GitHub user hansva added a comment to the discussion: Apache Hop – How to get 
full stack trace from User Defined Java Class?

If it is reusable code and complex I would write a transform for it.

But it is possible some of the errors that are being returned by janino are 
being eaten by our own code and it might be worth it to look into it.

You can start hop-gui with the debug argument and then attach a debugger or IDE 
to the running instance to see what is happening in the UDJC transform

GitHub link: 
https://github.com/apache/hop/discussions/5526#discussioncomment-13776710

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