Garret Wilson Have you tried implementing SLF4JServiceProvider directly in clogr? You could replicate the logback 1.2.x behavior in your own SLF4JServiceProvider.

One difficulty I see is forcing the loading of the intended SLF4JServiceProvider by org.slf4j.LoggerFactory. You will have clogr's provider and logback's provider and SLF4J will pick the first one it finds on the list. Assume that problem is solved, and try implementing SLF4JServiceProvider in clog4r.