Where to find logger output?

Ok, I feel like I should have been able to figure this out myself. But I don’t know the LoggerFactory class, I see the logger variable being set in the Graphhopper class
private final Logger logger = LoggerFactory.getLogger(getClass());

but I cannot find where logger’s output destination is configured… Any hints appreciated.

Nevermind, I think it’s just std out…

With the log4j config you can define if it is std or a file etc