How can I check if a variable is set?

BPMN & Modeling Discussion & Questions
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hasVariable returns true for me in specific cases when getVariable returns null

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@Edmondo_Porcu can you provide more detail on the usage to get this result?

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“I would try ${not empty service_result_id}”

This is the one that works for me reliably.

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@StephenOTT I have reproduced a case where I have process A calling process BP: a simple CallActivity. The mapping is such that sometimes an optionally nullable variable of process A is mapped to process B, and when this occurs, the variable will be set to NULL in process B but it will exist in the variable store

Therefore, some expressions that are used in Gateways might fail to behave correctly

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Would you say this is a bug?

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I think it is, it is a bug in the input/output mapping.

If want to map a variable that is optional in process A, and it happens to be missing, I don’t want that execution.hasVariable(‘myVar’) in subProcess B returns true because the mapping has created a null variable in subProcess B

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