First, congrats on getting started with NiFi and not being afraid to tackle one of the harder processors: ExecuteScript. My advice is to start small, get a working script that maybe doesnt do what you want, but does actually complete and return SUCCESS in your NiFi flow. From there you can start building it up and testing step by step. I also recommend that you tail the NIFI Log during all of your work so that you can see any errors or information from each test/step. My last peice of advice for an advanced script would be to manually execute your script to ensure that its logic is working outside of the execution from within NiFi. You may find the following links very helpful: https://community.hortonworks.com/articles/75032/executescript-cookbook-part-1.html https://community.hortonworks.com/articles/75545/executescript-cookbook-part-2.html https://community.hortonworks.com/articles/75545/executescript-cookbook-part-3.html If my answer is helpful, please choose ACCEPT. ... View more