public void unlinkBone(String boneName) {
        if (!hasBoneLink(boneName)) {
            String msg = "No linked bone named " + boneName;
            throw new IllegalArgumentException(msg);
        }
        verifyNotAddedToSpatial("unlink a bone");

        jointMap.remove(boneName);
        blConfigMap.remove(boneName);
    }
Unlink the BoneLink of the named bone.
<p>
Allowed only when the control is NOT added to a spatial.

@param boneName the name of the bone to unlink (not null, not empty)
jme3-jbullet/src/main/java/com/jme3/bullet/animation/DacConfiguration.java