The project history gives a brief summary of changes and additions. Users frequently report bugs that are solved in newer versions of log4j. Please have a look at the history file before asking for help.

The project's official URL is http://jakarta.apache.org/log4j.

Many thanks to all the log4j users who keep sending us input and sometimes even praise for our collective effort.

The first ancestor of log4j was written for the E.U. sponsored SEMPER project. N. Asokan, Ceki Gülcü and Michael Steiner came up with the idea of hierarchical categories back in 1996. Their idea is still at the heart of log4j.

The package was considerably improved over the years by Ceki Gülcü while working at the IBM Zurich Research Laboratory. However, log4j is no longer associated nor supported with IBM. Please do not refer to log4j as IBM's logging package.

Special thanks to M. Niksch from ZRL for his assistance on many large and small matters. The Apache members, Pier Fumagalli and Sam Ruby in particular, have been extremely helpful in easing the move to Apache.

The log4j logo was designed and kindly donated by of Switzerland.