How to write the log in the TWE task script running in CMDBuild?

Question

I'm using TWE (Together Workflow Editor) to write XPDL file with the java code. The file is imported into CMDBuild.

I follow the example of OpenMaint.

logger.debug("action {}", Action);

However, I couldn't find the debug log in the cmdbuild.log. It runs without error. How to let it export to the log file?

By the way, is there a way to debug the code in the script?