Implementation of commons-logging Log interface that delegates all logging calls to the Avalon logging abstraction: the Logger interface. 

Implementation of the org.apache.commons.logging.Log interface that wraps the standard JDK logging mechanisms that are available in SourceForge's Lumberjack for JDKs prior to 1.4.

Implementation of the org.apache.commons.logging.Log interface that wraps the standard JDK logging mechanisms that were introduced in the Merlin release (JDK 1.4).

Implementation of Log that maps directly to a Log4J Category. 

Concrete subclass of LogFactory specific to log4j. 

Concrete subclass of LogFactory that implements the following algorithm to dynamically select a logging implementation class to instantiate a wrapper for.

• Use a factory configuration attribute named org.apache.commons.logging.Log to identify the requested implementation class.
• Use the org.apache.commons.logging.Log system property to identify the requested implementation class.
• If Log4J is available, return an instance of org.apache.commons.logging.impl.Log4JLogger.
• If JDK 1.4 or later is available, return an instance of org.apache.commons.logging.impl.Jdk14Logger.
• Otherwise, return an instance of org.apache.commons.logging.impl.SimpleLog.

If the selected Log implementation class has a setLogFactory() method that accepts a LogFactory parameter, this method will be called on each newly created instance to identify the associated factory. 

Implementation of org.apache.commons.logging.Log that wraps the avalon-logkit logging system. 

Trivial implementation of Log that throws away all messages. 

Concrete subclass of LogFactory which always delegates to the org.slf4j.LoggerFactory class. 

Simple implementation of Log that sends all enabled log messages, for all defined loggers, to System.err. 

Implementation of Hashtable that uses WeakReference's to hold its keys thus allowing them to be reclaimed by the garbage collector.