Log4j2 why would you use it over log4j? [closed]

Answer 1

Check this. In short, from the link:

Log4j 2.0 introduces:

• a new plugin system

• support for properties

• support for JSON-based configuration and automatic reloading of its configuration.

Support for many existing logging frameworks, including SLF4J, Commons Logging, Apache Flume and Log4j 1.x, and provides a new programmer’s API.

As you said it's also much faster.

Disadvantages are:

• log4j 2.0 is very different than log4j 1.x, and the API is mostly incompatible.

• Difficult to set up.

If you don't need any of the new features, you're probably fine with the older Log4j 1.x.