Jump to content

[1.7.10] [Solved] io.netty.handler.codec.DecoderException


xandayn

Recommended Posts

Hey everyone, I have a question about an issue I'm having with netty, I've used it before and this is the first time I've ever encountered a bug quite like this.

 

io.netty.handler.codec.DecoderException: java.lang.NullPointerException: Undefined message for discriminator 21 in channel xan_prChannel
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:86) [FMLProxyPacket.class:?]
at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:241) [NetworkManager.class:?]
at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:182) [NetworkSystem.class:?]
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:726) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:349) [DedicatedServer.class:?]
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:614) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:485) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752) [MinecraftServer$2.class:?]
Caused by: java.lang.NullPointerException: Undefined message for discriminator 21 in channel xan_prChannel
at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:73) ~[FMLIndexedMessageToMessageCodec.class:?]
at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:17) ~[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:?]
... 13 more
[00:27:35] [server thread/ERROR] [FML]: SimpleChannelHandlerWrapper exception
io.netty.handler.codec.DecoderException: java.lang.NullPointerException: Undefined message for discriminator 21 in channel xan_prChannel
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:86) [FMLProxyPacket.class:?]
at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:241) [NetworkManager.class:?]
at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:182) [NetworkSystem.class:?]
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:726) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:349) [DedicatedServer.class:?]
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:614) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:485) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752) [MinecraftServer$2.class:?]
Caused by: java.lang.NullPointerException: Undefined message for discriminator 21 in channel xan_prChannel
at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:73) ~[FMLIndexedMessageToMessageCodec.class:?]
at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:17) ~[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:?]
... 13 more
[00:27:35] [server thread/ERROR] [FML]: SimpleChannelHandlerWrapper exception
io.netty.handler.codec.DecoderException: java.lang.NullPointerException: Undefined message for discriminator 21 in channel xan_prChannel
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:86) [FMLProxyPacket.class:?]
at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:241) [NetworkManager.class:?]
at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:182) [NetworkSystem.class:?]
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:726) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:349) [DedicatedServer.class:?]
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:614) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:485) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752) [MinecraftServer$2.class:?]
Caused by: java.lang.NullPointerException: Undefined message for discriminator 21 in channel xan_prChannel
at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:73) ~[FMLIndexedMessageToMessageCodec.class:?]
at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:17) ~[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:?]
... 13 more
[00:27:35] [server thread/ERROR] [FML]: There was a critical exception handling a packet on channel xan_prChannel
io.netty.handler.codec.DecoderException: java.lang.NullPointerException: Undefined message for discriminator 21 in channel xan_prChannel
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:86) [FMLProxyPacket.class:?]
at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:241) [NetworkManager.class:?]
at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:182) [NetworkSystem.class:?]
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:726) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:349) [DedicatedServer.class:?]
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:614) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:485) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752) [MinecraftServer$2.class:?]
Caused by: java.lang.NullPointerException: Undefined message for discriminator 21 in channel xan_prChannel
at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:73) ~[FMLIndexedMessageToMessageCodec.class:?]
at cpw.mods.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:17) ~[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:?]
... 13 more

 

Clearly it has an issue with discriminator 21, which makes sense, because I have no discriminator 21 registered, here's my packet registration (and yes it is being called)

 

    public static void initialize() {
        NETWORK = NetworkRegistry.INSTANCE.newSimpleChannel(References.MOD_CHANNEL_ID);
        NETWORK.registerMessage(ServerReceiveNewRecipe.Handler.class, ServerReceiveNewRecipe.class, 0, Side.SERVER);
        NETWORK.registerMessage(ServerRemoveOldRecipe.Handler.class, ServerRemoveOldRecipe.class, 1, Side.SERVER);
        NETWORK.registerMessage(ClientReceiveAllRecipesFromServer.Handler.class, ClientReceiveAllRecipesFromServer.class, 2, Side.CLIENT);
        NETWORK.registerMessage(ClientReceiveNewRecipeFromServer.Handler.class, ClientReceiveNewRecipeFromServer.class, 3, Side.CLIENT);
        NETWORK.registerMessage(ClientReceiveRecipeRemovalFromServer.Handler.class, ClientReceiveRecipeRemovalFromServer.class, 4, Side.CLIENT);
    }

