Log4j API is a generic logging facade for various logging frameworks. While Log4j Core implements it at its fullest, you can easily switch to other implementations such as Logback or …

Apache Log4j is a versatile, industrial-grade Java logging framework composed of an API, its implementation, and components to assist the deployment for various use cases.

The API for Log4j 2 is not compatible with Log4j 1.x, however an adapter is available to allow applications to continue to use the Log4j 1.x API. Adapters are also available for Apache …

Log4j is essentially composed of a logging API called Log4j API, and its reference implementation called Log4j Core. Log4j also bundles several logging bridges to enable Log4j Core consume …

You can manually download all published Log4j distributions, verify them, and see their licensing information by following the instructions in the Download page of Logging Services.

The table below contains links to the Javadoc API Documentation for the components you are most likely to use directly in code.

Even though Log4j Core is the reference implementation of Log4j API, Log4j API itself also provides a very minimalist implementation: Simple Logger. This is a convenience for …

Log4j Core uses plugins to inject necessary components while reading a configuration file. In this section, we will explore extension points users can hook into to customize the way Log4j Core …

The JUL-to-Log4j API and Log4j 1-to-Log4j API will no longer be able to modify the configuration of Log4j Core by default. If such a functionality is required, it must be explicitly enabled.

The API for Log4j 2 is not compatible with Log4j 1.x, however an adapter is available to allow applications to continue to use the Log4j 1.x API. Adapters are also available for Apache …