Log4Jのバージョン

memo

現状
Apache log4j has three development branches: a stable branch, 1.2, a discontinued branch, 1.3 and an experimental branch 2.0.

log4j 1.3 development has been abandoned and no future releases or development is anticipated.Users of log4j 1.3 are encouraged to migrate to log4j 1.2 or to monitor and contribute to the log4j 2.0 development effort.

Apache log4j 2.0 is an experimental development branch for logging services designed for Java 5 and later.