Proguard obfuscator and reflection

i have problem

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Config proguard

http://ift.tt/2C8hjam

Class reflection

public class NmsUtil {

public static Class getNmsClass(final String nmsClassName) throws ClassNotFoundException {

return Class.forName("net.minecraft.server." +Bukkit.getServer().getClass().getPackage().getName().replace(".", ",").split(",")[3] + "." + nmsClassName);

}

public static String getServerVersion() {
    return Bukkit.getServer().getClass().getPackage().getName().substring(23);
}

public static void sendAction(Player p, String msg) {
    try {
        if (getServerVersion().equalsIgnoreCase("v1_12_R1") || getServerVersion().equalsIgnoreCase("v1_12_R2")) {
            final Object icbc = getNmsClass("ChatComponentText").getConstructor(String.class).newInstance(ChatColor.translateAlternateColorCodes('&', msg));
            final Object cmt = getNmsClass("ChatMessageType").getField("GAME_INFO").get(null);
            final Object ppoc = getNmsClass("PacketPlayOutChat").getConstructor(getNmsClass("IChatBaseComponent"), getNmsClass("ChatMessageType")).newInstance(icbc, cmt);
            final Object nmsp = p.getClass().getMethod("getHandle", (Class<?>[])new Class[0]).invoke(p, new Object[0]);
            final Object pcon = nmsp.getClass().getField("playerConnection").get(nmsp);
            pcon.getClass().getMethod("sendPacket", getNmsClass("Packet")).invoke(pcon, ppoc);
        }
        else if (getServerVersion().equalsIgnoreCase("v1_9_R1") || getServerVersion().equalsIgnoreCase("v1_9_R2") || getServerVersion().equalsIgnoreCase("v1_10_R1") || getServerVersion().equalsIgnoreCase("v1_11_R1")) {
            final Object icbc = getNmsClass("ChatComponentText").getConstructor(String.class).newInstance(ChatColor.translateAlternateColorCodes('&', msg));
            final Object ppoc2 = getNmsClass("PacketPlayOutChat").getConstructor(getNmsClass("IChatBaseComponent"), Byte.TYPE).newInstance(icbc, (byte)2);
            final Object nmsp2 = p.getClass().getMethod("getHandle", (Class<?>[])new Class[0]).invoke(p, new Object[0]);
            final Object pcon2 = nmsp2.getClass().getField("playerConnection").get(nmsp2);
            pcon2.getClass().getMethod("sendPacket", getNmsClass("Packet")).invoke(pcon2, ppoc2);
        }
        else if (getServerVersion().equalsIgnoreCase("v1_8_R2") || getServerVersion().equalsIgnoreCase("v1_8_R3")) {
            final Object icbc = getNmsClass("IChatBaseComponent$ChatSerializer").getMethod("a", String.class).invoke(null, "{'text': '" + msg + "'}");
            final Object ppoc2 = getNmsClass("PacketPlayOutChat").getConstructor(getNmsClass("IChatBaseComponent"), Byte.TYPE).newInstance(icbc, (byte)2);
            final Object nmsp2 = p.getClass().getMethod("getHandle", (Class<?>[])new Class[0]).invoke(p, new Object[0]);
            final Object pcon2 = nmsp2.getClass().getField("playerConnection").get(nmsp2);
            pcon2.getClass().getMethod("sendPacket", getNmsClass("Packet")).invoke(pcon2, ppoc2);
        }
        else {
            final Object icbc = getNmsClass("ChatSerializer").getMethod("a", String.class).invoke(null, "{'text': '" + msg + "'}");
            final Object ppoc2 = getNmsClass("PacketPlayOutChat").getConstructor(getNmsClass("IChatBaseComponent"), Byte.TYPE).newInstance(icbc, (byte)2);
            final Object nmsp2 = p.getClass().getMethod("getHandle", (Class<?>[])new Class[0]).invoke(p, new Object[0]);
            final Object pcon2 = nmsp2.getClass().getField("playerConnection").get(nmsp2);
            pcon2.getClass().getMethod("sendPacket", getNmsClass("Packet")).invoke(pcon2, ppoc2);
        }
    }
    catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException | NoSuchMethodException | SecurityException | ClassNotFoundException | InstantiationException | NoSuchFieldException ex2) {
        ex2.printStackTrace();
    }
}

}