)
     at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:305)
     at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509)
     at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:824)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:830)
     at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:224)
     at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:133)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
     at java.lang.Thread.run(Thread.java:534)
06/07/06 13:54:36 ORABPEL-02152
Instance not found in datasource.
The process domain was unable to fetch the instance with key "" from the datasource.
Please check that the instance key "" refers to a valid instance that has been started and not removed from the process domain.
06/07/06 13:54:36      at com.collaxa.cube.engine.data.AdminFinder.__lookupInstanceMetaData(AdminFinder.java:314)
06/07/06 13:54:36      at com.collaxa.cube.engine.data.AdminFinder.__lookupInstanceMetaData(AdminFinder.java:262)
06/07/06 13:54:36      at com.collaxa.cube.engine.data.AdminFinder.lookupInstanceByConversationId(AdminFinder.java:235)
06/07/06 13:54:36      at com.collaxa.cube.ejb.impl.TaskManagerBean.lookupTask(TaskManagerBean.java:57)
06/07/06 13:54:36      at ITaskManagerBean_StatelessSessionBeanWrapper66.lookupTask(ITaskManagerBean_StatelessSessionBeanWrapper66.java:81)
06/07/06 13:54:36      at com.oracle.services.bpel.task.WorklistService.lookupTask(WorklistService.java:93)
06/07/06 13:54:36      at _index._jspService(_index.java:68)
06/07/06 13:54:36      at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
06/07/06 13:54:36      at oracle.jsp.runtimev2.JspPageTable.compileAndServe(JspPageTable.java:569)
06/07/06 13:54:36      at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:305)
06/07/06 13:54:36      at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509)
06/07/06 13:54:36      at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413)
06/07/06 13:54:36      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
06/07/06 13:54:36      at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:824)
06/07/06 13:54:36      at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330)
06/07/06 13:54:36      at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:830)
06/07/06 13:54:36      at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:224)
06/07/06 13:54:36      at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:133)
06/07/06 13:54:36      at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
06/07/06 13:54:36      at java.lang.Thread.run(Thread.java:534)

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