Update an inventory name while opened without NMS

TitleUpdater.java

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.bukkit.ChatColor;
import org.bukkit.entity.Player;

import com.gmail.justisroot.autoecon.data.ServerSpecs;

public abstract class TitleUpdater {

	private static Method getHandle, sendPacket;
	private static Field activeContainerField, windowIdField, playerConnectionField;
	private static Constructor<?> chatMessageConstructor, packetPlayOutOpenWindowConstructor;

	static {
		try {
			getHandle = ServerSpecs.getObcClass("entity.CraftPlayer").getMethod("getHandle");
			chatMessageConstructor = ServerSpecs.getNmsClass("ChatMessage").getConstructor(String.class, Object[].class);
			Class<?> nmsPlayer = ServerSpecs.getNmsClass("EntityPlayer");
			activeContainerField = nmsPlayer.getField("activeContainer");
			windowIdField = ServerSpecs.getNmsClass("Container").getField("windowId");
			playerConnectionField = nmsPlayer.getField("playerConnection");
			packetPlayOutOpenWindowConstructor = ServerSpecs.getNmsClass("PacketPlayOutOpenWindow").getConstructor(Integer.TYPE, String.class, ServerSpecs.getNmsClass("IChatBaseComponent"), Integer.TYPE);
			sendPacket = ServerSpecs.getNmsClass("PlayerConnection").getMethod("sendPacket", ServerSpecs.getNmsClass("Packet"));
			// SeverSpecs.getNmsClass(nmsClassName) can be replaced with Class.forName("net.minecraft.server." + VERSION + "." + nmsClassName)
		} catch (NoSuchMethodException | SecurityException | ClassNotFoundException | NoSuchFieldException e) {
			e.printStackTrace();
		}
	}

	public static void update(final Player p, String title) {
		if (p.getOpenInventory().getTopInventory().getName().equalsIgnoreCase("container.crafting")) return;
		try {
			Object handle = getHandle.invoke(p);
			Object message = chatMessageConstructor.newInstance(title, new Object[0]);
			Object container = activeContainerField.get(handle);
			Object windowId = windowIdField.get(container);
			Object packet = packetPlayOutOpenWindowConstructor.newInstance(windowId, "minecraft:chest", message, p.getOpenInventory().getTopInventory().getSize());
			Object playerConnection = playerConnectionField.get(handle);
			sendPacket.invoke(playerConnection, packet);
		} catch (IllegalArgumentException | IllegalAccessException | InstantiationException | InvocationTargetException e) {
			e.printStackTrace();
		}
		p.updateInventory();
	}
}