在Camunda条件下使用Spring Bean

Question

我有一个Camunda流程，如下所示：

我使用独家网关在我的工作流程中创建分支：当电子邮件已经确认时，我只是继续，如果不是，我想确认它。

为了实现这一点，我在序列流中添加了以下条件：

<!-- GATEWAY -->
<bpmn2:exclusiveGateway id="ExclusiveGateway_1" default="GO_TO_CONFIRM_EMAIL">
    <bpmn2:incoming>SequenceFlow_4</bpmn2:incoming>
    <bpmn2:outgoing>GO_TO_CONFIRM_EMAIL</bpmn2:outgoing>
    <bpmn2:outgoing>GO_TO_IDENTIFY_ORDER</bpmn2:outgoing>
</bpmn2:exclusiveGateway>

<!-- DEFAULT FLOW -->
<bpmn2:sequenceFlow id="GO_TO_CONFIRM_EMAIL" name="!confirmed" sourceRef="ExclusiveGateway_1" targetRef="CONFIRM_EMAIL"/>

<!-- FLOW WITH CONDITION -->
<bpmn2:sequenceFlow id="GO_TO_IDENTIFY_ORDER" name="confirmed" sourceRef="ExclusiveGateway_1" targetRef="IDENTIFY_ORDER">
    <bpmn2:conditionExpression xsi:type="bpmn2:tFormalExpression">${confirmEmailTaskAdapter.isConfirmed(CONFIRMED_ORDER_JSON)}</bpmn2:conditionExpression>
</bpmn2:sequenceFlow>

然而，当我运行它时，我得到以下异常：

org.camunda.bpm.engine.ProcessEngineException: Cannot construct activity-execution mapping: there are more scope executions missing than explained by the flow scope hierarchy.
    at org.camunda.bpm.engine.impl.pvm.runtime.LegacyBehavior.createActivityExecutionMapping(LegacyBehavior.java:294)
    at org.camunda.bpm.engine.impl.pvm.runtime.PvmExecutionImpl.createActivityExecutionMapping(PvmExecutionImpl.java:1211)
    at org.camunda.bpm.engine.impl.pvm.runtime.PvmExecutionImpl.createActivityExecutionMapping(PvmExecutionImpl.java:1144)
    at org.camunda.bpm.engine.impl.bpmn.behavior.AbstractBpmnActivityBehavior$ErrorDeclarationFinder.collect(AbstractBpmnActivityBehavior.java:248)
    at org.camunda.bpm.engine.impl.bpmn.behavior.AbstractBpmnActivityBehavior$ErrorDeclarationFinder.collect(AbstractBpmnActivityBehavior.java:223)
    at org.camunda.bpm.engine.impl.tree.TreeWalker.walkUntil(TreeWalker.java:72)
    at org.camunda.bpm.engine.impl.bpmn.behavior.AbstractBpmnActivityBehavior.propagateError(AbstractBpmnActivityBehavior.java:124)
    at org.camunda.bpm.engine.impl.bpmn.behavior.AbstractBpmnActivityBehavior.propagateExceptionAsError(AbstractBpmnActivityBehavior.java:94)
    at org.camunda.bpm.engine.impl.bpmn.behavior.ServiceTaskExpressionActivityBehavior.execute(ServiceTaskExpressionActivityBehavior.java:64)
    at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationActivityExecute.execute(PvmAtomicOperationActivityExecute.java:42)
    at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationActivityExecute.execute(PvmAtomicOperationActivityExecute.java:27)
    at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:134)
    at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:494)
    at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:484)
    at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:464)
    ... and some more ...

但是，如果我将条件更改为非常简单的条件，则该过程有效：

<!-- THIS WORKS FINE -->
<bpmn2:conditionExpression xsi:type="bpmn2:tFormalExpression">${true}</bpmn2:conditionExpression>

我的Spring Bean看起来很正常：

@Component
public class ConfirmEmailTaskAdapter {
    public boolean isConfirmed(String json) {
        // bla bla bla
        return true;
    }
}

为什么在Camunda条件下使用我的Spring Bean并不起作用？

Answer 1

由于它帮助托马斯，我会将上述评论作为答案发布，尽管这不是该问题的技术解决方案。

不是解决方案，而是可能有助于解决方案的最佳实践：我们不使用动态服务调用来进行网关决策，只使用预先评估的流程变量。因此，在您的情况下，为什么不使用Listener甚至serviceTask来确定已确认的值，将其写入流程变量，而不是仅在序列流上使用$ {isConfirmed} ...