Add files

src/main/java/net/citizensnpcs/npc/ai/NPCHolder.java

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+package net.citizensnpcs.npc.ai;
+
+import net.citizensnpcs.api.npc.NPC;
+
+public interface NPCHolder {
+    public NPC getNPC();
+}

src/main/java/net/citizensnpcs/npc/network/EmptyNetHandler.java

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+package net.citizensnpcs.npc.network;
+
+import net.minecraft.server.EntityPlayer;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.NetServerHandler;
+import net.minecraft.server.NetworkManager;
+import net.minecraft.server.Packet;
+import net.minecraft.server.Packet102WindowClick;
+import net.minecraft.server.Packet106Transaction;
+import net.minecraft.server.Packet10Flying;
+import net.minecraft.server.Packet130UpdateSign;
+import net.minecraft.server.Packet14BlockDig;
+import net.minecraft.server.Packet15Place;
+import net.minecraft.server.Packet16BlockItemSwitch;
+import net.minecraft.server.Packet255KickDisconnect;
+import net.minecraft.server.Packet28EntityVelocity;
+import net.minecraft.server.Packet3Chat;
+import net.minecraft.server.Packet51MapChunk;
+
+public class EmptyNetHandler extends NetServerHandler {
+    public EmptyNetHandler(MinecraftServer minecraftServer, NetworkManager networkManager, EntityPlayer entityPlayer) {
+        super(minecraftServer, networkManager, entityPlayer);
+    }
+
+    @Override
+    public void a() {
+    }
+
+    @Override
+    public void a(Packet102WindowClick packet) {
+    }
+
+    @Override
+    public void a(Packet106Transaction packet) {
+    }
+
+    @Override
+    public void a(Packet10Flying packet) {
+    }
+
+    @Override
+    public void a(Packet130UpdateSign packet) {
+    }
+
+    @Override
+    public void a(Packet14BlockDig packet) {
+    }
+
+    @Override
+    public void a(Packet15Place packet) {
+    }
+
+    @Override
+    public void a(Packet16BlockItemSwitch packet) {
+    }
+
+    @Override
+    public void a(Packet255KickDisconnect packet) {
+    }
+
+    @Override
+    public void a(Packet28EntityVelocity packet) {
+    }
+
+    @Override
+    public void a(Packet3Chat packet) {
+    }
+
+    @Override
+    public void a(Packet51MapChunk packet) {
+    }
+
+    @Override
+    public void a(String string, Object[] objects) {
+    }
+
+    @Override
+    public void sendMessage(String string) {
+    }
+
+    @Override
+    public void sendPacket(Packet packet) {
+    }
+}

src/main/java/net/citizensnpcs/npc/network/EmptyNetworkManager.java

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+package net.citizensnpcs.npc.network;
+
+import java.lang.reflect.Field;
+import java.net.Socket;
+
+import net.minecraft.server.NetHandler;
+import net.minecraft.server.NetworkManager;
+import net.minecraft.server.Packet;
+
+public class EmptyNetworkManager extends NetworkManager {
+
+    public EmptyNetworkManager(Socket socket, String string, NetHandler netHandler) {
+        super(socket, string, netHandler);
+
+        try {
+            // the field above the 3 synchronized lists
+            Field f = NetworkManager.class.getDeclaredField("l");
+            f.setAccessible(true);
+            f.set(this, false);
+        } catch (Exception e) {
+        }
+    }
+
+    @Override
+    public void a() {
+    }
+
+    @Override
+    public void a(NetHandler netHandler) {
+    }
+
+    @Override
+    public void a(String s, Object... objects) {
+    }
+
+    @Override
+    public void b() {
+    }
+
+    @Override
+    public void d() {
+    }
+
+    @Override
+    public int e() {
+        return 0;
+    }
+
+    @Override
+    public void queue(Packet packet) {
+    }
+}

src/main/java/net/citizensnpcs/npc/network/EmptySocket.java

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+package net.citizensnpcs.npc.network;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.Socket;
+
+public class EmptySocket extends Socket {
+
+    @Override
+    public InputStream getInputStream() {
+        return new ByteArrayInputStream(new byte[10]);
+    }
+
+    @Override
+    public OutputStream getOutputStream() {
+        return new ByteArrayOutputStream();
+    }
+}