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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