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Registering a command throws AbstractMethodError exception


Alsan Ali
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When I'm trying to register my command, I get this:

[12:48:52] [Server thread/ERROR] [FML]: Caught exception from ebm_core (EBM Core)
java.lang.AbstractMethodError: null
	at net.minecraft.command.CommandBase.updateNamespacedAlias(CommandBase.java:1006) ~[bi.class:?]
	at org.spongepowered.common.command.MinecraftCommandWrapper.<init>(MinecraftCommandWrapper.java:89) ~[MinecraftCommandWrapper.class:1.12.2-2611-7.1.0-BETA-2946]
	at org.spongepowered.mod.command.ForgeMinecraftCommandWrapper.<init>(ForgeMinecraftCommandWrapper.java:43) ~[ForgeMinecraftCommandWrapper.class:1.12.2-2611-7.1.0-BETA-2946]
	at net.minecraft.command.ServerCommandManager.wrapCommand(SourceFile:1550) ~[dh.class:?]
	at net.minecraft.command.ServerCommandManager.func_71560_a(SourceFile:1102) ~[dh.class:?]
	at net.minecraftforge.fml.common.event.FMLServerStartingEvent.registerServerCommand(FMLServerStartingEvent.java:59) ~[FMLServerStartingEvent.class:?]
	at net.everybytematters.ebm_core.EBMCore.serverStarting(EBMCore.java:91) ~[EBMCore.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_152]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_152]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
	at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:600) ~[forge-1.12.2-14.23.2.2632-universal.jar:?]
	at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
	at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:278) ~[forge-1.12.2-14.23.2.2632-universal.jar:?]
	at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:256) ~[forge-1.12.2-14.23.2.2632-universal.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_152]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_152]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
	at net.minecraftforge.fml.common.LoadController.redirect$onPost$zza000(LoadController.java:560) [LoadController.class:?]
	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.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:306) [nz.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_152]
[12:48:52] [Server thread/ERROR] [FML]: A fatal exception occurred during the server starting event
net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from EBM Core (ebm_core)

Caused by: java.lang.AbstractMethodError
	at net.minecraft.command.CommandBase.updateNamespacedAlias(CommandBase.java:1006) ~[bi.class:?]
	at org.spongepowered.common.command.MinecraftCommandWrapper.<init>(MinecraftCommandWrapper.java:89) ~[MinecraftCommandWrapper.class:1.12.2-2611-7.1.0-BETA-2946]
	at org.spongepowered.mod.command.ForgeMinecraftCommandWrapper.<init>(ForgeMinecraftCommandWrapper.java:43) ~[ForgeMinecraftCommandWrapper.class:1.12.2-2611-7.1.0-BETA-2946]
	at net.minecraft.command.ServerCommandManager.wrapCommand(SourceFile:1550) ~[dh.class:?]
	at net.minecraft.command.ServerCommandManager.func_71560_a(SourceFile:1102) ~[dh.class:?]
	at net.minecraftforge.fml.common.event.FMLServerStartingEvent.registerServerCommand(FMLServerStartingEvent.java:59) ~[FMLServerStartingEvent.class:?]
	at net.everybytematters.ebm_core.EBMCore.serverStarting(EBMCore.java:91) ~[EBMCore.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_152]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_152]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
	at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:600) ~[forge-1.12.2-14.23.2.2632-universal.jar:?]
	at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
	at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:278) ~[forge-1.12.2-14.23.2.2632-universal.jar:?]
	at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:256) ~[forge-1.12.2-14.23.2.2632-universal.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_152]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_152]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
	at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
	at net.minecraftforge.fml.common.LoadController.redirect$onPost$zza000(LoadController.java:560) ~[LoadController.class:?]
	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.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:306) [nz.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_152]

 

Here's my command class:

public class CommandAuthenticate extends CommandBase {
    public HashMap<String, Integer> hashMap = new HashMap<String, Integer>();

    @Override
    public String getName() {
        return "authenticate";
    }

    @Override
    public boolean checkPermission(MinecraftServer server, ICommandSender sender) {
        // Check permission code
    }

    @Override
    public String getUsage(ICommandSender sender) {
        // Get usage code
    }

    @Override
    public List<String> getAliases() {
        // Alias code
    }

    @Override
    public void execute(MinecraftServer server, ICommandSender sender, String[] args) throws CommandException {
        // Execute code
    }

    @Override
    public List<String> getTabCompletions(MinecraftServer server, ICommandSender sender, String[] args, @Nullable BlockPos targetPos)
    {
        // Get tab completions code
    }

    @Override
    public boolean isUsernameIndex(String[] args, int index) {
        return false;
    }

    @Override
    public int compareTo(ICommand o) {
        return 0;
    }
}

 

I'm registering this command in:

@EventHandler
public void serverStarting(FMLServerStartingEvent event) {
    event.registerServerCommand(commandAuthenticate);
}

 

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Your command class should not even compile, if it is what you've posted.

11 minutes ago, Alsan Ali said:

    @Override
    public boolean isUsernameIndex(String[] args, int index) {
        return false;
    }

    @Override
    public int compareTo(ICommand o) {
        return 0;
    }

 

That said, this is just flat wrong.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

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