### Relevant Articles: - TBD - [Improved Java Logging with Mapped Diagnostic Context (MDC)](http://www.baeldung.com/mdc-in-log4j-2-logback) - [Java Logging with Nested Diagnostic Context (NDC)](http://www.baeldung.com/java-logging-ndc-log4j) - [Drools Using Rules from Excel Files](http://www.baeldung.com/drools-excel) ### References _Log4j MDC_ * <https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/MDC.html> * <http://veerasundar.com/blog/2009/10/log4j-mdc-mapped-diagnostic-context-what-and-why/> _Log4j2 MDC_ * <https://logging.apache.org/log4j/2.x/manual/thread-context.html> _Logback MDC_ * <http://logback.qos.ch/manual/mdc.html>