How to configure logging in nexmark test

[Teodor Spæren]

Hey!

My question is about how to turn on DEBUG and TRACE logging when running 
the nexmark test suite via:

./gradlew :sdks:java:testing:nexmark:run

I've found the file 
sdks/java/testing/nexmark/src/main/resources/log4j.properties, but 
modifiying it seems to have no affect on the output.

I'm not that well versed in java, any help is appriciated :)

Teodor