public Joint findBone(String boneName) {
        verifyAddedToSpatial("access a bone");
        Joint result = skeleton.getJoint(boneName);
        return result;
    }
Access the named bone.
<p>
Allowed only when the control IS added to a spatial.

@param boneName the name of the skeleton bone to access
@return the pre-existing instance, or null if not found
jme3-jbullet/src/main/java/com/jme3/bullet/animation/DacLinks.java