Only .xml test resources copied to target - not .json

I have 2 files in my resource/ dir: test.xml and test.json. When I hit "Make" it compiles everything correctly - but only copies the test.xml file. I did a bunch of renaming experiments and found out that it also ignores .txt and .js etc. Only .xml is copied.

Now I have to say that it's far from a regular Intellij project: I used the sbt-idea plugin to generate it. So something must went wrong - I just don't know what.

Is there ANY place to configure what resource file type is copied and what ignored?


Cheers