[1.12.2] Data exchanging between Client and Server

IvanSteklow · May 13, 2018

Hello Modders! Sorry for my bad English

I have Tile Entity that have working time and I have GUI with Progress Bar that need this working time. And I don't know how to do it. Pls help

Block: *CLICK*

Tile Entity: *CLICK*

Container: *CLICK*

GUI: *CLICK*

Draco18s · May 13, 2018

Packets.

IvanSteklow · May 13, 2018

1 minute ago, Draco18s said:

Packets.

Can U give me some tutorials, pls?

Draco18s · May 13, 2018

https://mcforge.readthedocs.io/en/latest/networking/simpleimpl/

jabelar · May 13, 2018

As mentioned, the client and server are always only connected by a network connection (even when in "single player" integrated server mode). So you need network packets to communicate in both directions.

For most modding purposes, the built-in packets aren't always going to help, but sometimes you might want to look at them if you feel that what you're doing is likely also communicated by vanilla. For example, the container system already communicates the inventories and actions between client and server.

Tile entities have a data packet system (using tag compounds), so I think you can just hook into that.

For entities, with little bits of information there is a mechanism called data watcher (or I think that is old name, maybe data manager now).

Lastly, there is fully custom packets. There is a custom packet already available, but it is also easy to use Forge simple networking implementation.

IvanSteklow · May 13, 2018

1 hour ago, jabelar said:

As mentioned, the client and server are always only connected by a network connection (even when in "single player" integrated server mode). So you need network packets to communicate in both directions.

For most modding purposes, the built-in packets aren't always going to help, but sometimes you might want to look at them if you feel that what you're doing is likely also communicated by vanilla. For example, the container system already communicates the inventories and actions between client and server.

Tile entities have a data packet system (using tag compounds), so I think you can just hook into that.

For entities, with little bits of information there is a mechanism called data watcher (or I think that is old name, maybe data manager now).

Lastly, there is fully custom packets. There is a custom packet already available, but it is also easy to use Forge simple networking implementation.

So, I try to get 'TIME' from NBT, but I don't know why it didn't working. So, writeToNBT in my Tile Entity class looks like that:

	@Override
	public NBTTagCompound writeToNBT(NBTTagCompound compound) {
		super.writeToNBT(compound);
		compound.setInteger("time", this.time);
		compound.setInteger("maxTime", METAL_REFINERY_WORKTIME);
		compound.setTag("items", this.itemStackHandler.serializeNBT());
		return compound;
	}

And my GUI Screen Updater looks like that:

	@Override
	public void updateScreen() {
		NBTTagCompound compound = new NBTTagCompound();
		compound = this.te.writeToNBT(compound);
		this.time = compound.getInteger("time");
		this.maxTime = compound.getInteger("maxTime");
		Core.logger.info(compound);
		super.updateScreen();
	}

What's wrong?

Full code:

Block: *CLICK*

Tile Entity: *CLICK*

Container: *CLICK*

GUI: *CLICK*

jabelar · May 13, 2018

You didn't read my suggestions closely enough. Writing NBT is only really for server side and there is no syncing for that. You need to look at the TileEntity getUpdatePacket() and onDataPacket(). Some other methods that might be useful are getUpdateTag(), getTileData().

V0idWa1k3r · May 14, 2018

You can use the built-in gui sync methods in Container class: Container#addListener(IContainerListener listener) is for initial sync when the player opens the GUI, Container#detectAndSendChanges() is for periodic detection of changes and sending those changes to the client and Container#updateProgressBar(int id, int data) is for receiving updates on the client. You send updates with IContainerListener#sendWindowProperty. See ContainerFurnace or ContainerBrewingStand for examples.

This obviously only works for the GUIs. If you want the data for a progress bar in the world or for something else you will have to use packets as Draco said.

IvanSteklow · May 14, 2018

On 5/13/2018 at 5:15 PM, Draco18s said:

Packets.

