this bit of 6.1.0.Beta2 feature XML doesn't load in karaf 2.3.3 or fabric8:

<feature name="jbpm-commons" version="6.1.0.Beta2" description="jBPM Commons">
<bundle>wrap:mvn:javax.security/jacc/1.0</bundle>

as it can't be downloaded as the jar doesn't exist in maven central:
http://central.maven.org/maven2/javax/security/jacc/1.0/

Not sure how the above has ever worked unless someone's got an old cached jar in their local repo? Or is there some repo thats got it in?

Maybe it needs changing to this which has a jar in maven central?
http://central.maven.org/maven2/javax/security/jacc/javax.security.jacc-api/1.5/