http://logging.apache.org/log4j/2.x/manual/configuration.html
Inserting log requests into the application code requires a fair amount of planning and effort. Observation shows that approximately 4 percent of code is dedicated to logging. Consequently, even moderately sized applications will have thousands of logging statements embedded within their code. Given their number, it becomes imperative to manage these log statements without the need to modify them manually.
Configuration of Log4j 2 can be accomplished in 1 of 4 ways:
INTRO
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