Hi,

Upon checking some behaviours in NiFi with Tamas Palfy, we have found that function signatures like this can be a frequent source of error:

|public FlowFile penalize(FlowFile flowFile) { ... }|

I documented the issue here:

https://cloudera.atlassian.net/wiki/spaces/ENG/pages/610534373/Discarding+Return+Values+in+NiFi

It would be nice if a Java dev with some spare time could look more into the issue and share their findings.

Cheers,
Adam

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