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[1.12.2]How to send command when player join a game?

mlgmxyysd

By mlgmxyysd
in Modder Support

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mlgmxyysd Tree Puncher

mlgmxyysd

Posted
Posted

I use  

Minecraft.getMinecraft().player.sendChatMessage("/login " + password);

then game throw a NullPointerException.

Context: 

package org.meowcat.autocommadner;
import net.minecraft.client.Minecraft;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.fml.common.FMLCommonHandler;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.common.gameevent.PlayerEvent;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import java.io.*;
import java.lang.reflect.Method;
import java.util.Properties;
public class JoinEvent {
	private Properties prop = new Properties();
	JoinEvent() {
		MinecraftForge.EVENT_BUS.register(this);
		FMLCommonHandler.instance().bus().register(this);
	}
	@SideOnly(Side.CLIENT)
	@SubscribeEvent
	public void PlayerJoinGame(PlayerEvent.PlayerLoggedInEvent event) throws IOException {
	    try{
	        Class mc = Class.forName(Minecraft.class.getName());
	        Method[] methods = mc.getMethods();
	        for (Method method : methods){
                Main.logger.info(method.getName());
            }
        } catch (ClassNotFoundException e ) {
            e.printStackTrace();
        }
		File file = new File("config/user.properties");
		if (!file.exists()) {
            Minecraft.getMinecraft().shutdown();
		}
        InputStream in = new BufferedInputStream(new FileInputStream("config/user.properties"));
        prop.load(in);
        String password = prop.getProperty("Password");
        String registered = prop.getProperty("IsRegistered");
        if (!registered.equals("true")) {
           Minecraft.getMinecraft().player.sendChatMessage("/register " + password + " " + password);
        } else {
           Minecraft.getMinecraft().player.sendChatMessage("/login " + password);
        }
	}
}

 

Cadiboo Reality Controller

Cadiboo

Posted
Posted (edited)

What exactly are you trying to do? From an end-user persective

Edited by Cadiboo

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Versions below 1.14.4 are no longer supported on this forum. Use the latest version to receive support.

When asking support remember to include all relevant log files (logs are found in .minecraft/logs/), code if applicable and screenshots if possible.

Only download mods from trusted sites like CurseForge (minecraft.curseforge.com). A list of bad sites can be found here, with more information available at stopmodreposts.org

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mlgmxyysd Tree Puncher

mlgmxyysd

Posted
  • Author
Posted
  On 12/27/2018 at 3:51 PM, diesieben07 said:

It might not be. Still, why? This usually means you are pirating the game.

 

You need to use ClientTickEvent, PlayedLoggedInEvent is server-side only. And that is not how @SideOnly works.

Expand  

The mod is a client mod,not a server mod.

mlgmxyysd Tree Puncher

mlgmxyysd

Posted
  • Author
Posted
  On 12/27/2018 at 3:51 PM, diesieben07 said:

It might not be. Still, why? This usually means you are pirating the game.

 

You need to use ClientTickEvent, PlayedLoggedInEvent is server-side only. And that is not how @SideOnly works.

Expand  

No,I bought Minecraft.

Cadiboo Reality Controller

Cadiboo

Posted
Posted

send your code and the error

About Me

  Reveal hidden contents

Versions below 1.14.4 are no longer supported on this forum. Use the latest version to receive support.

When asking support remember to include all relevant log files (logs are found in .minecraft/logs/), code if applicable and screenshots if possible.

Only download mods from trusted sites like CurseForge (minecraft.curseforge.com). A list of bad sites can be found here, with more information available at stopmodreposts.org

Edit your own signature at www.minecraftforge.net/forum/settings/signature/ (Make sure to check its compatibility with the Dark Theme)

mlgmxyysd Tree Puncher

mlgmxyysd

Posted
  • Author
Posted
  On 12/29/2018 at 2:04 PM, diesieben07 said:

The code above has not changed. No error was posted.

Expand  

It may cause by network problem. 

package org.meowcat.autocommadner;
import net.minecraft.client.Minecraft;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.fml.common.FMLCommonHandler;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.common.gameevent.TickEvent;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import java.io.*;
import java.lang.reflect.Method;
import java.util.Properties;
public class JoinEvent {
	private Properties prop = new Properties();
	JoinEvent() {
		MinecraftForge.EVENT_BUS.register(this);
		FMLCommonHandler.instance().bus().register(this);
	}
	@SideOnly(Side.CLIENT)
	@SubscribeEvent
	public void PlayerJoinGame(TickEvent.ClientTickEvent event) throws IOException {
	    try{
	        Class mc = Class.forName(Minecraft.class.getName());
	        Method[] methods = mc.getMethods();
	        for (Method method : methods){
                Main.logger.info(method.getName());
            }
        } catch (ClassNotFoundException e ) {
            e.printStackTrace();
        }
		File file = new File("config/user.properties");
		if (!file.exists()) {
            Minecraft.getMinecraft().shutdown();
		}
        InputStream in = new BufferedInputStream(new FileInputStream("config/user.properties"));
        prop.load(in);
        String password = prop.getProperty("Password");
        String registered = prop.getProperty("IsRegistered");
        if (!registered.equals("true")) {
           Minecraft.getMinecraft().player.sendChatMessage("/register " + password + " " + password);
        } else {
           Minecraft.getMinecraft().player.sendChatMessage("/login " + password);
        }
	}
}
java.lang.NullPointerException: Unexpected error
	at org.meowcat.autocommadner.JoinEvent.PlayerJoinGame(JoinEvent.java:42)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_18_JoinEvent_PlayerJoinGame_ClientTickEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
	at net.minecraftforge.fml.common.FMLCommonHandler.onPreClientTick(FMLCommonHandler.java:344)
	at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1708)
	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1098)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
	at net.minecraft.client.main.Main.main(SourceFile:123)
	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)

These are codes & errors

Cadiboo Reality Controller

Cadiboo

Posted
Posted (edited)

What are you trying to do with that code?

