Which log4j facade to choose?

Question

Essentially I'm looking for something with the same behavior, configuration, logging levels as log4j, but with some of the missing functionality (e.g. formatted logging — see here and here for related SO threads.)

Current nominees are slf4j and log5j.

Answer 1

I'm inclined toward SLF4J.

• allows parameterized logging (formatting)
• allows consolidation of other frameworks (great for apps using many libraries, each logging to a different framework)

log5j is good, but does not have near as much market penetration.

Answer 2

since a lot of frameworks already support slf4j you will only have to setup your logging once with slf4j.

i use slf4j and it is super-easy to read + use.