Bug? Jserver AND JQMTTBroker

Hello,
I use JServer And JQMTTBroker in a same application.

This error ( oups, warning) happens :

Waiting for debugger to connect...
Program started.
Server HTTP starting
log4j:WARN No appenders could be found for logger (org.eclipse.jetty.util.log).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Emulated network latency: 100ms
Server started
Server QMTT starting
Persistent store file: D:\B4J\Projets\SCRATC~2\Objects\moquette_store.mapdb
Starting without ACL definition
Server binded host: 0.0.0.0, port: 12345
WebSocket is disabled
Server QMTT started

How i can correct this warning ?

Info : When I remove JQMTTBroker and all references, this warning disappears

You can ignore it if the broker and http server are working properly.

Broker and http server are working properly but ....
There is no log for QMTT and perhaps other problem when QMTT attempt to log ...