java-tutorials/logging-modules/log-mdc

Relevant Articles:

• Improved Java Logging with Mapped Diagnostic Context (MDC)
• Java Logging with Nested Diagnostic Context (NDC)

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