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