system property org.apache.commons.logging.log is also consulted). If the Log4J logging system is available in the application class path, use the corresponding wrapper class (Log4JLogger). If the application is executing on a JDK 1.4 system, use the corresponding wrapper class (Jdk14Logger). Fall back to the default simple logging wrapper (SimpleLog). Load the class of the specified name from the thread context class loader (if any), or from the class loader that loaded the LogFactory class otherwise....