[1.10.2] [SOLVED] Get all player username in the server with client command

SteveKunG · November 16, 2016

I have a problem when using /getplayerpos command in the server, it can't get all players name and make game crash.

package stevekung.mods.indicatorutils.command;

import java.util.List;

import javax.annotation.Nullable;

import net.minecraft.command.CommandBase;

import net.minecraft.command.CommandException;

import net.minecraft.command.ICommandSender;

import net.minecraft.command.WrongUsageException;

import net.minecraft.server.MinecraftServer;

import net.minecraft.util.math.BlockPos;

import stevekung.mods.indicatorutils.IndicatorUtils;

import stevekung.mods.indicatorutils.PlayerPositionHandler;

public class CommandGetPlayerPosition extends CommandBase

{

@Override

public int getRequiredPermissionLevel()

{

return 0;

}

@Override

public String getCommandUsage(ICommandSender sender)

{

return "/" + this.getCommandName();

}

@Override

public String getCommandName()

{

return "getplayerpos";

}

@Override

public void execute(MinecraftServer server, ICommandSender sender, String[] args) throws CommandException

{

if (args.length < 1)

{

throw new WrongUsageException("commands.getplayerpos.fail", new Object[] { this.getCommandUsage(sender) });

}

else

{

IndicatorUtils.NETWORK.sendToServer(new PlayerPositionHandler(args[0]));

}

@Override

public List<String> getTabCompletionOptions(MinecraftServer server, ICommandSender sender, String[] args, @Nullable BlockPos pos)

{

return CommandBase.getListOfStringsMatchingLastWord(args, server.getAllUsernames());

}

@Override

public boolean isUsernameIndex(String[] args, int index)

{

return index == 0;

}

Choonster · November 16, 2016

Always post the crash report and/or FML log (logs/fml-client-latest.log or logs/fml-server-latest.log) when asking for help with a crash.

It's not safe to use

MinecraftServer

in a client command, all interaction between the client and server must be handled through packets. Forge's documentation explains sides here and networking here.

Why is this even a client command? If you need data from the server and your mod is on the server, use a server command.

SteveKunG · November 16, 2016

My mod is in client side only. Because I only use in the realm server.

Crash report

---- Minecraft Crash Report ----

// Uh... Did I do that?

Time: 16/11/2559, 14:40 น.

Description: Updating screen events

java.lang.NullPointerException: Updating screen events

at stevekung.mods.indicatorutils.command.CommandGetPlayerPosition.getTabCompletionOptions(CommandGetPlayerPosition.java:58)

at net.minecraft.command.CommandHandler.getTabCompletionOptions(CommandHandler.java:195)

at stevekung.mods.indicatorutils.utils.ClientCommandHandlerIU.autoComplete(ClientCommandHandlerIU.java:101)

at net.minecraft.util.TabCompleter.requestCompletions(TabCompleter.java:70)

at net.minecraft.util.TabCompleter.complete(TabCompleter.java:52)

at net.minecraft.client.gui.GuiChat$ChatTabCompleter.complete(GuiChat.java:279)

at net.minecraft.client.gui.GuiChat.keyTyped(GuiChat.java:89)

at net.minecraft.client.gui.GuiScreen.handleKeyboardInput(GuiScreen.java:645)

at net.minecraft.client.gui.GuiScreen.handleInput(GuiScreen.java:593)

at net.minecraft.client.Minecraft.runTick(Minecraft.java:1797)

at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1118)

at net.minecraft.client.Minecraft.run(Minecraft.java:406)

at net.minecraft.client.main.Main.main(Main.java:118)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)

at GradleStart.main(GradleStart.java:26)

A detailed walkthrough of the error, its code path and all known details is as follows:

---------------------------------------------------------------------------------------

-- Head --

Thread: Client thread

Stacktrace: