Download version 1.1.3 including full source code, class files and documentation in TAR.GZ format or in ZIP format. You may elect to browse log4j documentation online.

Version 1.1.3 is the 21st major public release of log4j. It is backward compatible with log4j version 1.0.x.

We also maintain a list of earlier versions of log4j for download, intended for the curious paleontologist.

An alpha version of log4j 1.2 is now available in in TAR.GZ format or in ZIP format.

Log4j version 1.2 is still in alpha stage. It is not feature-complete, still requries fair amount of testing, nor is the documentation up to date. We have gone to great lengths to ensure that version 1.2 is backward compatible with earlier versions. However, some previously deprecated APIs are now removed. Moreover, users who have written sub-classes of Category will need to modify their code. See the HISTORY file for more details.

log4jME

Log4jME, or log4j MicroEdition, is based on the same code as log4j. However, as the name indicates the micro-edition is much smaller. It offers the same client interface such that code compiled for log4jME is 100% compatible with log4j standard edition. You can choose to upgrade to log4j standard edition at any time by replacing log4jME.jar with log4j.jar in your classpath.

Lumbermill

Lumbermill is a Swing(tm) log processing and distribution system for Log4j.

JDBCAppender

A JDBCAppender by Thomas Fenner.

Chainsaw

Chainsaw is a GUI log viewer and filter for the Log4J package. It listens for LoggingEvent objects sent using the SocketAppender and displays them in a table.

LogFactor5

A GUI appender (commercial).

Log Tag

A custom log tag library from the Jakarta Taglibs project.

configLog4j

A visual log4j configuration file editor by Tobias Dezulian.

JINI logging service (registration required)

A log4j wrapper for JINI Jerome Bernard.

log4cpp

A library of C++ classes for flexible logging to files, syslog, IDSA and other destinations modeled after log4j by Bastiaan Bakker.

log4cplus

A competing port to C++.

log4py

Log4Py is a python logging module similar to log4j. It supports logging to files or to stdout/stderr, variable log-levels, configurable output formats and configuration via configuration files. For an example output see the screenshot below.

log4p

Another Python translation of log4j. This project no longer seems to be maintained.

log4c

ANSI C functions and macros for flexible logging to files and other destinations. It is modeled after the Log for Java library (http://www.log4j.org), staying as close to their API as is reasonable. Intended for use in time-space critical environments.

log4net

The .NET implementation of the popular log4j Java API providing flexible and arbitrarily granular control over log management and configuration.

log4r

A Powerful Logger for Ruby.

Log4r features an extremely flexible logging library for Ruby. Killer features include a heiarchial logging system of any number of levels, logger inheritance, multiple output destinations, tracing, custom formatting and more. Log4r was inspired by log4j. Log4r provides the defining features of log4j and some of its own features that just might make log4j users envious.

log4E

The Goanna project (Eiffel Web Services) now includes log4E, a complete port of log4j.

If you would like your software to be listed here, then send a note to the log4j-user@jakarta.apache.org list.