Edited by Cadiboo

About Me

  Reveal hidden contents

Versions below 1.14.4 are no longer supported on this forum. Use the latest version to receive support.

When asking support remember to include all relevant log files (logs are found in .minecraft/logs/), code if applicable and screenshots if possible.

Only download mods from trusted sites like CurseForge (minecraft.curseforge.com). A list of bad sites can be found here, with more information available at stopmodreposts.org

Edit your own signature at www.minecraftforge.net/forum/settings/signature/ (Make sure to check its compatibility with the Dark Theme)

mlgmxyysd Tree Puncher

mlgmxyysd

Posted
  • Author
Posted
  On 12/30/2018 at 7:49 PM, diesieben07 said:

Why on earth is this here? And blindly catching ClassNotFoundException and ignoring it is a bad idea. Handle exceptions properly.

 

Why on earth are you doing this every tick?! And registered should not be an option. Do not pirate the game.

 

You can only do this when the game is actually connected to a server. ClientTickEvent fires every client tick (duh), which is also during e.g. the main menu.

Expand  

Please don't get caught up in the secondary problem.

I only want to solve NullPointerException.

mlgmxyysd Tree Puncher

mlgmxyysd

Posted
  • Author
Posted
  On 12/31/2018 at 1:32 AM, diesieben07 said:

Pirating the game is not a secondary problem.

Please clearly state why that isRegistered option is present. If not I will assume it is for enabling pirated "accounts", in which case you will receive a ban.

Expand  

A bukkit plugin named Authme.

hiotewdew Creeper Killer

hiotewdew

Posted
Posted
  On 12/27/2018 at 3:51 PM, diesieben07 said:

It might not be. Still, why? This usually means you are pirating the game.

 

You need to use ClientTickEvent, PlayedLoggedInEvent is server-side only. And that is not how @SideOnly works.

Expand  

Not to go too off topic, but /login can be used on servers as a staff security measure as well as for cracked server auth. So, it's not always malicious. I once had to use it on my online mode server because we had this hacker who somehow figured out that commands could be run by staff before they were authenticated (I have no idea how, but I'm not lying, he'd done it) and so I had to add a login command for staff to counteract it.

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  • 3 weeks later...
mlgmxyysd Tree Puncher

mlgmxyysd

Posted
  • Author
Posted
  On 12/31/2018 at 3:20 PM, diesieben07 said:

I know, and this is the only reason this thread is not locked yet.

 

This explains nothing.

 

As far as the cause of your exception goes, I have already explained that above.

Expand  

OKAY, I does not use /login command, replace /login to /exp ok?

IS THIS OK? 

package org.meowcat.autocommadner;
import net.minecraft.client.Minecraft;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.fml.common.FMLCommonHandler;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.common.gameevent.TickEvent;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import java.io.*;
import java.lang.reflect.Method;
import java.util.Properties;
public class JoinEvent {
	private Properties prop = new Properties();
	JoinEvent() {
		MinecraftForge.EVENT_BUS.register(this);
		FMLCommonHandler.instance().bus().register(this);
	}
	@SideOnly(Side.CLIENT)
	@SubscribeEvent
	public void PlayerJoinGame(TickEvent.ClientTickEvent event) throws IOException {
	    try{
	        Class mc = Class.forName(Minecraft.class.getName());
	        Method[] methods = mc.getMethods();
	        for (Method method : methods){
                Main.logger.info(method.getName());
            }
        } catch (ClassNotFoundException e ) {
            e.printStackTrace();
        }
            Minecraft.getMinecraft().player.sendChatMessage("/exp");
	}
}
mlgmxyysd Tree Puncher

mlgmxyysd

Posted
  • Author
Posted
  On 12/31/2018 at 6:24 AM, hiotewdew said:

Not to go too off topic, but /login can be used on servers as a staff security measure as well as for cracked server auth. So, it's not always malicious. I once had to use it on my online mode server because we had this hacker who somehow figured out that commands could be run by staff before they were authenticated (I have no idea how, but I'm not lying, he'd done it) and so I had to add a login command for staff to counteract it.

Expand  

Yes, it is necessary to use unofficial login system in offline-mode server.

  • 2 years later...
coalbricks Tree Puncher

coalbricks

Posted
Posted
  On 1/16/2019 at 1:34 PM, diesieben07 said:

Why do you want an offline-mode server?

There is no reason except:

  1. To allow pirating the game, in which case that is not allowed.
  2. For a local network, in which case there i no need for whitelisting (you are already in a local network, noone can join from outside).

 

Expand  

This is an old discussion, but after reading through it seems you've been unfair to @mlgmxyysd and wrong to assume that there are only two reasons why someone might want an offline mode server. I can give you a couple more valid and legitimate reasons:

1. The local network point is valid, and yes nobody can join from outside, but he could be running his server on a university network in which case custom authentication would be useful. It could be that nobody could join from outside, but 30 thousand people could join from inside.

2. He could be running his server on a network where Minecraft's authentication endpoint is blocked.

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