Starting from version 1.4.8 of Logback, an issue has been observed where MDC properties are no longer associated with log statements when a custom MDCAdapter, for instance com.twitter.inject.logging.FinagleMDCAdapter, is set in the application.

The likely root cause is that, beginning with version 1.4.8, Logback obtains the MDCAdapter from {{ch.qos.logback.classic.LoggerContext}} instead of directly getting it from MDC. Consequently, the application ends up using two separate and independent MDCAdapters concurrently.

You can find a simplified application created to reproduce this issue in the following repository: https://github.com/naser-ayat/logback-bug-reproducer