Java / log4j

Advantages of using log4j framework.

Thread safe.
Optimized for performance.
Supports more than one appender per logger.
Extensible.
Logging behavior is specified in a configuration file loaded during runtime.
Supports different logging levels such as WARN, INFO, and ERROR.
The logging format can be easily changed my altering the Layout class or by extending it.
The destination and the log writing strategy can be altered by implementing Appender interface.

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