These are the logging levels available in DataCleaner and Log4j, order by priority (highest priority first):
Typically the bottom-two logging levels (debug and trace) are not used unless unexpected situations has to be investigated by developers.
Modifying the logging levels can be done either globally or in a hierarchical manner:
If you change the <priority> element's value attribute, you change the global threshold for logging messages.
If you change the <logger> element's level, you change the logging priority logging messages that pertain to a particular hierarchy of loggers.