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IndexArrayOutOfBoundsException on packet send

Posted March 26, 20187 yr

As I try to send a test packet (PacketHandler.SendToServer(new TestMessage(10))) to server I get this huge exception:

Spoiler


io.netty.handler.codec.EncoderException: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(4) exceeds writerIndex(1): UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 0, widx: 1, cap: 256)
	at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:106) ~[MessageToMessageEncoder.class:4.1.9.Final]
	at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116) ~[MessageToMessageCodec.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:801) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:831) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1032) ~[DefaultChannelPipeline.class:4.1.9.Final]
	at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:296) ~[AbstractChannel.class:4.1.9.Final]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.sendToServer(SimpleNetworkWrapper.java:289) [SimpleNetworkWrapper.class:?]
	at net.insane96mcp.iguanatweaks.network.PacketHandler.SendToServer(PacketHandler.java:19) [PacketHandler.class:?]
	at net.insane96mcp.iguanatweaks.modules.ModuleDrops.PlayerToss(ModuleDrops.java:76) [ModuleDrops.class:?]
	at net.insane96mcp.iguanatweaks.events.ItemToss.EventItemToss(ItemToss.java:11) [ItemToss.class:?]
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_33_ItemToss_EventItemToss_ItemTossEvent.invoke(.dynamic) [?:?]
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) [ASMEventHandler.class:?]
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179) [EventBus.class:?]
	at net.minecraftforge.common.ForgeHooks.onPlayerTossEvent(ForgeHooks.java:681) [ForgeHooks.class:?]
	at net.minecraft.entity.player.EntityPlayer.dropItem(EntityPlayer.java:780) [EntityPlayer.class:?]
	at net.minecraft.network.NetHandlerPlayServer.processPlayerDigging(NetHandlerPlayServer.java:679) [NetHandlerPlayServer.class:?]
	at net.minecraft.network.play.client.CPacketPlayerDigging.processPacket(CPacketPlayerDigging.java:56) [CPacketPlayerDigging.class:?]
	at net.minecraft.network.play.client.CPacketPlayerDigging.processPacket(CPacketPlayerDigging.java:12) [CPacketPlayerDigging.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:21) [PacketThreadUtil$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_161]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_161]
	at net.minecraft.util.Util.runTask(Util.java:53) [Util.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:796) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:741) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:590) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]
Caused by: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(4) exceeds writerIndex(1): UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 0, widx: 1, cap: 256)
	at io.netty.buffer.AbstractByteBuf.checkReadableBytes0(AbstractByteBuf.java:1396) ~[AbstractByteBuf.class:4.1.9.Final]
	at io.netty.buffer.AbstractByteBuf.readInt(AbstractByteBuf.java:766) ~[AbstractByteBuf.class:4.1.9.Final]
	at net.minecraft.network.PacketBuffer.readInt(PacketBuffer.java:953) ~[PacketBuffer.class:?]
	at net.insane96mcp.iguanatweaks.network.TestMessage.toBytes(TestMessage.java:20) ~[TestMessage.class:?]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleIndexedCodec.encodeInto(SimpleIndexedCodec.java:30) ~[SimpleIndexedCodec.class:?]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleIndexedCodec.encodeInto(SimpleIndexedCodec.java:26) ~[SimpleIndexedCodec.class:?]
	at net.minecraftforge.fml.common.network.FMLIndexedMessageToMessageCodec.encode(FMLIndexedMessageToMessageCodec.java:71) ~[FMLIndexedMessageToMessageCodec.class:?]
	at io.netty.handler.codec.MessageToMessageCodec$1.encode(MessageToMessageCodec.java:67) ~[MessageToMessageCodec$1.class:4.1.9.Final]
	at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:88) ~[MessageToMessageEncoder.class:4.1.9.Final]
	... 29 more
Mar 26, 2018 12:03:38 PM io.netty.channel.embedded.EmbeddedChannel recordException
WARNING: More than one exception was raised. Will report only the first one and log others.
io.netty.handler.codec.EncoderException: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(4) exceeds writerIndex(1): UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 0, widx: 1, cap: 256)
	at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:106)
	at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738)
	at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:801)
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814)
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794)
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:831)
	at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1032)
	at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:296)
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.sendToServer(SimpleNetworkWrapper.java:289)
	at net.insane96mcp.iguanatweaks.network.PacketHandler.SendToServer(PacketHandler.java:19)
	at net.insane96mcp.iguanatweaks.modules.ModuleDrops.PlayerToss(ModuleDrops.java:76)
	at net.insane96mcp.iguanatweaks.events.ItemToss.EventItemToss(ItemToss.java:11)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_33_ItemToss_EventItemToss_ItemTossEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
	at net.minecraftforge.common.ForgeHooks.onPlayerTossEvent(ForgeHooks.java:681)
	at net.minecraft.entity.player.EntityPlayer.dropItem(EntityPlayer.java:780)
	at net.minecraft.network.NetHandlerPlayServer.processPlayerDigging(NetHandlerPlayServer.java:679)
	at net.minecraft.network.play.client.CPacketPlayerDigging.processPacket(CPacketPlayerDigging.java:56)
	at net.minecraft.network.play.client.CPacketPlayerDigging.processPacket(CPacketPlayerDigging.java:12)
	at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:21)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at net.minecraft.util.Util.runTask(Util.java:53)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:796)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:741)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:590)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(4) exceeds writerIndex(1): UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 0, widx: 1, cap: 256)
	at io.netty.buffer.AbstractByteBuf.checkReadableBytes0(AbstractByteBuf.java:1396)
	at io.netty.buffer.AbstractByteBuf.readInt(AbstractByteBuf.java:766)
	at net.minecraft.network.PacketBuffer.readInt(PacketBuffer.java:953)
	at net.insane96mcp.iguanatweaks.network.TestMessage.toBytes(TestMessage.java:20)
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleIndexedCodec.encodeInto(SimpleIndexedCodec.java:30)
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleIndexedCodec.encodeInto(SimpleIndexedCodec.java:26)
	at net.minecraftforge.fml.common.network.FMLIndexedMessageToMessageCodec.encode(FMLIndexedMessageToMessageCodec.java:71)
	at io.netty.handler.codec.MessageToMessageCodec$1.encode(MessageToMessageCodec.java:67)
	at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:88)
	... 29 more

