PingRefl.java

    private static Method getHandleMethod;
    private static Field pingField;

    private static int getPing(Player player) {
        try {
            if (getHandleMethod == null) {
                getHandleMethod = player.getClass().getDeclaredMethod("getHandle");
                getHandleMethod.setAccessible(true);
            }
            Object entityPlayer = getHandleMethod.invoke(player);
            if (pingField == null) {
                pingField = entityPlayer.getClass().getDeclaredField("ping");
                pingField.setAccessible(true);
            }
            return pingField.getInt(entityPlayer);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return -1;
    }