Hello evrybody.

In eclipse i launch server (server is in offline, eula=true mode). Then i launch client. Then i try to connect to localhost. And i get disconnected with this:

[09:36:36] [Client thread/INFO]: Connecting to localHost, 25565
[09:36:36] [Netty Client IO #3/INFO] [FML]: Server protocol version 2
[09:36:36] [Netty Client IO #3/INFO] [FML]: Attempting connection with missing mods [] at SERVER
[09:36:36] [Netty Client IO #3/INFO] [FML]: Injecting existing block and item data into this client instance
[09:36:36] [Netty Client IO #3/INFO] [FML]: Applying holder lookups
[09:36:36] [Netty Client IO #3/INFO] [FML]: Holder lookups applied
[09:36:36] [Client thread/INFO] [FML]: [Client thread] Client side modded connection established
[09:36:36] [Netty Client IO #3/ERROR] [FML]: NetworkDispatcher exception
io.netty.handler.codec.DecoderException: java.io.IOException: The received string length is longer than maximum allowed (23 > 20)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:263) ~[byteToMessageDecoder.class:?]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:131) ~[byteToMessageDecoder.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.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173) [byteToMessageDecoder.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.handler.timeout.ReadTimeoutHandler.channelRead(ReadTimeoutHandler.java:149) [ReadTimeoutHandler.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.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:100) [AbstractNioByteChannel$NioByteUnsafe.class:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:480) [NioEventLoop.class:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:447) [NioEventLoop.class:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:341) [NioEventLoop.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [singleThreadEventExecutor$2.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_25]
Caused by: java.io.IOException: The received string length is longer than maximum allowed (23 > 20)
at net.minecraft.network.PacketBuffer.readStringFromBuffer(PacketBuffer.java:185) ~[PacketBuffer.class:?]
at net.minecraft.network.play.server.S3FPacketCustomPayload.readPacketData(S3FPacketCustomPayload.java:42) ~[s3FPacketCustomPayload.class:?]
at net.minecraft.util.MessageDeserializer.decode(MessageDeserializer.java:46) ~[MessageDeserializer.class:?]
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:232) ~[byteToMessageDecoder.class:?]
... 16 more
[09:36:36] [Netty Client IO #3/ERROR] [FML]: NetworkDispatcher exception
io.netty.handler.codec.DecoderException: java.io.IOException: Packet was larger than I expected, found 91 bytes extra whilst reading packet 0
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:263) ~[byteToMessageDecoder.class:?]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:147) ~[byteToMessageDecoder.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.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173) [byteToMessageDecoder.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.handler.timeout.ReadTimeoutHandler.channelRead(ReadTimeoutHandler.java:149) [ReadTimeoutHandler.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.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:100) [AbstractNioByteChannel$NioByteUnsafe.class:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:480) [NioEventLoop.class:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:447) [NioEventLoop.class:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:341) [NioEventLoop.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [singleThreadEventExecutor$2.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_25]
Caused by: java.io.IOException: Packet was larger than I expected, found 91 bytes extra whilst reading packet 0
at net.minecraft.util.MessageDeserializer.decode(MessageDeserializer.java:50) ~[MessageDeserializer.class:?]
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:232) ~[byteToMessageDecoder.class:?]
... 16 more
[09:36:36] [Netty Client IO #3/ERROR] [FML]: NetworkDispatcher exception
io.netty.handler.codec.DecoderException: java.io.IOException: Packet was larger than I expected, found 82 bytes extra whilst reading packet 31
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:263) ~[byteToMessageDecoder.class:?]
at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:196) ~[byteToMessageDecoder.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelInactive(DefaultChannelHandlerContext.java:237) [DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.fireChannelInactive(DefaultChannelHandlerContext.java:223) [DefaultChannelHandlerContext.class:?]
at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:214) [byteToMessageDecoder.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelInactive(DefaultChannelHandlerContext.java:237) [DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.fireChannelInactive(DefaultChannelHandlerContext.java:223) [DefaultChannelHandlerContext.class:?]
at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) [ChannelInboundHandlerAdapter.class:?]
at io.netty.handler.timeout.ReadTimeoutHandler.channelInactive(ReadTimeoutHandler.java:143) [ReadTimeoutHandler.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelInactive(DefaultChannelHandlerContext.java:237) [DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.fireChannelInactive(DefaultChannelHandlerContext.java:223) [DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:767) [DefaultChannelPipeline.class:?]
at io.netty.channel.AbstractChannel$AbstractUnsafe$5.run(AbstractChannel.java:558) [AbstractChannel$AbstractUnsafe$5.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354) [singleThreadEventExecutor.class:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:348) [NioEventLoop.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [singleThreadEventExecutor$2.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_25]
Caused by: java.io.IOException: Packet was larger than I expected, found 82 bytes extra whilst reading packet 31
at net.minecraft.util.MessageDeserializer.decode(MessageDeserializer.java:50) ~[MessageDeserializer.class:?]
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:232) ~[byteToMessageDecoder.class:?]
... 16 more

And there's no any mention of any of my classes in error log. I can only think that it's caused indirectly by one of net parts of one of my mods. But why and how?

 

Thanks for help!

If you need anything else (code maybe) - just ask!

 

It mentions S3FPacketCustomPayload - are you sending any of those and, if so, can you show us the code for it?

 

EDIT: larsgerrits' answer is much more likely the cause.

Are you using the SimpleNetworkWrapper? If so, I think your channel name can't be longer then 20 characters.

Are you using the SimpleNetworkWrapper? If so, I think your channel name can't be longer then 20 characters.

Thanks, that worked! Never heard about it though...