Spawn ItemFrame (WITH REFLECTION)

    private static String mcPackage = null;
    private static Class classItemFrame = null;
    private static Constructor constructor = null;
    private static Method worldGetHandle = null;
    private static Method worldAddEntity = null;
    private static Method itemFrameGetBukkitEntity = null;
    public static ItemFrame spawnItemFrame(Location loc, BlockFace bf) throws Exception {
        int side = 0;
        if(bf == BlockFace.SOUTH) {
            side = 0;
        } else if(bf == BlockFace.WEST) {
            side = 1;
        } else if(bf == BlockFace.NORTH) {
            side = 2;
        } else if(bf == BlockFace.EAST) {
            side = 3;
        }
        World w = loc.getWorld();

        // CACHE CRAFTWORLD METHOD
        if(worldGetHandle == null) worldGetHandle = w.getClass().getMethod("getHandle");

        // GET NMS WORLD
        Object mcWorld = worldGetHandle.invoke(w);

        // CACHE NMS ELEMENTS
        if(mcPackage == null) mcPackage = mcWorld.getClass().getPackage().getName();
        if(classItemFrame == null) classItemFrame = Class.forName(mcPackage + ".EntityItemFrame");
        if(worldAddEntity == null) worldAddEntity = mcWorld.getClass().getMethod("addEntity", classItemFrame.getSuperclass().getSuperclass());
        if(itemFrameGetBukkitEntity == null) itemFrameGetBukkitEntity = classItemFrame.getMethod("getBukkitEntity");
        if(constructor == null) constructor = classItemFrame.getConstructor(mcWorld.getClass().getSuperclass(), int.class, int.class, int.class, int.class);

        // CREATE A NEW ITEMFRAME
        Object mcItemFrame = constructor.newInstance(mcWorld, loc.getBlockX(), loc.getBlockY(), loc.getBlockZ(), side);
        // ADDS THE ITEMFRAME TO THE WORLD
        worldAddEntity.invoke(mcWorld, mcItemFrame);
        // FINALLY, RETURNS THE BUKKIT ITEMFRAME
        return (ItemFrame)classItemFrame.getMethod("getBukkitEntity").invoke(mcItemFrame);
    }