The log4j team has created a successor to log4j with version number 2.0. log4j 2.0 was developed with a focus on the problems of log4j 1.2, 1.3, java.util.logging and logback, and addresses issues which appeared in those frameworks.
* Logback* Apache Commons* Slf4J* Blackbird* log4net* logging.apache.org* commons.apache.org* log4cpp порт библиотеки log4j на C++* log4j.ru — библиотека логирования сообщений log4* Введение в Log4J* Ceki Gülcü.