This is the central interface in the log4j package.
Markers are objects that are used to add easily filterable information to log messages.
The ThreadContext Stack interface.
Logs "Events" that are represented as
Levels used for identifying the severity of an event.
The anchor point for the logging system.
Applications create Markers by using the Marker Manager.
Consider this class private, it is only public to satisfy Jackson for XML and JSON IO.
The ThreadContext allows applications to store information either in a Map or a Stack.
Exception thrown when an error occurs while logging.
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