So, I tried. Crash:

Spoiler


[18:43:07] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Preparing start region for level 0
[18:43:08] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Preparing spawn area: 3%
[18:43:09] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Preparing spawn area: 50%
[18:43:10] [Server thread/FATAL] [FML]: Fatal errors were detected during the transition from SERVER_ABOUT_TO_START to SERVER_STARTING. Loading cannot continue
[18:43:10] [Server thread/FATAL] [FML]: 
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

	| State    | ID        | Version      | Source                           | Signature |
	|:-------- |:--------- |:------------ |:-------------------------------- |:--------- |
	| UCHIJAAA | minecraft | 1.12.2       | minecraft.jar                    | None      |
	| UCHIJAAA | mcp       | 9.42         | minecraft.jar                    | None      |
	| UCHIJAAA | FML       | 8.0.99.99    | forgeSrc-1.12.2-14.23.3.2655.jar | None      |
	| UCHIJAAA | forge     | 14.23.3.2655 | forgeSrc-1.12.2-14.23.3.2655.jar | None      |
	| UCHIJAAA | isdev     | 2.1.0        | bin                              | None      |
	| UCHIJAAE | tf2mod    | 1.0.0        | bin                              | None      |

[18:43:10] [Server thread/FATAL] [FML]: The following problems were captured during this phase
[18:43:10] [Server thread/ERROR] [FML]: Caught exception from tf2mod (Team Fortress 2 Mod)
java.lang.RuntimeException: java.lang.InstantiationException: ru.ivansteklow.tf2mod.network.PacketMetalRefinery$PacketMetalRefineryHandler
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.instantiate(SimpleNetworkWrapper.java:170) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.registerMessage(SimpleNetworkWrapper.java:159) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at ru.ivansteklow.tf2mod.Core.serverStarting(Core.java:70) ~[bin/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:602) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[guava-21.0.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[guava-21.0.jar:?]
	at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:278) ~[LoadController.class:?]
	at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:256) [LoadController.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[guava-21.0.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[guava-21.0.jar:?]
	at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:148) [LoadController.class:?]
	at net.minecraftforge.fml.common.Loader.serverStarting(Loader.java:771) [Loader.class:?]
	at net.minecraftforge.fml.common.FMLCommonHandler.handleServerStarting(FMLCommonHandler.java:296) [FMLCommonHandler.class:?]
	at net.minecraft.server.integrated.IntegratedServer.init(IntegratedServer.java:162) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:550) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_161]
Caused by: java.lang.InstantiationException: ru.ivansteklow.tf2mod.network.PacketMetalRefinery$PacketMetalRefineryHandler
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_161]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.instantiate(SimpleNetworkWrapper.java:166) ~[SimpleNetworkWrapper.class:?]
	... 36 more
Caused by: java.lang.NoSuchMethodException: ru.ivansteklow.tf2mod.network.PacketMetalRefinery$PacketMetalRefineryHandler.<init>()
	at java.lang.Class.getConstructor0(Unknown Source) ~[?:1.8.0_161]
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_161]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.instantiate(SimpleNetworkWrapper.java:166) ~[SimpleNetworkWrapper.class:?]
	... 36 more
[18:43:10] [Server thread/ERROR] [FML]: A fatal exception occurred during the server starting event
net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Team Fortress 2 Mod (tf2mod)

