JBoss A-MQ 6.1 379 has guava jar version 14 whereas JBoss Fuse uses both versions 14 and 15 for different features. The JBoss Fuse plugin must use the base fabric dependency version 14 to connect to the Fabric registry. Since it cannot find this jar version, A-MQ discovery fails. This issue can be temporarily fixed by adding guava version 14 to the system directory, but a patch is needed for a long term fix that discovers the product OOTB.