| Class Summary | 
| Jdk14Logger | Implementation of the org.apache.commons.logging.Loginterfaces that wraps the standard JDK logging mechanisms that were
 introduced in the Merlin release (JDK 1.4). | 
| Log4JCategoryLog | Implementation of Logthat maps directly to a Log4J
 Category. | 
| Log4jFactory | Concrete subclass of LogFactoryspecific to log4j. | 
| LogFactoryImpl | Concrete subclass of LogFactorythat implements the
 following algorithm to dynamically select a logging implementation
 class to instantiate a wrapper for. | 
| LogKitLogger | Implementation of org.apache.commons.logging.Logthat wraps the jakarta-avalon-logkit
 logging system. | 
| NoOpLog | Default implementation of Log that throws away all messages. | 
| SimpleLog | Simple implementation of Log that sends all enabled log messages,
 for all defined loggers, to System.err. |