Bootstrap listener for custom log4j initialization in a web environment.
(see its javadoc for configuration details).
WARNING: Assumes an expanded WAR file
, both for loading the configuration
file and for writing the log files. If you want to keep your WAR unexpanded or
don't need application-specific log files within the WAR directory, don't use
log4j setup within the application (thus, don't use Log4jConfigListener or
Log4jConfigServlet). Instead, use a global, VM-wide log4j setup (for example,
in JBoss) or JDK 1.4's
(which is global too).
This listener should be registered before ContextLoaderListener in
when using custom log4j initialization.