After deployment my blueprint bundle stays in GracePeriod status

Issue

I am trying to instantiate a "cxf:cxfEndpoint" in my camel route. But the bundle stays in "GracePeriod" status with following log:

09:21:27,539 | INFO  | rint Extender: 1 | BlueprintContainerImpl           | 21 - org.apache.aries.blueprint.core - 1.4.2 | Bundle xxx.xxx.xxx is waiting for namespace handlers [http://camel.apache.org/schema/cxf]
09:21:27,539 | DEBUG | rint Extender: 1 | BlueprintEventDispatcher         | 21 - org.apache.aries.blueprint.core - 1.4.2 | Sending blueprint container event BlueprintEvent[type=GRACE_PERIOD, dependencies=[(&(objectClass=org.apache.aries.blueprint.NamespaceHandler)(osgi.service.blueprint.namespace=http://camel.apache.org/schema/cxf))]] for bundle xxx.xxx.xxx