Illegal Argument Exception thrown

[MillzyDev]

Hello, I'm attempting to make a discord application using your RCON library, I followed your example closely and ive double checked that all the credentials are correct, however I get the IllegalArgumentException that gets thrown

        final MinecraftRconService minecraftRconService = new MinecraftRconService(
                new RconDetails("play.pintodog.com", 25565, "secret_password"),
                ConnectOptions.defaults()
        );

        minecraftRconService.connectBlocking(Duration.ofSeconds(3));

        final MinecraftRcon minecraftRcon = minecraftRconService.minecraftRcon().orElseThrow(IllegalStateException::new); // fails here

        final CustomCommand customCommand = new CustomCommand(String.join(" ", args));

        Future<RconResponse> response = minecraftRcon.sendAsync(customCommand);

        Logger.info("Executed RCON Command: " + String.join(" ", args));

i'll link my CustomCommand class here: https://pastebin.com/me4KjDYy,
any help would be very much appreciated

[MrGraversen]

Hi, thanks for reaching out.

What is the console output when running?
Which version of the library are you using? 0.0.16?

Even if I don't know your RCON password, I can see:

java.lang.IllegalArgumentException: capacity < 0: (-551943712 < 0)
	at java.nio.Buffer.createCapacityException(Buffer.java:256) ~[?:?]
	at java.nio.ByteBuffer.allocate(ByteBuffer.java:347) ~[?:?]
	at io.graversen.minecraft.rcon.MinecraftClient.readData(MinecraftClient.java:133) ~[minecraft-rcon-0.0.16.jar:?]
	at io.graversen.minecraft.rcon.MinecraftClient.readResponse(MinecraftClient.java:110) ~[minecraft-rcon-0.0.16.jar:?]
	at io.graversen.minecraft.rcon.MinecraftClient.lambda$doSynchronousSend$0(MinecraftClient.java:100) ~[minecraft-rcon-0.0.16.jar:?]
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264) ~[?:?]
	at java.util.concurrent.FutureTask.run(FutureTask.java) ~[?:?]
	... 3 more

It seems to attempt to read a negative amount of bytes, which could indicate that the underlying AsynchronousSocketChannel is in fact closed.

I don't know how you are hosting this Minecraft server, but be wary of going through a reverse proxy, as it is quite challenging to make work without protocol knowledge.

In either case – I'm running this library on 0.0.16 in production with a Spring Boot web application on top of it for many months now, so the library has some battle testing even across several Minecraft updates etc. 😄

[MillzyDev]

Thanks for the quick reply!

What is the console output when running?

12:15:28.683 [JDA MainWS-ReadThread] ERROR net.dv8tion.jda.api.JDA - One of the EventListeners had an uncaught exception
java.lang.IllegalStateException: null
	at java.util.Optional.orElseThrow(Optional.java:403) ~[?:?]
	at com.pintodog.autoadmin.command.commands.RCON.handle(RCON.java:39) ~[classes/:?]
	at com.pintodog.autoadmin.CommandManager.handle(CommandManager.java:103) ~[classes/:?]
	at com.pintodog.autoadmin.Listener.onGuildMessageReceived(Listener.java:137) ~[classes/:?]
	at net.dv8tion.jda.api.hooks.ListenerAdapter.onEvent(ListenerAdapter.java:481) ~[JDA-4.3.0_291.jar:4.3.0_291]
	at net.dv8tion.jda.api.hooks.InterfacedEventManager.handle(InterfacedEventManager.java:96) [JDA-4.3.0_291.jar:4.3.0_291]
	at net.dv8tion.jda.internal.hooks.EventManagerProxy.handleInternally(EventManagerProxy.java:88) [JDA-4.3.0_291.jar:4.3.0_291]
	at net.dv8tion.jda.internal.hooks.EventManagerProxy.handle(EventManagerProxy.java:70) [JDA-4.3.0_291.jar:4.3.0_291]
	at net.dv8tion.jda.internal.JDAImpl.handleEvent(JDAImpl.java:160) [JDA-4.3.0_291.jar:4.3.0_291]
	at net.dv8tion.jda.internal.handle.MessageCreateHandler.handleInternally(MessageCreateHandler.java:97) [JDA-4.3.0_291.jar:4.3.0_291]
	at net.dv8tion.jda.internal.handle.SocketHandler.handle(SocketHandler.java:36) [JDA-4.3.0_291.jar:4.3.0_291]
	at net.dv8tion.jda.internal.requests.WebSocketClient.onDispatch(WebSocketClient.java:952) [JDA-4.3.0_291.jar:4.3.0_291]
	at net.dv8tion.jda.internal.requests.WebSocketClient.onEvent(WebSocketClient.java:839) [JDA-4.3.0_291.jar:4.3.0_291]
	at net.dv8tion.jda.internal.requests.WebSocketClient.handleEvent(WebSocketClient.java:817) [JDA-4.3.0_291.jar:4.3.0_291]
	at net.dv8tion.jda.internal.requests.WebSocketClient.onBinaryMessage(WebSocketClient.java:990) [JDA-4.3.0_291.jar:4.3.0_291]
	at com.neovisionaries.ws.client.ListenerManager.callOnBinaryMessage(ListenerManager.java:385) [nv-websocket-client-2.14.jar:?]
	at com.neovisionaries.ws.client.ReadingThread.callOnBinaryMessage(ReadingThread.java:276) [nv-websocket-client-2.14.jar:?]
	at com.neovisionaries.ws.client.ReadingThread.handleBinaryFrame(ReadingThread.java:996) [nv-websocket-client-2.14.jar:?]
	at com.neovisionaries.ws.client.ReadingThread.handleFrame(ReadingThread.java:755) [nv-websocket-client-2.14.jar:?]
	at com.neovisionaries.ws.client.ReadingThread.main(ReadingThread.java:108) [nv-websocket-client-2.14.jar:?]
	at com.neovisionaries.ws.client.ReadingThread.runMain(ReadingThread.java:64) [nv-websocket-client-2.14.jar:?]
	at com.neovisionaries.ws.client.WebSocketThread.run(WebSocketThread.java:45) [nv-websocket-client-2.14.jar:?]

Which version of the library are you using? 0.0.16?

I am using the latest version, yes

[MrGraversen]

Have you verified the RCON exchange using another client?

[MillzyDev]

How so?

[MrGraversen]

My guess is currently that some network issue prevents you from connecting. However, I am unsure how to assist you with this