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Answer» Following are features of log4j −
- It is thread-safe.
- It is optimized for speed.
- It is BASED on a named logger hierarchy.
- It supports multiple output appenders PER logger.
- It supports INTERNATIONALIZATION.
- It is not restricted to a predefined set of facilities.
- Logging behavior can be set at runtime using a configuration file.
- It is designed to handle Java Exceptions from the start.
- It uses multiple levels, namely ALL, TRACE, DEBUG, INFO, WARN, ERROR and FATAL.
- The format of the log output can be easily changed by extending the Layout class.
- The target of the log output as WELL as the WRITING strategy can be altered by implementations of the Appender interface.
- It is fail-stop. However, although it certainly strives to ensure delivery, log4j does not guarantee that each log statement will be delivered to its destination.
Following are features of log4j −
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