Hello,

I'm trying to port my mod CraftingManager to 1.7.2, i read this tutorial for packets: http://www.minecraftforge.net/wiki/Tutorials/Packet_Handling

 

i did it almost the same way here are my classes

CraftingPacket

 

 

package com.creativemd.craftingmanager.common;

 

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map.Entry;

import java.util.Set;

 

import cpw.mods.fml.relauncher.Side;

import cpw.mods.fml.relauncher.SideOnly;

import net.minecraft.entity.player.EntityPlayer;

import io.netty.buffer.ByteBuf;

 

public abstract interface CraftingPacket {

 

    public abstract void readBytes(ByteBuf bytes);

    public abstract void writeBytes(ByteBuf bytes);

    public abstract void executeClient(EntityPlayer player);

    public abstract void executeServer(EntityPlayer player);

}

 

 

 

PacketDisabled

 

 

package com.creativemd.craftingmanager.common.packets;

 

import java.util.ArrayList;

import java.util.List;

 

import io.netty.buffer.ByteBuf;

import net.minecraft.entity.player.EntityPlayer;

import net.minecraft.util.ChatComponentTranslation;

 

import com.creativemd.craftingmanager.common.CraftingPacket;

import com.creativemd.craftingmanager.core.CraftingManagerMod;

import com.creativemd.craftingmanager.core.RecipeHelper;

 

import cpw.mods.fml.common.network.ByteBufUtils;

import cpw.mods.fml.common.network.FMLOutboundHandler;

import cpw.mods.fml.relauncher.Side;

 

public class PacketDisabled implements CraftingPacket{

 

public String[] recipes;

 

public PacketDisabled(String[] recipes) {

this.recipes = recipes;

}

 

@Override

public void readBytes(ByteBuf bytes) {

int count = bytes.readInt();

recipes = new String[count];

for(int zahl = 0; zahl < recipes.length; zahl++)

recipes[zahl] = ByteBufUtils.readUTF8String(bytes);

 

//Save information

List disabled = new ArrayList();

for(int zahl = 0; zahl < recipes.length; zahl++)

disabled.add(recipes[zahl]);

CraftingManagerMod.disabledRecipes.clear();

for(int zahl = 0; zahl < CraftingManagerMod.allrecipes.size(); zahl++)

if(disabled.contains(RecipeHelper.RecipeToStringDisabled(CraftingManagerMod.allrecipes.get(zahl))))

CraftingManagerMod.disabledRecipes.add(CraftingManagerMod.allrecipes.get(zahl));

CraftingManagerMod.updateRecipes();

}

 

@Override

public void writeBytes(ByteBuf bytes) {

bytes.writeInt(recipes.length);

for(int zahl = 0; zahl < recipes.length; zahl++)

ByteBufUtils.writeUTF8String(bytes, recipes[zahl]);

}

 

@Override

public void executeClient(EntityPlayer player) {

player.addChatComponentMessage(new ChatComponentTranslation("Disabled " + recipes.length + " Recipes"));

}

 

@Override

public void executeServer(EntityPlayer player) {

PacketHandler.sendToAllPlayers(PacketHandler.getDisabledPacket());

}

 

}

 

 

 

Channel Register

 

 

channels = NetworkRegistry.INSTANCE.newChannel("CMPacket", new ChannelHandler());

 

 

 

Sending Packet

 

 

@SubscribeEvent

public void onPlayerLogin(PlayerLoggedInEvent event) {

if(event.player instanceof EntityPlayerMP)

{

if(((EntityPlayerMP) event.player).mcServer.isSinglePlayer())

CraftingManagerMod.instance.load(new FMLPostInitializationEvent(null, null));

PacketHandler.sendToPlayer(PacketHandler.getDisabledPacket(), event.player);

PacketHandler.sendToPlayer(PacketHandler.getAddedPacket(), event.player);

}

}

 

 

 

sendToPlayer & getDisabledPacket

 

 

public static PacketDisabled getDisabledPacket()

{

String[] recipes = new String[CraftingManagerMod.disabledRecipes.size()];

for(int zahl = 0; zahl < recipes.length; zahl++)

recipes[zahl] = RecipeHelper.RecipeToStringDisabled(CraftingManagerMod.disabledRecipes.get(zahl));

return new PacketDisabled(recipes);

}

public static void sendToPlayer(CraftingPacket packet, EntityPlayer player)

{

CraftingManagerMod.channels.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGET).set(FMLOutboundHandler.OutboundTarget.PLAYER);

CraftingManagerMod.channels.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGETARGS).set(player);

CraftingManagerMod.channels.get(Side.SERVER).writeOutbound(packet);

}

 

 

 

but something goes wrong , i have no idea why this error comes up:

 

 

[Client thread/ERROR] [FML]: There was a critical exception handling a packet on channel CMPacket

io.netty.handler.codec.DecoderException: java.lang.InstantiationException: com.creativemd.craftingmanager.common.packets.PacketDisabled

at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:99) ~[MessageToMessageDecoder.class:?]

at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111) ~[MessageToMessageCodec.class:?]

at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) ~[DefaultChannelHandlerContext.class:?]

at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) ~[DefaultChannelHandlerContext.class:?]

at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) ~[DefaultChannelPipeline.class:?]

at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:169) ~[EmbeddedChannel.class:?]

at cpw.mods.fml.common.network.internal.FMLProxyPacket.processPacket(FMLProxyPacket.java:80) [FMLProxyPacket.class:?]

at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:232) [NetworkManager.class:?]

at net.minecraft.client.Minecraft.runTick(Minecraft.java:2118) [Minecraft.class:?]

at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:995) [Minecraft.class:?]

at net.minecraft.client.Minecraft.run(Minecraft.java:910) [Minecraft.class:?]

at net.minecraft.client.main.Main.main(Main.java:112) [Main.class:?]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_25]

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_25]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_25]

at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_25]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:134) [launchwrapper-1.9.jar:?]

at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]

Caused by: java.lang.InstantiationException: com.creativemd.craftingmanager.common.packets.PacketDisabled

at java.lang.Class.newInstance(Unknown Source) ~[?:1.7.0_25]

at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:73) ~[FMLIndexedMessageToMessageCodec.class:?]

at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:16) ~[FMLIndexedMessageToMessageCodec.class:?]

at io.netty.handler.codec.MessageToMessageCodec$2.decode(MessageToMessageCodec.java:81) ~[MessageToMessageCodec$2.class:?]

at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89) ~[MessageToMessageDecoder.class:?]

... 17 more

 

 

 

Can anyone help me? I tried everything, but this error comes up everytime

The crash report indicates you have an instantiation exception for the PacketDisabled class.

 

I think you need to add a default constructor to the PacketDisabled class:

public PacketDisabled() {
   }

Thank you now everything works fine you are awesome