Which Is Better Log4J2 or Logback?

1. As logback is improved, version log4j and versions log4j2 and logback have no difference in terms of performance or any features. Therefore log4j is the most used logging utility before the logback newer versions were invented.

Which is better SLF4J or Log4j2?

As mentioned in the question, using the Log4j2 API directly offers more functionality and has some non-functional advantages versus using a wrapper API like slf4j: Message API. Lambdas for lazy logging. Log any Object instead of just Strings.

What is the difference between Log4j and Logback?

The main difference is that SLF4J is using static binding while commons. logging is using some resolution strategy. Logback (the "native" (i.e. there is no additional wrapper layer) implementation of the facade) is comparable to LOG4J but has a richer API.