Broker definition - activemq.xml - Fuse 6

I am wondering if anyone can help me with this.

I am accessing a topic using activeme:topic:TopicName in the
blueprint.xml(camel) and I have defined the broker for activemq(bean) in
activemq.xml in FUSE 6. But I am getting exception as username null or
password is invalid.

So, when I defined the activemq bean in my blueprint itself, everything
worked fine. Since I have around 40 blueprints in my projects which access
the same broker, it doesnt sound good to repeat the activemq bean
definition in all the bluprints. It would be ideal to define broker bean in
activemq.xml for once and just access the topci in all the blueprints I
need.

So what am I missing here?