Oracle BPM Java API - getting informations about process activities

Hi
I have a problem with Oracle BPM Java API, can someone help me?
I have a business process project deployed in Oracle SOA Suite and I need to get some informations of my process programatically via Java API.
Basically I need to get informations about process activities and the corresponding human tasks referenced by these activities.
I'm able to get the HumanTasks of my Business Catalog and also to get the Activities of my Process, but the relationship between them is null.
I did some tests, below a piece of code of my test:
IBPMServiceClient bpmServiceClient = BPMConnectionUtil.getBPMServiceClient();
IProcessMetadataService processMetadataService = bpmServiceClient.getProcessMetadataService();
IProcessModelService processModelService = bpmServiceClient.getProcessModelService();
List<ProcessMetadataSummary> processMetadataSummaryList =
processMetadataService.listProcessMetadataSummary(BPMConnectionUtil.getBPMContext(), "processNameOrId to find", "processName", "ASC");
if (processMetadataSummaryList == null || processMetadataSummaryList.size() == 0)
return;
ProcessMetadataSummary processMetadataSummary = null;
for (ProcessMetadataSummary summary: processMetadataSummaryList) {
if (summary.isIsDefaultRevision()) {
processMetadataSummary = summary;
break;
if (processMetadataSummary == null)
processMetadataSummary = processMetadataSummaryList.get(0);
IProcessModelPackage pack = processModelService.getProcessModel(BPMConnectionUtil.getBPMContext(), processMetadataSummary.getCompositeDN(), processMetadataSummary.getProcessName());
oracle.bpm.project.model.processes.Process process = pack.getProcessModel();
Sequence<UserTask> activities = process.getActivities(UserTask.class);
for (UserTask activity: activities) {
System.out.println("Human Task: " +activity.getHumanTask()); // <<<<<<<<<<<<<<<<<<<<---------------------------- here is the problem. the human task is null, but my activity have a task associated
There is another way to get this information?
Thank's

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