Log4j2: filters

Filters are used to filter the log events. Filters take the decision, whether to log the event (or) not.

You can configure filters in one of four locations.

a.   Context-wide filters: You can configure filters at configuration level. Events that are rejected by these filters will not be passed to loggers for further processing.

b.   Logger filters: These filters are configured at logger level. Events that are rejected by these filters will be discarded and the event will not be passed to a parent Logger regardless of the additivity setting.

c.    Appender filters: filters attached to appender and take decision whether this appender accept (or) reject the log event.
d.   Appender Reference Filters: Determine if a Logger should route the event to an appender.

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