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IMessageHandler not sending IMessage when first player joins


Blackop778
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My mod sends a packet to clients that are supposed to send the contents back. The server doesn't have any problems sending the packet to clients, and the first player to connect receives the packet, but the return message never gets sent. If the first player reconnects then everything functions properly. To be clear I want the ModCheckMessageHandler to send a HasModMessage to the server, which never receives the message.

Client Handler: 

public static class ModCheckMessageHandler implements IMessageHandler<ModCheckMessage, HasModMessage> {

	@Override
	public HasModMessage onMessage(ModCheckMessage message, MessageContext ctx) {
	    MineCalc.LOGGER.info("Server has MineCalc installed");
	    return new HasModMessage(message.name);
	}

    }

Server Handler:

public static class HasModMessageHandler implements IMessageHandler<HasModMessage, IMessage> {

	@Override
	public IMessage onMessage(HasModMessage message, MessageContext ctx) {
	    MineCalc.LOGGER.info(message.name + " returned HasModMessage");
	    Calculate.hasMod.add(message.name);
	    return null;
	}

    }

How handlers are registered on client and server:

NetHub.NETWORKWRAPPER.registerMessage(ModCheckMessageHandler.class, ModCheckMessage.class,
		NetHub.packetDiscriminator++, Side.CLIENT);
NetHub.NETWORKWRAPPER.registerMessage(HasModMessageHandler.class, HasModMessage.class,
		NetHub.packetDiscriminator++, Side.SERVER);

What's wrong?

Edited by Blackop778
Being clear
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So I was writing a response but it turns out the vanilla client disconnects when I send it a modded packet from a forge server running my mod compiled into a jar, which it didn't do while running a server with gradle runServer. Maybe you can help me figure that out for now. Error message from server is "Internal Exception: io.netty.handler.codec.EncoderException: java.io.IOException: Can't serialize unregistered packet"

 

I'm creating a system that translates error messages server-side for players that don't have my mod installed. When a client connects the server sends a packet that contains the player that joined's name, which is message.name. The client sends the packet back to let the server know it has my mod and doesn't need pre-translated messages.

Edited by Blackop778
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Using the name and a static list for this is not ideal. You do not need to send anything in the packet, the server knows where packets come from. You do not need to send a packet to the client at all, just make the client send a packet when it connects. And then use a capability on EntityPlayer to store whether they have your mod.

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[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) [forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.12.jar:?]     at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?] Caused by: java.io.FileNotFoundException: https://dl.dropboxusercontent.com/u/47135879//Baubles-1.7.10-1.0.1.10.jar     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_291]     at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source) ~[?:1.8.0_291]     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:341) ~[DepLoader$DepLoadInst.class:?]     ... 19 more Caused by: java.io.FileNotFoundException: https://dl.dropboxusercontent.com/u/47135879//Baubles-1.7.10-1.0.1.10.jar     at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getHeaderFieldLong(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getContentLengthLong(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getContentLength(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.https.HttpsURLConnectionImpl.getContentLength(Unknown Source) ~[?:1.8.0_291]     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:340) ~[DepLoader$DepLoadInst.class:?]     ... 19 more [15:36:16] [main/ERROR] [LaunchWrapper]: Unable to launch java.lang.RuntimeException: A download error occured     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:354) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader$DepLoadInst.load(DepLoader.java:480) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader$DepLoadInst.loadDeps(DepLoader.java:466) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader$DepLoadInst.load(DepLoader.java:449) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader.load(DepLoader.java:584) ~[DepLoader.class:?]     at codechicken.core.launch.CodeChickenCorePlugin.<init>(CodeChickenCorePlugin.java:47) ~[CodeChickenCore-1.7.10-1.0.7.47-universal.jar:?]     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_291]     at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_291]     at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_291]     at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:501) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.12.jar:?]     at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?] Caused by: java.io.FileNotFoundException: https://dl.dropboxusercontent.com/u/47135879//Baubles-1.7.10-1.0.1.10.jar     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_291]     at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source) ~[?:1.8.0_291]     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:341) ~[DepLoader$DepLoadInst.class:?]     ... 19 more Caused by: java.io.FileNotFoundException: https://dl.dropboxusercontent.com/u/47135879//Baubles-1.7.10-1.0.1.10.jar     at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getHeaderFieldLong(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getContentLengthLong(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getContentLength(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.https.HttpsURLConnectionImpl.getContentLength(Unknown Source) ~[?:1.8.0_291]     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:340) ~[DepLoader$DepLoadInst.class:?]     ... 19 more Exception in thread "main" [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: cpw.mods.fml.relauncher.FMLSecurityManager$ExitTrappedException [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at cpw.mods.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:25) [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.SecurityManager.checkExit(Unknown Source) [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.Runtime.exit(Unknown Source) [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.System.exit(Unknown Source) [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraft.launchwrapper.Launch.launch(Launch.java:138) [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraft.launchwrapper.Launch.main(Launch.java:28)  
    • Hello! I've been updating old and abandoned mods to the newer versions of Forge as an hobby and to learn more and more of coding myself. I've happened to run into an outdated mod that, in 1.12.2 Forge, implements a new fluid: however, it does so by calling   and   which apparently isn't possible for 1.16.5 Forge. I need the first one to initialize the fluid and the latter to add it to the registry and use it elsewhere in the mod, so how would I do it? Also, is there anywhere I can follow Forge's updates and changes in its classes or structures? It's not the first time I've run into a problem of this sort. Sorry if my question sounds dumb. Thanks so much!
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