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🔶 Camunda 7 ​

Engine-specific behavior when using processEngine = CAMUNDA_7.

Service Task Detection ​

Service tasks are detected via one of these camunda: attributes:

  • camunda:delegateExpression — e.g. #{sendMailDelegate}
  • camunda:class — e.g. com.example.SendMailDelegate
  • camunda:topic — for external tasks, e.g. mail.send
xml
<bpmn:serviceTask id="Activity_SendMail" name="Send Mail"
    camunda:delegateExpression="#{sendMailDelegate}">
</bpmn:serviceTask>

The attribute value becomes the entry in the generated TaskTypes object.

Variable Extraction ​

I/O Mappings ​

Variables are extracted from camunda:inputOutput:

xml
<bpmn:extensionElements>
  <camunda:inputOutput>
    <camunda:inputParameter name="orderId">${orderId}</camunda:inputParameter>
    <camunda:outputParameter name="mailSent">true</camunda:outputParameter>
  </camunda:inputOutput>
</bpmn:extensionElements>

The name attribute of each parameter becomes a variable.

Message Start Events

camunda:inputOutput is not supported on message start events in Camunda 7. Use extension properties with additionalVariables instead (see below).

Additional Variables (Extension Properties) ​

For elements where I/O mappings aren't supported (like message start events), you can declare variables via camunda:properties:

xml
<bpmn:extensionElements>
  <camunda:properties>
    <camunda:property name="additionalVariables" value="orderId, customerEmail, amount" />
  </camunda:properties>
</bpmn:extensionElements>

The comma-separated list is parsed and each value becomes a variable. This works on any BPMN element.

Call Activity Mappings ​

Call activity variables come from camunda:in and camunda:out mappings, not from camunda:inputOutput:

xml
<bpmn:callActivity id="CallActivity_Process" calledElement="sub-process">
  <bpmn:extensionElements>
    <camunda:in source="orderId" target="orderId" />
    <camunda:out source="result" target="processResult" />
  </bpmn:extensionElements>
</bpmn:callActivity>

Variables are extracted from the source attribute of camunda:in and the target attribute of camunda:out.

Multi-Instance ​

Multi-instance variables come from attributes on the multiInstanceLoopCharacteristics element:

xml
<bpmn:multiInstanceLoopCharacteristics
    camunda:collection="${subscribers}"
    camunda:elementVariable="subscriber" />

Extracted variables: subscribers (from collection expression), subscriber (element variable)