3:06 p.m.
Gary Struthers [http://community.jboss.org/people/GaryS] created the discussion
"Can a POJO be Parameter Mapped?"
To view the discussion, visit: http://community.jboss.org/message/618409#618409
--------------------------------------------------------------
All the examples I've seen map basic types. I mapped a POJO to a Service Task
following the example of examples.junit
testServiceTask() (which maps a string). When I debug the Service Task the operation
method is called but the POJO parameter is null.
Can a POJO be parameter and result mapped? Is there an example showing how?
I did this in the XML editor of the BPMN file because the Process Editor doesn't save
my changes.
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7:14 a.m.
New subject: [jBPM] - Re: Can a POJO be Parameter Mapped?
Demian Calcaprina [http://community.jboss.org/people/calca] created the discussion
"Re: Can a POJO be Parameter Mapped?"
To view the discussion, visit: http://community.jboss.org/message/618583#618583
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Hi Gary,
Yes, it is possible. I think this example can help you:
https://github.com/Salaboy/Drools_jBPM5-Training-Examples/blob/master/jbp...
https://github.com/Salaboy/Drools_jBPM5-Training-Examples/blob/master/jbp...
You can check that the process
https://github.com/Salaboy/Drools_jBPM5-Training-Examples/blob/master/jbp...
https://github.com/Salaboy/Drools_jBPM5-Training-Examples/blob/master/jbp...
contains complex variables.
Basically, you have to:
1) Declare de variable type:
<itemDefinition id="_emergencyItem"
structureRef="com.wordpress.salaboy.example.model.Emergency"/>
2) Declare the variable:
<property id="emergency" itemSubjectRef="_emergencyItem"/>
3)
Declare the variable as input (or output) in the task:
<userTask id="_2" name="Ask for Emergency Information">
<ioSpecification>
*<dataInput id="_2_emergencyInput" name="emergency"/>*
....
....
<inputSet>
* <dataInputRefs>_2_emergencyInput</dataInputRefs>*
....
</inputSet>
<outputSet>
...
</outputSet>
</ioSpecification>
*<dataInputAssociation>*
* <sourceRef>emergency</sourceRef>*
* <targetRef>_2_emergencyInput</targetRef>*
* </dataInputAssociation>*
</userTask>
4) Send it as parameter in the process, or as an output of another task.
Hope it helps.
Demian
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3:09 p.m.
New subject: [jBPM] - Re: Can a POJO be Parameter Mapped?
Gary Struthers [http://community.jboss.org/people/GaryS] created the discussion
"Re: Can a POJO be Parameter Mapped?"
To view the discussion, visit: http://community.jboss.org/message/618900#618900
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Thanks Demian,
I'm still doing something wrong but I don't see it.
I followed the example carefully but I am still getting a null ServiceTask parameter.
Before I get to the ServiceTask I have a HumanTask with the same POJO as input and output
in my BPMN file. I'm using the example TestWorkItemHandler and not doing anything with
the POJO. Do I need to?
In the ServiceTask I'm using ServiceTaskHandler.
In jUnit...
@Test
public void evaluateScore() throws Exception {
// given
final StatefulKnowledgeSession kSession = createKnowledgeSession(fr.getKbase());
TestWorkItemHandler testWorkItemHandler = new TestWorkItemHandler();
kSession.getWorkItemManager().registerWorkItemHandler("Human
Task", testWorkItemHandler);
WorkItemManager wim = kSession.getWorkItemManager();
kSession.getWorkItemManager().registerWorkItemHandler("Service
Task", new ServiceTaskHandler());
...
Map<String, Object> params = new HashMap<String,
Object>();
params.put("vars", vars);
...
new Thread(new Runnable() {
public void run() {
kSession.fireUntilHalt(); // fireAllRules hangs
}
}).start();
ProcessInstance pi =
kSession.startProcess("x.x.x.workflow.xxx", params);
Thread.sleep(250);
// then
assertTrue(pi.getState() == ProcessInstance.STATE_ACTIVE);
restoreSession(kSession, true);
WorkItem workItem = testWorkItemHandler.getWorkItem();
assertNotNull(workItem);
assertEquals(workItem.PENDING, workItem.getState());
...
wim.completeWorkItem(workItem.getId(), null);
After completing the HumanTask workItem it executes the ServiceTask
public XX execute(XX vars) {
if(vars == null) { //@FIXME shouldn't be null
vars = new XX();
vars.setValidScore(true);
}
if(vars.isCanScore()) { //@TODO real implementation
vars.setValidScore(true);
}
return vars;
}
In BPMN
...
<itemDefinition id="_varsItem" structureRef="x.x.x.workflow.xxx"
/>
...
<itemDefinition id="_11_InMessageType"
structureRef=""x.x.x.workflow.xxx" />
<message id="_11_InMessage" itemRef="_11_InMessageType" />
<interface id="_11_ServiceInterface"
name=""x.x.x.workflow.xxx.EvaluateScore">
<operation id="_11_ServiceOperation" name="execute">
<inMessageRef>_11_InMessage</inMessageRef>
</operation>
</interface>
...
<!-- process variables -->
<property id="vars" itemSubjectRef="_varsItem"/>
...
