Log4jME, or log4j MicroEdition is based on nearly 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.

The features of log4jME are

• Same client interface

  The org.apache.log4j.Category shipped with log4jME has the same interface except support for ResourceBundles, custom category factories and object renderers.

• Smaller org.apache.log4j.FileAppender

  Log4jME contains a modified org.apache.log4jFileAppender which supports logging to files and output streams including Systemout and System.err.

• Smaller org.apache.log4j.PatternLayout

  Log4jME contains a modified org.apache.log4j.PatternLayout which supports the a limited set of conversion characters namely, %p, %t, %r, %c, %m, %n as well as literals. In particular, the %d ans %x conversion characters are not supported.

• Smaller org.apache.log4j.PropertyConfigurator

  Log4jME contains a modified org.apache.log4j.PropertyConfigurator which supports the same configuration syntax as the PropertyConfigurator in the standard edition except support for category factories and renderers.

The micro edition does nor offer the same number of appenders and layouts as in the standard edition. The DOMConfigurator is also not supported.