[1.16.4] Edit Conversion Progress of Zombie Villager (Help with Java Reflection)

Luis_ST · January 19, 2021

I just want to overite the Conversion Progress of the Zombie Villager.

I use the PlayerInteractEvent.EntityInteractSpecific but the methode which i need is private so i use this to execute the Method:

but i got an error. And i dont know where the error is becaus its the first time i just use: "reflect"

package net.luis.cave.events.client.entity;

imports[..];

@Mod.EventBusSubscriber(modid=Cave.Mod_Id, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class OnEntityInteractSpecificEvent {

	@SubscribeEvent
	public static void EntityInteractSpecific(PlayerInteractEvent.EntityInteractSpecific event) {
		
		PlayerEntity player = event.getPlayer();
		LivingEntity target = (LivingEntity) event.getTarget();
		World world = event.getWorld();
		
		
		if (target instanceof ZombieVillagerEntity) {
			
			ZombieVillagerEntity zombieVillager = (ZombieVillagerEntity) target;
			
			if (player.getHeldItem(event.getHand()).getItem() == Items.GOLDEN_APPLE) {
				
				if (target.isPotionActive(Effects.WEAKNESS)) {
					
					event.setCanceled(true);
					
					if (!player.abilities.isCreativeMode) {
						
						player.getHeldItem(event.getHand()).shrink(1);
						
					}
					
					if (!world.isRemote) {
						
						executeMethod(zombieVillager, "startConverting", zombieVillager.getUniqueID(), 1);
						
					}
					
				}
				
			}
			
		}

	}
	
	public static Object executeMethod(Object obj, String methodName, Object... params) {
		
		int paramCount = params.length;
		Method method;
		Object requiredObj = null;
		Class<?>[] classArray = new Class<?>[paramCount];
		
		for (int i = 0; i < paramCount; i++) {
			
			classArray[i] = params[i].getClass();
			
		}
		
		try {
			
			method = obj.getClass().getDeclaredMethod(methodName, classArray);
			method.setAccessible(true);
			requiredObj = method.invoke(obj, params);
			
		} catch (Exception e) {
			
			e.printStackTrace();
			
		}

		return requiredObj;
		
	}

}

[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: java.lang.NoSuchMethodException: net.minecraft.entity.monster.ZombieVillagerEntity.startConverting(java.util.UUID,java.lang.Integer)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at java.base/java.lang.Class.getDeclaredMethod(Class.java:2553)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent.genericInvokeMethod(OnEntityInteractSpecificEvent.java:45)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent.EntityInteractSpecific(OnEntityInteractSpecificEvent.java:24)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraftforge.eventbus.ASMEventHandler_17_OnEntityInteractSpecificEvent_EntityInteractSpecific_EntityInteractSpecific.invoke(.dynamic)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:297)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraftforge.common.ForgeHooks.onInteractEntityAt(ForgeHooks.java:760)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraftforge.common.ForgeHooks.onInteractEntityAt(ForgeHooks.java:754)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraft.client.multiplayer.PlayerController.interactWithEntity(PlayerController.java:399)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraft.client.Minecraft.rightClickMouse(Minecraft.java:1390)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraft.client.Minecraft.processKeyBinds(Minecraft.java:1692)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1507)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:979)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraft.client.Minecraft.run(Minecraft.java:612)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraft.client.main.Main.main(Main.java:184)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:52)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at cpw.mods.modlauncher.Launcher.run(Launcher.java:82)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)
[20:37:57] [Render thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:genericInvokeMethod:51]: 	at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:105)

Edited January 19, 2021 by Luis_ST

Luis_ST · January 19, 2021

13 minutes ago, diesieben07 said:

Because you are using an Object[] for params, the 1 will get boxed from int to Integer. If you then call getClass on it you will get the Class for Integer. startConverting however takes an int.

okay thanks now i creat this:

but now how to set the int?

						Method startConverting = ObfuscationReflectionHelper.findMethod(
								zombieVillager.getClass(), "startConverting", 
								zombieVillager.getUniqueID().getClass(), /**int ?**/);

poopoodice · January 19, 2021

int.class

then Method#invoke to access it.

Luis_ST · January 19, 2021

13 minutes ago, diesieben07 said:

Don't use getClass. Use class literals.

