public static Spatial migrate(Spatial source) {
        Map<Skeleton, Armature> skeletonArmatureMap = new HashMap<>();
        animControlVisitor.setMappings(skeletonArmatureMap);
        source.depthFirstTraversal(animControlVisitor);
        skeletonControlVisitor.setMappings(skeletonArmatureMap);
        source.depthFirstTraversal(skeletonControlVisitor);
        return source;
    }
A private constructor to inhibit instantiation of this class.
jme3-core/src/main/java/com/jme3/anim/util/AnimMigrationUtils.java