Exception when connection is closed

[RobinCirex]

Hey I'm making a mod that has a connection between the server and the client using a SimpleNetworkWrapper

When a player disconnects, the server throws this exception

java.io.IOException: Eine bestehende Verbindung wurde softwaregesteuert
durch den Hostcomputer abgebrochen
	at sun.nio.ch.SocketDispatcher.write0(Native Method) ~[?:1.8.0_211]
	at sun.nio.ch.SocketDispatcher.write(Unknown Source) ~[?:1.8.0_211]
	at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source) ~[?:1.8.0_211]
	at sun.nio.ch.IOUtil.write(Unknown Source) ~[?:1.8.0_211]
	at sun.nio.ch.SocketChannelImpl.write(Unknown Source) ~[?:1.8.0_211]
	at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:417) ~[NioSocketChannel.class:4.1.9.Final]
	at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:856) ~[AbstractChannel$AbstractUnsafe.class:4.1.9.Final]
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:362) ~[AbstractNioChannel$AbstractNioUnsafe.class:4.1.9.Final]
	at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:823) ~[AbstractChannel$AbstractUnsafe.class:4.1.9.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.flush(DefaultChannelPipeline.java:1296) ~[DefaultChannelPipeline$HeadContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.ChannelDuplexHandler.flush(ChannelDuplexHandler.java:117) ~[ChannelDuplexHandler.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.flush(NetworkDispatcher.java:558) ~[NetworkDispatcher.class:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[AbstractChannelHandlerContext.class:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:802) ~[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.minecraft.network.NetworkManager$4.run(NetworkManager.java:261) [NetworkManager$4.class:?]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) [AbstractEventExecutor.class:4.1.9.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403) [SingleThreadEventExecutor.class:4.1.9.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:442) [NioEventLoop.class:4.1.9.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [SingleThreadEventExecutor$5.class:4.1.9.Final]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]

The german part basically means that the Hostcomputer closed the connection through the software. 

It doesn't really have any side effects, it still bothers me and wanted to ask how to fix this error

[Draco18s]

...and your mod's code?

[RobinCirex]

3 minutes ago, Draco18s said:

...and your mod's code?

well, there isn't much to show. 

This is the networkwrapper being initiated

	@EventHandler
	public void preInit(FMLPreInitializationEvent event) {
		networkWrapper = NetworkRegistry.INSTANCE.newSimpleChannel("settlementchannel");
		networkWrapper.registerMessage(Message.ClientHandler.class, Message.class, 0, Side.CLIENT);
		networkWrapper.registerMessage(TaxMessage.ClientHandler.class, TaxMessage.class, 1, Side.CLIENT);
		networkWrapper.registerMessage(ArmyMessage.ClientHandler.class, ArmyMessage.class, 2, Side.CLIENT);
		networkWrapper.registerMessage(UserMessage.ClientHandler.class, UserMessage.class, 3, Side.CLIENT);

Nothing happens in the PlayerLoggedOutEvent except this

	@SubscribeEvent
	public void onLeave(PlayerLoggedOutEvent event) {
		User user = SettlementMod.getInstance().getUserManager().getUser(event.player);
		if (user != null) {
			user.player = null;
		}
	}

which is just looping through an arraylist and has nothing to do with networking

there is also no "constant connection" the server only sends information to the client on a specific event

[Novârch]

1 hour ago, RobinCirex said:

NetworkRegistry.INSTANCE.newSimpleChannel("settlementchannel")

Not sure if this is it but doesn't this method have 4 parameters? It's in the docs and it seems pretty important. It seems like you are working for an unsupported version, please update to a modern version on Minecraft to receive support.

To break it down, FMLPreInitializationEvent no longer exists, @EventHandler no longer exists and your message registration code is completely different than it is in supported versions.

Edited June 10, 2020 by Novârch

[RobinCirex]

19 minutes ago, Novârch said:

Not sure if this is it but doesn't this method have 4 parameters? It's in the docs and it seems pretty important. It seems like you are working for an unsupported version, please update to a modern version on Minecraft to receive support.

To break it down, FMLPreInitializationEvent no longer exists, @EventHandler no longer exists and your message registration code is completely different than it is in supported versions.

Yes, this mod is for 1.12 as it's an addon for pixelmon and that only exists for 1.12 

[Draco18s]

1.12 is no longer supported here. Your options are:

• Update
• Go somewhere else for help