Add a JUL to Log4j API conversion

[ppkarwasz]

What problem are you trying to solve?

Some users are migrating code from java.util.logging to Log4j API (cf. apache/logging-log4j2#2083), therefore it would be useful to have a recipe to convert JUL to Log4j API.

This issue can be split into two parts:

• the basic methods such as Logger#fine and Logger#getLogger can be rewritten declaratively,
• more advanced methods, such as Logger#log(Level, String, Object[]) that emulates parameterized logging will probably require some logic to be applied. In the cased of "alternative parameterized logging" a MessageFormatMessageFactory instance is required.

I can provide a short-term PR for the first part, while the second part requires more work (but is also only useful to a handful of users).

[timtebeek]

Probably best tackled in two separate PRs indeed. Do I understand correctly you aim to work on this as well?

For the second part of more advanced methods you're welcome to start a draft PR with just some tests, such that we can more clearly see what needs to be covered, and how to fill in the blanks on a dedicated recipe.

[ppkarwasz]

@timtebeek,

Yes, I will work on it. It is well within the scope of apache/logging-log4j2#2080 and we have users interested in it.

[timtebeek]

Great, thanks a lot! Let me know if you need any help; either here or on our public Slack