The reliable, generic, fast and flexible logging framework for Java.
Annotation-triggered method call logging for your debug builds.
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.
An extensible Java library for HTTP request and response logging
Graylog Extended Log Format (GELF) implementation in Java for all major logging frameworks: log4j, log4j2, java.util.logging, logback, JBossAS7 and WildFly 8-12
Best-of-breed OpenTracing utilities, instrumentations and extensions
Structured logging for Java on top of SLF4J API