在camunda modeler中检查序列流上的变量是否为null

Question

On a sequenceFlow, I want to check a condition which may include a variable that may not be defined yet in process instance. so if it's not defined, I dont want to get ActivitiException of "the variable is not defined", but want the flow to proceed.

I wrote my condition like this:

${ A == null || Aa >= Bb }

then when A is null (not defined yet) I cant proceed :/

what should I do?

Answer 1

这是一种解决方法，但是您可以使用ExecutionListener并在进程启动时初始化该值，因此永远不会有Null值