A factory for loggers that redirect all Java logging events to the Apache's
Log4J framework.
since: 2.4 version: $Id: Log4JLoggerFactory.java 27891 2007-11-14 14:10:48Z desruisseaux $ author: Martin Desruisseaux
getImplementation(String name) Returns the implementation to use for the logger of the specified name,
or
null if the logger would delegates to Java logging anyway.