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https://issues.apache.org/jira/browse/NIFI-15739?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Stieglitz updated NIFI-15739:
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Status: Patch Available (was: In Progress)
> ExecuteGroovyScript: FlowFile not transferred to failure when dynamic
> property contains Expression Language syntax error
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: NIFI-15739
> URL: https://issues.apache.org/jira/browse/NIFI-15739
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 2.5.0
> Reporter: Xinyu Wang
> Assignee: Daniel Stieglitz
> Priority: Major
> Attachments: image-2026-03-25-08-33-20-522.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When an ExecuteGroovyScript processor has a dynamic property whose value
> contains an Expression Language syntax error, and the Failure Strategy is set
> to "transfer to failure", the FlowFile in the upstream queue is not
> transferred to the failure relationship. Instead, the FlowFile remains stuck
> in the incoming queue, and the processor enters an infinite error loop —
> logging the same error on every scheduling trigger.
> *Root Cause*
> In ExecuteGroovyScript.onTrigger(), the execution order is:
> # Evaluate dynamic properties — iterates context.getProperties() and calls
> evaluateAttributeExpressions() on each dynamic property value
> # Execute script — where session.get() is typically called by user code to
> dequeue a FlowFile
> The GroovyProcessSessionWrap maintains a toFail list that is only populated
> when session.get() is called.
> When a dynamic property has an EL syntax error:
> * The exception is thrown at step 1
> * script.run() (step 2) is never reached
> * session.get() is never called
> * toFail list remains empty
> * The catch block calls session.revertReceivedTo(REL_FAILURE, t), which
> iterates over the empty toFail list — effectively a no-op
> * The FlowFile was never dequeued, so it stays in the incoming connection
> *Steps to Reproduce*
> # Create a flow: GenerateFlowFile → ExecuteGroovyScript
> # In ExecuteGroovyScript, set Failure Strategy to "Transfer to failure"
> # Add a dynamic property (e.g. myProp) with an invalid EL expression as
> value, e.g. *_${myparam:isempty()}_*
> # Add a simple script body
> # Connect the failure relationship to a downstream processor (e.g.
> LogAttribute)
> # Start the flow
> {*}Expected{*}: FlowFile is transferred to the failure relationship with
> ERROR_MESSAGE and ERROR_STACKTRACE attributes.
> {*}Actual{*}: FlowFile remains stuck in the incoming queue. The processor
> logs the expression language error repeatedly on every trigger. Nothing is
> ever routed to failure.
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