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It seems I am facing the same issue: the groupId (e.g. "sales") of a human task is not assigned to the actual user belonging to that group (e.g. "sales-rep"). 

This prevents this user ("sales-rep") from actually being able to claim a "sales " group task when I log on as "sales-rep" in the jbpm-console

I found this bug https://issues.jboss.org/browse/JBPM-3401Is this the bug which is causing this? And does anybody know a workaround?

Thanks!

My BPMN2 proces is as follows:

<?xml version="1.0" encoding="UTF-8"?>

<model:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.omg.org/bpmn20" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:drools="http://www.jboss.org/drools" xmlns:model="http://www.omg.org/spec/BPMN/20100524/MODEL" id="_MvBWUdytEeGjZI5cVksRYQ" xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd" targetNamespace="http://www.omg.org/bpmn20">

  <model:itemDefinition id="_employeeItem" structureRef="String"/>

  <model:process id="Test.TestBPMN" drools:packageName="Test" drools:version="2" name="TestBPMN" isExecutable="true">

    <model:property id="employee" itemSubjectRef="_employeeItem"/>

    <model:laneSet id="_MvB9YNytEeGjZI5cVksRYQ">

      <model:lane id="_8C1EC1A3-BC43-4483-9E2B-7567D05BBC66" drools:bgcolor="#ffffff" drools:selectable="true" name="sales">

        <model:flowNodeRef>_C6A55EF5-7C66-4B7B-B8DE-68191620D936</model:flowNodeRef>

        <model:flowNodeRef>_7285E55F-3FC5-45DC-9628-C3203659F3A9</model:flowNodeRef>

        <model:flowNodeRef>_B3338629-A70B-4695-B041-F984A7377452</model:flowNodeRef>

      </model:lane>

    </model:laneSet>

    <model:sequenceFlow id="_580EAA85-D258-4B3A-A172-44F797ED5B48" drools:selectable="true" sourceRef="_7285E55F-3FC5-45DC-9628-C3203659F3A9" targetRef="_C6A55EF5-7C66-4B7B-B8DE-68191620D936"/>

    <model:sequenceFlow id="_700C3CB3-A3E4-4A97-A6FF-B62771E33F65" drools:selectable="true" sourceRef="_C6A55EF5-7C66-4B7B-B8DE-68191620D936" targetRef="_B3338629-A70B-4695-B041-F984A7377452"/>

   <model:userTask id="_C6A55EF5-7C66-4B7B-B8DE-68191620D936" drools:selectable="true" drools:taskName="whatever" drools:scriptFormat="http://www.java.com/java" name="TaskNr1">

      <model:incoming>_580EAA85-D258-4B3A-A172-44F797ED5B48</model:incoming>

      <model:outgoing>_700C3CB3-A3E4-4A97-A6FF-B62771E33F65</model:outgoing>

           <model:ioSpecification id="_MvB9YdytEeGjZI5cVksRYQ">

        <model:dataInput id="_C6A55EF5-7C66-4B7B-B8DE-68191620D936_TaskNameInput" name="TaskName"/>

        <model:dataInput id="_C6A55EF5-7C66-4B7B-B8DE-68191620D936_sales=GroupIdInput" name="sales=GroupId"/>

        <model:dataInput id="_C6A55EF5-7C66-4B7B-B8DE-68191620D936_TaskName=whateverInput" name="TaskName=whatever"/>

        <model:dataInput id="_C6A55EF5-7C66-4B7B-B8DE-68191620D936_GroupIdInput" name="GroupId"/>

        <model:inputSet id="_MvB9YtytEeGjZI5cVksRYQ">

          <model:dataInputRefs>_C6A55EF5-7C66-4B7B-B8DE-68191620D936_sales=GroupIdInput</model:dataInputRefs>

          <model:dataInputRefs>_C6A55EF5-7C66-4B7B-B8DE-68191620D936_TaskName=whateverInput</model:dataInputRefs>

          <model:dataInputRefs>_C6A55EF5-7C66-4B7B-B8DE-68191620D936_GroupIdInput</model:dataInputRefs>

          <model:dataInputRefs>_C6A55EF5-7C66-4B7B-B8DE-68191620D936_TaskNameInput</model:dataInputRefs>

        </model:inputSet>

        <model:outputSet id="_MvB9Y9ytEeGjZI5cVksRYQ"/>

      </model:ioSpecification>

          <model:dataInputAssociation id="_MvB9ZNytEeGjZI5cVksRYQ">

        <model:targetRef>_C6A55EF5-7C66-4B7B-B8DE-68191620D936_TaskNameInput</model:targetRef>

        <model:assignment id="_MvB9ZdytEeGjZI5cVksRYQ">

          <model:from xsi:type="model:tFormalExpression" id="_MvB9ZtytEeGjZI5cVksRYQ">whatever</model:from>

          <model:to xsi:type="model:tFormalExpression" id="_MvB9Z9ytEeGjZI5cVksRYQ">_C6A55EF5-7C66-4B7B-B8DE-68191620D936_TaskNameInput</model:to>

        </model:assignment>

      </model:dataInputAssociation>

           <model:dataInputAssociation id="_MvB9aNytEeGjZI5cVksRYQ">

        <model:targetRef>_C6A55EF5-7C66-4B7B-B8DE-68191620D936_GroupIdInput</model:targetRef>

        <model:assignment id="_MvB9adytEeGjZI5cVksRYQ">

          <model:from xsi:type="model:tFormalExpression" id="_MvB9atytEeGjZI5cVksRYQ">sales</model:from>

          <model:to xsi:type="model:tFormalExpression" id="_MvB9a9ytEeGjZI5cVksRYQ">_C6A55EF5-7C66-4B7B-B8DE-68191620D936_GroupIdInput</model:to>

        </model:assignment>

      </model:dataInputAssociation>

    </model:userTask>

  [...]

</model:definitions>