Hi, apparently logback-classic 1.4.9 removed the public method `configureByResource` from `ContextInitializer`, thereby breaking backwards compatibility? The method was removed in a commit [1] which made it into 1.4.9. It was deprecated in November of last year: I don't think this deprecation has ever been in a major release? Even if it had, I'd say it's poor form to remove deprecated things in a patch release. This breaks Play Framework [3] which uses the method for its logging setup, making it impossible to upgrade to this patch version. Regards, Felix [1]: https://github.com/qos-ch/logback/commit/4b06e062488e4cb87f22be6ae96e4d7d635... [2]: https://github.com/qos-ch/logback/commit/86f388965204df28843039f65b0bc437aff... [3]: https://www.playframework.com/