Apache Log4j 2 is an upgrade to Log4j that provides significant improvements over its predecessor, Log4j 1.x, and provides many of the improvements available in Logback while fixing some inherent problems in Logback's architecture.
The reliable, generic, fast and flexible logging framework for Java.
An extensible Java library for HTTP request and response logging
Annotation-triggered method call logging for your debug builds.
Graylog Extended Log Format (GELF) implementation in Java for all major logging frameworks: log4j, log4j2, java.util.logging, logback, JBossAS7 and WildFly 8-12
A sub microsecond java logger, supporting standard logging APIs such as Slf & Log4J
OWASP Security Logging library for Java