Caused by: java.lang.RuntimeException: java.lang.InstantiationException: ru.ivansteklow.tf2mod.network.PacketMetalRefinery$PacketMetalRefineryHandler
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.instantiate(SimpleNetworkWrapper.java:170) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.registerMessage(SimpleNetworkWrapper.java:159) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at ru.ivansteklow.tf2mod.Core.serverStarting(Core.java:70) ~[bin/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:602) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[guava-21.0.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[guava-21.0.jar:?]
	at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:278) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:256) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[guava-21.0.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[guava-21.0.jar:?]
	at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:148) ~[LoadController.class:?]
	at net.minecraftforge.fml.common.Loader.serverStarting(Loader.java:771) [Loader.class:?]
	at net.minecraftforge.fml.common.FMLCommonHandler.handleServerStarting(FMLCommonHandler.java:296) [FMLCommonHandler.class:?]
	at net.minecraft.server.integrated.IntegratedServer.init(IntegratedServer.java:162) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:550) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_161]
Caused by: java.lang.InstantiationException: ru.ivansteklow.tf2mod.network.PacketMetalRefinery$PacketMetalRefineryHandler
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_161]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.instantiate(SimpleNetworkWrapper.java:166) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.registerMessage(SimpleNetworkWrapper.java:159) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at ru.ivansteklow.tf2mod.Core.serverStarting(Core.java:70) ~[bin/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:602) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[guava-21.0.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[guava-21.0.jar:?]
	at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:278) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:256) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[guava-21.0.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[guava-21.0.jar:?]
	at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:148) ~[LoadController.class:?]
	at net.minecraftforge.fml.common.Loader.serverStarting(Loader.java:771) ~[Loader.class:?]
	at net.minecraftforge.fml.common.FMLCommonHandler.handleServerStarting(FMLCommonHandler.java:296) ~[FMLCommonHandler.class:?]
	at net.minecraft.server.integrated.IntegratedServer.init(IntegratedServer.java:162) ~[IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:550) ~[MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) ~[?:1.8.0_161]
Caused by: java.lang.NoSuchMethodException: ru.ivansteklow.tf2mod.network.PacketMetalRefinery$PacketMetalRefineryHandler.<init>()
	at java.lang.Class.getConstructor0(Unknown Source) ~[?:1.8.0_161]
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_161]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.instantiate(SimpleNetworkWrapper.java:166) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.registerMessage(SimpleNetworkWrapper.java:159) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at ru.ivansteklow.tf2mod.Core.serverStarting(Core.java:70) ~[bin/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:602) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[guava-21.0.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[guava-21.0.jar:?]
	at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:278) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:256) ~[forgeSrc-1.12.2-14.23.3.2655.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[guava-21.0.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[guava-21.0.jar:?]
	at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:148) ~[LoadController.class:?]
	at net.minecraftforge.fml.common.Loader.serverStarting(Loader.java:771) ~[Loader.class:?]
	at net.minecraftforge.fml.common.FMLCommonHandler.handleServerStarting(FMLCommonHandler.java:296) ~[FMLCommonHandler.class:?]
	at net.minecraft.server.integrated.IntegratedServer.init(IntegratedServer.java:162) ~[IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:550) ~[MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) ~[?:1.8.0_161]
[18:43:10] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Stopping server
[18:43:10] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Saving players
[18:43:10] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Saving worlds
[18:43:10] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Saving chunks for level 'New World'/overworld
[18:43:10] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Saving chunks for level 'New World'/the_nether
[18:43:10] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Saving chunks for level 'New World'/the_end
[18:43:10] [Server thread/INFO] [FML]: Unloading dimension 0
[18:43:10] [Server thread/INFO] [FML]: Unloading dimension -1
[18:43:10] [Server thread/INFO] [FML]: Unloading dimension 1
[18:43:11] [Server thread/INFO] [FML]: Applying holder lookups
[18:43:11] [Server thread/INFO] [FML]: Holder lookups applied
[18:43:11] [Server thread/INFO] [FML]: The state engine was in incorrect state ERRORED and forced into state SERVER_STOPPED. Errors may have been discarded.
[18:43:11] [Server thread/INFO] [FML]: The state engine was in incorrect state ERRORED and forced into state AVAILABLE. Errors may have been discarded.

Packet Handler: *CLICK*

What's wrong. Yeah, I don't like packets and never work with it

Draco18s · May 14, 2018

The fuck is this for? You never set it to true.
https://github.com/IvanSteklow/TF2Mod/blob/master/src/main/java/ru/ivansteklow/tf2mod/network/PacketMetalRefinery.java#L18

Why is this empty?

https://github.com/IvanSteklow/TF2Mod/blob/master/src/main/java/ru/ivansteklow/tf2mod/network/PacketMetalRefinery.java#L33

This should be public static class, or in another file entirely.

https://github.com/IvanSteklow/TF2Mod/blob/master/src/main/java/ru/ivansteklow/tf2mod/network/PacketMetalRefinery.java#L47

As such, this will crash the server:

https://github.com/IvanSteklow/TF2Mod/blob/master/src/main/java/ru/ivansteklow/tf2mod/network/PacketMetalRefinery.java#L53

As to the crash you have, it's trying to find an init method or a constructor on your handler, I'm not entirely sure.

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[1.12.2] Data exchanging between Client and Server

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