I pulled up a Groovy app from 2015. It generates a CSV file, from an Oracle query that's specified in an external file and fed to the app.
The imports are
It's currently at JDK 11, but I've already tried 7 and 8. I think the original was built with 7.
It uses groovy-3.0.9. When trying to build - not run the app - it halts the build with the exception
Where should I look first? Should I upgrade the Groovy version?