Well, it is actually an intermediate message throw event as well as a message throw end event, my xml is at the bottom.
I had a look at the examples and for the intermediate throw event, a send task handler was defined:
KnowledgeBase kbase = createKnowledgeBase("BPMN2-IntermediateThrowEventMessage.bpmn2");
StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
ksession.getWorkItemManager().registerWorkItemHandler("Send Task", new SendTaskHandler());
I then looked at the xml for the send task example as well as the intermediate message throw example, neither has any attribute like tns:name="Send Task" and oryx is also not producing one ?
Intermediate message throw event:
<intermediateThrowEvent id="_2" name="MessageEvent" >
<dataInput id="_2_Input" />
<dataInputAssociation>
<sourceRef>x</sourceRef>
<targetRef>_2_Input</targetRef>
</dataInputAssociation>
<inputSet>
<dataInputRefs>_2_Input</dataInputRefs>
</inputSet>
<messageEventDefinition messageRef="_2_Message"/>
</intermediateThrowEvent>
<endEvent id="_3" name="EndEvent" />
//send task
<sendTask id="_2" name="Hello" messageRef="_2_Message" implementation="Other" >
<ioSpecification>
<dataInput id="_2_param" name="Message" />
<inputSet>
<dataInputRefs>_2_param</dataInputRefs>
</inputSet>
<outputSet/>
</ioSpecification>
<dataInputAssociation>
<sourceRef>s</sourceRef>
<targetRef>_2_param</targetRef>
</dataInputAssociation>
</sendTask>
My process xml:
<bpmn2:intermediateThrowEvent id="_1246A3A8-08AE-4FEC-AEDB-731A233E28CE" name="Update Twitter Status (throw message)">
<bpmn2:incoming>_BC5261CD-860C-4979-A045-AE209C41780D</bpmn2:incoming>
<bpmn2:outgoing>_3E572AF9-62AA-4D13-B0E7-BD1A3B893C80</bpmn2:outgoing>
<bpmn2:dataInput id="_1246A3A8-08AE-4FEC-AEDB-731A233E28CE_Parameter" name="Parameter"/>
<bpmn2:dataInputAssociation id="_amcjQ-J1EeC2tu7nt8W9eg">
<bpmn2:sourceRef>x</bpmn2:sourceRef>
<bpmn2:targetRef>_1246A3A8-08AE-4FEC-AEDB-731A233E28CE_Parameter</bpmn2:targetRef>
</bpmn2:dataInputAssociation>
<bpmn2:inputSet id="_amcjQuJ1EeC2tu7nt8W9eg">
<bpmn2:dataInputRefs>_1246A3A8-08AE-4FEC-AEDB-731A233E28CE_Parameter</bpmn2:dataInputRefs>
</bpmn2:inputSet>
<bpmn2:messageEventDefinition id="_amcjROJ1EeC2tu7nt8W9eg" drools:msgref="twitterProductLink" messageRef="twitterProductLink"/>
</bpmn2:intermediateThrowEvent>