question ExecuteGroovyScript gives InstantiationException in Support Questions

ExecuteGroovyScript gives InstantiationException

peter_coppens — Fri, 20 Dec 2019 06:51:41 GMT

Hello

I am trying to add an ExecuteGroovyScript processor. A simple example test works fine, but when I try to add my script it does not initiate. Exception (on hoover over) is really brief: InstantiationException thrown by groovy invokehelper.

Script uses some external jars. As far as I can see I added those to the classpath.

I am probably doing something stupid but I was wondering how to debug this issue? The log files do not seem to contain anything wrt this error which makes troubleshooting very difficult

All tips warmly welcomed!

Peter

Re: ExecuteGroovyScript gives InstantiationException

DennisJaheruddi — Tue, 24 Dec 2019 11:31:15 GMT

This is quite a broad question and hard to troubleshoot all at once.

A general approach:

1. Analyze your custom code and identify all bits of complexity/all dependencies

2. Run the standard example

3. Introduce in a very minimal fashion one complexity/dependency from your custom code into the standard

4. If it works, repeat step 3

This should allow you to narrow down exactly what is causing the problem (and hopefully guide the resolution).

Re: ExecuteGroovyScript gives InstantiationException

peter_coppens — Tue, 24 Dec 2019 11:43:52 GMT

Hello,

Tx for your reaction Dennis. I was able to continue.

The reason I was having issues seemed to be related to the fact that the Groovy script was a standard class with a static main method. It makes sense that Nifi does not accept that I guess, but the process of diagnosing such issue might be made easier imo. It was a trial and error task, and as you suggested, by starting from an example.

Anyway, I am good now 🙂

Regards

Peter