Java / log4j
Explain different logging levels in log4j.
The DEBUG level designates fine-grained informational events useful to debug an application.
The INFO level designates informational messages that highlight the progress of the application at coarse-grained level.
The WARN level designates potentially harmful situations.
The ERROR level designates error events that might still allow the application to continue running.
The TRACE Level designates finer-grained informational events than the DEBUG.
FATAL level designates very severe error events that will presumably lead the application to abort.
The ALL Level has the lowest possible rank and is intended to turn on all logging.
The OFF Level has the highest possible rank and is intended to turn off logging.
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