PacketHandler

Spoiler


package net.insane96mcp.iguanatweaks.network;

import net.insane96mcp.iguanatweaks.IguanaTweaks;
import net.minecraftforge.fml.common.network.NetworkRegistry;
import net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper;
import net.minecraftforge.fml.relauncher.Side;

public class PacketHandler {
	public static final SimpleNetworkWrapper INSTANCE = NetworkRegistry.INSTANCE.newSimpleChannel(IguanaTweaks.MOD_ID);
	private static int discriminator = 0;
	
	public static void Init() {
		INSTANCE.registerMessage(TestMessageHandler.class, TestMessage.class, discriminator++, Side.SERVER);
	}
	
	public static void SendToServer(TestMessage message) {
		INSTANCE.sendToServer(message);
	}
}

IMessage implementation

Spoiler


package net.insane96mcp.iguanatweaks.network;

import io.netty.buffer.ByteBuf;
import net.minecraftforge.fml.common.network.simpleimpl.IMessage;

public class TestMessage implements IMessage {

	public int toSend;
	public TestMessage(int toSend) {
		this.toSend = toSend;
	}
	
	@Override
	public void fromBytes(ByteBuf buf) {
		buf.writeInt(toSend);
	}

	@Override
	public void toBytes(ByteBuf buf) {
		this.toSend = buf.readInt();
	}

}

IMessageHandler implementation

Spoiler


package net.insane96mcp.iguanatweaks.network;

import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.init.Items;
import net.minecraft.item.ItemStack;
import net.minecraftforge.fml.common.network.simpleimpl.IMessage;
import net.minecraftforge.fml.common.network.simpleimpl.IMessageHandler;
import net.minecraftforge.fml.common.network.simpleimpl.MessageContext;

public class TestMessageHandler implements IMessageHandler<TestMessage, IMessage> {

	@Override
	public IMessage onMessage(TestMessage message, MessageContext ctx) {
		EntityPlayerMP serverPlayer = ctx.getServerHandler().player;
		int amount = message.toSend;
		serverPlayer.getServerWorld().addScheduledTask(() -> {
			serverPlayer.inventory.addItemStackToInventory(new ItemStack(Items.DIAMOND, amount));
	    });
		return null;
	}

}

The Packet handler has been registered in the PreInit of the CommonProxy with PacketHandler.Init()
I really don't know what I'm doing wrong since I've followed the docs of SimpleImpl

Edited March 26, 20187 yr by Insane96MCP

Quote

March 26, 20187 yr

You've got your fromBytes and toBytes implementations around the wrong way. fromBytes needs to read the data from the byte buffer into the fields of the packet; toBytes needs to write the data from the fields of the packet into the byte buffer.

Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.

Quote

March 26, 20187 yr

Author

How do I handle messages from server to client?

I can use ctx.getServerHandler().player to get the PlayerMP, but how do I get the client one?

Quote

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AydenPulse

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IndexArrayOutOfBoundsException on packet send

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