Loggers properties include several different component activities that can be recorded by the server.log. The Logger properties specify the user-designated level of logging for an event.
Each logger can be set to record information at any of the following levels:
FINEST: messages provide highly detailed tracing
FINER: messages provide more detailed tracing
FINE: messages provide basic tracing
CONFIG: provides static configuration messages
INFO: provides informative messages
WARNING: messages indicate a warning
SEVERE: messages indicate a severe failure
OFF: no logging messages