[rules-users] WorkItem and Parameter

[Geoff Cadien]

I'm new to Drools (5.0.1) and attempted to create a simple workflow
example using a WorkItem and can't seem to figure out how to have
parameters passed to the WorkItem.  I must be missing something
obvious (not understanding variable scopes maybe?) but just can't see
it.  Below is the code I'm using:

<?xml version="1.0" encoding="UTF-8"?>
<process xmlns="http://drools.org/drools-5.0/process"
         xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
         xs:schemaLocation="http://drools.org/drools-5.0/process
drools-processes-5.0.xsd"
         type="RuleFlow" name="ruleflow" id="com.sample.ruleflow"
package-name="com.sample" >

  <header>
  </header>

  <nodes>
    <start id="1" name="Start" x="16" y="16" >
    </start>
    <workItem id="2" name="Test" x="435" y="97" width="80" height="40" >
      <work name="Test" >
      </work>
      <mapping type="in" from="p1" to="p1" />
    </workItem>
    <end id="3" name="End" x="240" y="16" />
  </nodes>

  <connections>
    <connection from="1" to="2" />
    <connection from="2" to="3" />
  </connections>

</process>

public class Test {

    public static void main( String[] args ) {
        KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add(
ResourceFactory.newClassPathResource("process.rf"), ResourceType.DRF
);

        KnowledgeBuilderErrors errors = kbuilder.getErrors();
        if (errors.size() > 0) {
            for (KnowledgeBuilderError error: errors) {
                System.err.println(error);
            }
            throw new IllegalArgumentException("Could not parse knowledge.");
        }

        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        ksession.getWorkItemManager().registerWorkItemHandler("Test",
new TestWorkItemHandler());
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("p1", "param1");
        ksession.startProcess("com.sample.ruleflow", params);
    }
}

public class TestWorkItemHandler implements WorkItemHandler {
    public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {

        System.out.println(workItem.getParameters());
        manager.completeWorkItem(workItem.getId(), null);
    }

    public void abortWorkItem(WorkItem workItem, WorkItemManager manager) {

    }
}

and the output:

Could not find variable scope for variable p1
when trying to execute Work Item Test
Continuing without setting parameter.
{}

Thanks in advance,

-geoff