It would be nice of slf4j used a high service ranking when it registered LogService so it will take precedent over any built-in LogService provided by the OSGi runtime (e.g. Equinox). I figured if deploying the slf4j LogService most people would expect this implementation to be used, but that Equinox's built-in service is registered as well at the default service level so bundles importing LogService might get that one instead of the slf4j implementation.

See https://github.com/qos-ch/slf4j/pull/174