Metrics is a Java library which gives you unparalleled insight into what your code does in

An addition to Metrics which provides the ability to run application-specific health checks,

A set of classes which allow you to monitor critical aspects of your Java Virtual Machine

An instrumented appender for Log4j 1.x.

Apache Commons Logging is a thin adapter allowing configurable bridging to other,

Implementation for Apache Log4J, a highly configurable logging tool that focuses on performance and low garbage ...

Collection of standard XML processing interfaces including DOM, SAX, and JAXP, providing foundational APIs for XML ...

JUnit Jupiter is the API for writing tests using JUnit 5.