Problem in using Oracle BPEL 10.1.2 (beta3) Worklist API

Question

I'm trying the following simple program but fails. Thanks advance for your help. Here are the codes:
package test;
import oracle.tip.pc.api.worklist.IWorklistContext;
import oracle.tip.pc.infra.exception.PCException;
import oracle.tip.pc.services.hw.worklist.WorklistService;
public class TaskTester
public static void main(String[] args)
String username="jcooper";
String password="welcome";
try
WorklistService worklistService = WorklistService.getWorklistService();
IWorklistContext ctx = worklistService.authenticateUser(username,password);
System.out.println("Success");
catch (PCException pce)
pce.printStackTrace();
System.out.println(pce.toString());
The following error message is resulted:
log4j:WARN No appenders could be found for logger (collaxa.cube.services).
log4j:WARN Please initialize the log4j system properly.
Warning: Could not locate file pc.properties in classpath
java.lang.NullPointerException
at oracle.tip.pc.services.hw.worklist.WorklistService.authenticateUser(WorklistService.java:272)
at test.TaskTester.main(TaskTester.java:17)
ORABPEL-10142
Worklist Service Authenticate User Error.
An error occured in the Worklist Service while authenticating user jcooper with the identity service.
Check the error stack and fix the cause of the error. Contact oracle support if error is not fixable.

Answer 1

It works fine after I port it to a web service. But, there's another problem when I try to call "getWorklistTasks" after "authenticateUser" and the codes are as follows:
IWorklistContext ctx = worklistService.authenticateUser(userName,password);
Map filterMap = new HashMap();
filterMap.put("TaskFilter", "My & Group");
filterMap.put("PriorityFilter", "Any");
filterMap.put("StatusFilter", "Assigned");
filterMap.put("BusinessProcessFilter", "Any");
List taskList = worklistService.getWorklistTasks(ctx, "", filterMap, "Title", "ASC");
It resulted that after calling "getWorklistTasks", it hanged and no reply.
Any idea? Thanks a lot.
Best Regards,
Simon.