Robert Elliot wrote:

Thanks for the fast response!

> Gossip and log4J are both logging systems.

I found that it is a 'plugin for SLF4J', but I didn't know that it was a 
logging system in its own right.

> The big question is why your modules think they need to specify a logging 
> system; in the case of gmaven I would guess because you are using it embedded 
> but it can also run stand-alone.

GMaven is embedded in our build to generate Java stubs in a mixed Java/Groovy 
submodule. gmaven-runtime-1.7:1.3 brings in gmaven-runtime-support:1.3, which 
brings in gshell-io:2.0, which brings in gossip:1.0.

> In the case of the other module I would guess that it's a legacy one, and you 
> should be using log4j-over-slf4j to redirect log4j to it (unless you actually 
> want to use log4j).

The other module uses Magnolia CMS, which via a couple of links brings in both 
slf4j-log4j12 and jcl-over-slf4j according to mvn dependency:tree.

> You could try excluding gossip and log4j explicitly (by giving them 
> "provided" scope) and choosing your own logging implementation such as 
> logback.
>
> If you do not it will be an arbitrary consequence of classloading order as to 
> which logging system (gossip of log4j) ends up handling any log calls to 
> SLF4J.

Ok thanks, we'll look into this.

Is there anything which should be reported as a bug to either GMaven or 
Magnolia CMS, or is this just our combination of the two?

Nils.
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