[jboss-user] [jBPM] - How can I get a itemDefinition related to a process variable?

Francesco Pietrobelli do-not-reply at jboss.com
Wed Aug 10 11:53:05 EDT 2011

Francesco Pietrobelli [http://community.jboss.org/people/francesco.pietrobelli] created the discussion

"How can I get a itemDefinition related to a process variable?"

To view the discussion, visit: http://community.jboss.org/message/620413#620413

Hi guys,
I would like to build forms for human activities in an automatic and dynamic fashion, but to do this I need to know the data type associated to every dataOutput of the tasks.

My first idea was to retrieve the data type of a process variable inside a WorkItemHandler in the following way:

public void executeWorkItem(WorkItem item, WorkItemManager manager) {
     WorkflowProcessInstance currentProcess = (WorkflowProcessInstance) ksession.getProcessInstance(item.getProcessInstanceId());
     HumanTaskNodeInstance currentNode = (HumanTaskNodeInstance) findNodeInstance(item.getId(), currentProcess);
     Map<String, String> outMappings = ht.getHumanTaskNode().getOutMappings();
     for (String outParameterName : outMappings.keySet()) {
          System.out.println("Type of process variable: "+currentProcess.getVariable(outMappings.get(outParameterName)).getClass());
private WorkItemNodeInstance findNodeInstance(long workItemId,NodeInstanceContainer container) {
     for (NodeInstance nodeInstance : container.getNodeInstances()) {
          if (nodeInstance instanceof WorkItemNodeInstance) {
               WorkItemNodeInstance workItemNodeInstance = (WorkItemNodeInstance) nodeInstance;
               if (workItemNodeInstance.getWorkItem().getId() == workItemId) {
                    return workItemNodeInstance;
          if (nodeInstance instanceof NodeInstanceContainer) {
               WorkItemNodeInstance result = findNodeInstance(workItemId,((NodeInstanceContainer) nodeInstance));
               if (result != null) {
                    return result;
     return null;

But in many case outMappings.get(outParameterName) returns null because process variable wasn't set before and so and i can't invoke getClass() on it.

Does any one have any suggestion? is possible to do this programmatically via API?


P.S: I'am using jBPM 5.1Final

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