Try-Catch: Active Scope End node in inactive branch not allowed

[mwiegand]

Hi,

I’d like to bring this up again as the Try-Catch simply refuses to work properly. Adding all from the now closed ticket as FYI to upvote so this (hopefully) finally gets addressed.

[BUG] Active Scope End node in inactive branch not allowed.

I have a workflow with several nodes which can potentially fail. The part of the workflow with potential failures is surrounded by try-catch nodes. Within the try-catch scope, I have another sub scope, for example a chunk loop. A simplified example looks like this: [image] Problem: When the exeuction in the yellow Java Snippet node fails, the "Catch Errors" node cannot be executed and I get the following error: Active Scope End node in inactive branch not allowed. Any workarounds? Unfortun…

Best
Mike

[mwiegand]

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[mwiegand]

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[thor_landstrom]

Hey @mwiegand,

Just took a look at the attached thread you linked. Are you able to share the workflow that causes the problem?

I believe AP-5069 is the ticket you are referring to. One of the devs mention a workaround —> “just putting the loops into a component and the try-catch-scope around the component”

I can try to reproduce the bug and I will go ahead and add a +1 to the ticket for visibility.

TL

[mlauber71]

@thor_landstrom

I believe AP-5069 is the ticket you are referring to. One of the devs mention a workaround —> “just putting the loops into a component and the try-catch-scope around the component”

This seems to have been around for some time then …

Understanding Problem Error Handling Loop

@robbsen OK I think I built something you might be able to work with. The important points are: encapsulate your loop in a component. Otherwise KNIME seems to have a problem to identify the Try-Catch block provide an empty table with the same structure as the one you want to collect at the end of a loop. I think you also could just use one table with one column and allow changing data structures in your Loop-End (you might have to clean that up later) I have not fully worked out the use of the…

[mwiegand]

@thor_landstrom I believe an old version I privately shared with @DanielBog. Albeit outdated the issue is the same. There might even be a breakpoint present you could enable.

[thor_landstrom]

I went ahead and added a +1 to the ticket for more visibility.

TL