[krzyk]

commons, is something that is eventually being migrated into the main, at least those that are decided to be required for most projects. I don't use apache commons or guava at all in java (now at 25 or 26, depending on project) - there are still some libs that depend on those, but I would argue that most use it out of inertia, than actual need.

As for slf4j, I still don't see any justification for an abstraction layer on top of logging. I never, ever migrated from one logger to another, and even if I did need to do it - it is very easy as most loggers are very similar. E.g. that's why I decided to use log4j2 in my latest project.

[brabel]

The logging implementation should be an application level decision. By using a facade like slf4j a library allows an application using any logging implementation to use it. That’s why libraries should use it.

[krzyk]

Oh, yeah - libraries yes. But for application code it is useless.