 

All of the packets seem to work fine minus the ServerRemoveOldRecipe packet

 

//Imports removed to save space
public class ServerRemoveOldRecipe implements IMessage {

    private int handlerID = 0;
    private int recipeID = 0;

    public ServerRemoveOldRecipe() {}

    public ServerRemoveOldRecipe(int handlerID, int recipeID){
        this.handlerID = handlerID;
        this.recipeID = recipeID;
    }

    @Override
    public void fromBytes(ByteBuf byteBuf) {
        handlerID = byteBuf.getInt(0);
        recipeID = byteBuf.getInt(1);
    }

    @Override
    public void toBytes(ByteBuf byteBuf) {
        byteBuf.setInt(0, handlerID);
        byteBuf.setInt(1, recipeID);
    }

    public static class Handler implements IMessageHandler<ServerRemoveOldRecipe, IMessage> {

        @Override
        public IMessage onMessage(ServerRemoveOldRecipe message, MessageContext ctx) {
            if(ctx.side.isServer()) {
                RecipeRegistry.INSTANCE.removeRecipe(message.handlerID, message.recipeID);
                NetworkHandler.NETWORK.sendToAll(new ClientReceiveRecipeRemovalFromServer(message.handlerID, message.recipeID));
            }
            return null;
        }
    }
}

 

Here is the ClientReceiveRecipeRemovalFromServer class, although we never get this far as the crash happens before it, but for the sake of completeness.

 

//imports and package info removed to save space
public class ClientReceiveRecipeRemovalFromServer implements IMessage {

    private int handlerID = 0, position = 0;

    public ClientReceiveRecipeRemovalFromServer() {}

    public ClientReceiveRecipeRemovalFromServer(int handlerID, int position) {
        this.handlerID = handlerID;
        this.position = position;
    }

    @Override
    public void fromBytes(ByteBuf byteBuf) {
        handlerID = byteBuf.getInt(0);
        position = byteBuf.getInt(1);
    }

    @Override
    public void toBytes(ByteBuf byteBuf) {
        byteBuf.setInt(0, handlerID);
        byteBuf.setInt(1, position);
    }

    public static class Handler implements IMessageHandler<ClientReceiveRecipeRemovalFromServer, IMessage> {

        @Override
        public IMessage onMessage(ClientReceiveRecipeRemovalFromServer message, MessageContext ctx) {
            if(ctx.side.isClient()) {
                RecipeRegistry.INSTANCE.removeRecipe(message.handlerID, message.position);
            }
            return null;
        }
    }

}

 

And finally here's the code that actually sends the packet to the server

 

                //Some context for this code: It's within a GUI screen under actionPerformed(GuiButton) so this code is called from a client telling the server to remove a recipe, the server then tells all the clients to remove the same recipe.
                if(FMLCommonHandler.instance().getMinecraftServerInstance() == null) { 
                    //getMinecraftServerInstance() is null only if you're a client connected to a remote server I've found, which is when I want to send the packet, if theres a better way to detect that please let me know.
                    NetworkHandler.NETWORK.sendToServer(new ServerRemoveOldRecipe(RecipeRegistry.INSTANCE.getAliasIntID(handler.getID()), selected));
                } else {
                    handler.deleteRecipe(selected);
                }

 

I really have absolutely no idea why this is happening and I've spent probably 5 hours trying to figure it out now. Some help would be greatly appreciated, and if I've made a dumb mistake that I'm just blind to then I apologize but I really can't see one.

 

Link to comment
Share on other sites

Remove the integers from the

byteBuf.getInt();[code]

Don't PM me with questions. They will be ignored! Make a thread on the appropriate board for support.

 

1.12 -> 1.13 primer by williewillus.

 

1.7.10 and older versions of Minecraft are no longer supported due to it's age! Update to the latest version for support.

 

http://www.howoldisminecraft1710.today/

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Announcements



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.