Using custom type in a form field in a user task leads to an unknown type error when executing

BPMN & Modeling Discussion & Questions
1

this is my definition of the user task:

<bpmn:userTask id="Task_4" name="Task 4" camunda:assignee="demo">
  <bpmn:extensionElements>
    <camunda:formData>
      <camunda:formField id="module" label="Modulkurse" type="ch.zhaw.iwi.demokell.Module" />
    </camunda:formData>
  </bpmn:extensionElements>
  <bpmn:incoming>SequenceFlow_1djhjhi</bpmn:incoming>
  <bpmn:outgoing>SequenceFlow_1dy1hbs</bpmn:outgoing>
</bpmn:userTask>

Executing the model in Eclipse will yield the following error (Module.java is available):

  • unknown type ‘ch.zhaw.iwi.demokell.Module’ | process.bpmn | line 77 | column 98
2

Hi Thomas Keller,

Camunda extends BPMN with custom Extension Elements and Attributes and one of the camunda extension elements is formField https://docs.camunda.org/manual/7.4/reference/bpmn20/custom-extensions/extension-elements/#formfield

Based on documentation https://docs.camunda.org/manual/7.4/user-guide/task-forms/#form-fields

Only the following types are supported for type attribute (out of the box):

  • string
  • long
  • date
  • boolean
  • enum

To work with serialized java objects in embedded forms see below sample
https://github.com/camunda/camunda-bpm-examples/tree/master/usertask/task-form-embedded-serialized-java-object