<serviceTask id="_11" name="Evaluate Score"
operationRef="_11_ServiceOperation" implementation="Other" >
<ioSpecification>
<dataInput id="_11_varsInput" name="vars" />
<dataOutput id="_11_varsOutput" name="vars" />
<inputSet>
<dataInputRefs>_11_varsInput</dataInputRefs>
</inputSet>
<outputSet>
<dataOutputRefs>_11_varsOutput</dataOutputRefs>
</outputSet>
</ioSpecification>
<dataInputAssociation>
<sourceRef>vars</sourceRef>
<targetRef>_11_varsInput</targetRef>
</dataInputAssociation>
<dataOutputAssociation>
<sourceRef>_11_varsOutput</sourceRef>
<targetRef>vars</targetRef>
</dataOutputAssociation>
</serviceTask>
+
+
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5:21 p.m.
New subject: [jBPM] - Re: Can a POJO be Parameter Mapped?
Demian Calcaprina [http://community.jboss.org/people/calca] created the discussion
"Re: Can a POJO be Parameter Mapped?"
To view the discussion, visit: http://community.jboss.org/message/618912#618912
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Gary, if you use the default work item :
org.jbpm.bpmn2.handler.ServiceTaskHandler
I think the parameter has to be called "Parameter".
And then it is invoked:
...
* Object parameter = workItem.getParameter("Parameter");*
try {
Class<?> c = Class.forName(i);
Object instance = c.newInstance();
Class<?>[] classes = null;
Object[] params = null;
if (parameterType != null) {
classes = new Class<?>[] {
Class.forName(parameterType)
};
params = new Object[] {
parameter
};
}
Method method = c.getMethod(operation, classes);
* Object result = method.invoke(instance, params);*
Demian
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6:13 p.m.
New subject: [jBPM] - Re: Can a POJO be Parameter Mapped?
Gary Struthers [http://community.jboss.org/people/GaryS] created the discussion
"Re: Can a POJO be Parameter Mapped?"
To view the discussion, visit: http://community.jboss.org/message/618921#618921
--------------------------------------------------------------
Thanks again for your help, this is very frustrating.
I made this change
<serviceTask id="_11" name="Evaluate Score"
operationRef="_11_ServiceOperation" implementation="Other" >
<ioSpecification>
<dataInput id="_11_varsInput" name="Parameter" />
<dataOutput id="_11_varsOutput" name="Result" />
But the parameter is still null in my service task method. BPMN2-ServiceProcess and its
jUnit test testServiceTask() show no other references to "Parameter" so I
didn't change anything else.
Also ServiceTaskHandler doesn't provide a getter for workItem so I don't see how
to debug or call
public class ServiceTaskHandler implements WorkItemHandler {
public void executeWorkItem(WorkItem workItem, WorkItemManager manager)
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11:21 a.m.
New subject: [jBPM] - Re: Can a POJO be Parameter Mapped?
Demian Calcaprina [http://community.jboss.org/people/calca] created the discussion
"Re: Can a POJO be Parameter Mapped?"
To view the discussion, visit: http://community.jboss.org/message/619214#619214
--------------------------------------------------------------
Gary,
I just pulled an example:
https://github.com/calcacuervo/JBPM5-Samples/blob/master/bpmn-examples/sr...
https://github.com/calcacuervo/JBPM5-Samples/blob/master/bpmn-examples/sr...
That uses a service task with a POJO. It is the same than the example in jbpm, but with
custom intput/output.
You can check it and compare.
If you still have the problem, you can make a simple project with a test that fails with
your implementation and we can take a look.
Demian
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1:37 p.m.
New subject: [jBPM] - Re: Can a POJO be Parameter Mapped?
Gary Struthers [http://community.jboss.org/people/GaryS] created the discussion
"Re: Can a POJO be Parameter Mapped?"
To view the discussion, visit: http://community.jboss.org/message/619239#619239
--------------------------------------------------------------
Demian,
I was doing the same as your example except my itemDefinition had a structureRef, some
examples define it and some don't.
Then I copied my project and started removing tasks to make it simple. After I deleted the
Human Task preceding my Service Task the parameter was correctly passed to the service
method.
It looks like I have to propagate the POJO past the Human Task. What am I supposed to do?
I'm using a copy of Kris TestWorkItemHandler ( it's still in jUnit).
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8 p.m.
New subject: [jBPM] - Re: Can a POJO be Parameter Mapped?
Gary Struthers [http://community.jboss.org/people/GaryS] created the discussion
"Re: Can a POJO be Parameter Mapped?"
To view the discussion, visit: http://community.jboss.org/message/619290#619290
--------------------------------------------------------------
The reason the service task parameter worked after removing the Human Task is that the
TestWorkItemHandler(s) I copied from examples completed the task with null results. Once I
passed the pojo to workItemManager.completeWorkItem(...) my service task method then got
the pojo. This means you have to customize your testWorkItemHandlers to complete with the
result you expect.
class MyAutomaticHumanSimulatorWorkItemHandler implements WorkItemHandler {
private List<WorkItem> workItems = new ArrayList<WorkItem>();
public void executeWorkItem(WorkItem workItem, WorkItemManager workItemManager)
{
workItems.add(workItem);
System.out.println("Map of Parameters = " +
workItem.getParameters());
PIvars vars = (PIvars) workItem.getParameter("vars");
vars.setCanScore(true);
vars.setScore(new BigDecimal(4));
Map<String,Object>results = new HashMap();
results.put("vars", vars);
workItemManager.completeWorkItem(workItem.getId(), *results*);
System.out.println("Workitem completed " +
workItem.getName());
}
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