13 minutes ago, poopoodice said:

int.class

then Method#invoke to access it.

so like this:

						Method startConverting = ObfuscationReflectionHelper.findMethod(
								zombieVillager.getClass(), "startConverting", 
								UUID.class, int.class);
						startConverting.setAccessible(true);
						try {
							
							startConverting.invoke(zombieVillager.getUniqueID(), 1);
							
						} catch (IllegalAccessException e) {
							
							e.printStackTrace();
							
						} catch (IllegalArgumentException e) {
							
							e.printStackTrace();
							
						} catch (InvocationTargetException e) {
							
							e.printStackTrace();
							
						}

Luis_ST · January 19, 2021

13 minutes ago, diesieben07 said:

You need to use the SRG name, your mod will not work outside the development environment.

i understand but what are SRG names?

13 minutes ago, diesieben07 said:

Do not call findMethod every time. Do it once and store it in a static final field.

13 minutes ago, diesieben07 said:

You do not need to call setAccessible when using ObfsucationReflectionHelper.

okay

13 minutes ago, diesieben07 said:

The UUID the method expects is supposed to be a player, not the zombie's UUID. You can use null if the conversion is not started by a player.

the conversion is start by a player so i use player.getUniqueID()

this is my code:

https://github.com/Luis-st/Forge-1.16.4-35.1.4-mdk/blob/main/forge-1.16.4-35.1.4-mdk/src/main/java/net/luis/cave/events/client/entity/OnEntityInteractSpecificEvent.java

Edited January 19, 2021 by Luis_ST
add code

Luis_ST · January 19, 2021

2 minutes ago, diesieben07 said:

you can use forge-bot on the Forge discord to find it. It's necessary for the code to work in the obfuscated environment.

is the rest of my code correct:

https://github.com/Luis-st/Forge-1.16.4-35.1.4-mdk/blob/main/forge-1.16.4-35.1.4-mdk/src/main/java/net/luis/cave/events/client/entity/OnEntityInteractSpecificEvent.java

and which is the comand for the bot? !sgr and then the name -> !sgr startConverting

Luis_ST · January 19, 2021

1 minute ago, diesieben07 said:

Use !commands to get a list of commands.

i just use this but i cant find a command with this name i try to get the command with !help <each Command>

Luis_ST · January 19, 2021

2 minutes ago, diesieben07 said:

mcpm / mcpf for methods / classes respectively.

when its correct its func_191991_a

Luis_ST · January 19, 2021

1 minute ago, diesieben07 said:

Does it work?

nop i got an new Error:

[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent.EntityInteractSpecific(OnEntityInteractSpecificEvent.java:51)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraftforge.eventbus.ASMEventHandler_16_OnEntityInteractSpecificEvent_EntityInteractSpecific_EntityInteractSpecific.invoke(.dynamic)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:297)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraftforge.common.ForgeHooks.onInteractEntityAt(ForgeHooks.java:760)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.network.play.ServerPlayNetHandler.processUseEntity(ServerPlayNetHandler.java:1246)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.network.play.client.CUseEntityPacket.processPacket(CUseEntityPacket.java:89)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.network.play.client.CUseEntityPacket.processPacket(CUseEntityPacket.java:15)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.network.PacketThreadUtil.lambda$checkThreadAndEnqueue$0(PacketThreadUtil.java:19)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.util.concurrent.TickDelayedTask.run(TickDelayedTask.java:20)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.util.concurrent.ThreadTaskExecutor.run(ThreadTaskExecutor.java:139)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.util.concurrent.RecursiveEventLoop.run(RecursiveEventLoop.java:22)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:758)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:159)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.util.concurrent.ThreadTaskExecutor.driveOne(ThreadTaskExecutor.java:109)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.server.MinecraftServer.driveOneInternal(MinecraftServer.java:741)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.server.MinecraftServer.driveOne(MinecraftServer.java:735)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.util.concurrent.ThreadTaskExecutor.driveUntil(ThreadTaskExecutor.java:122)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.server.MinecraftServer.runScheduledTasks(MinecraftServer.java:721)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:667)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at net.minecraft.server.MinecraftServer.lambda$startServer$0(MinecraftServer.java:233)
[10:25:09] [Server thread/INFO] [STDERR/]: [net.luis.cave.events.client.entity.OnEntityInteractSpecificEvent:EntityInteractSpecific:59]: 	at java.base/java.lang.Thread.run(Thread.java:832)

this is my code:

package net.luis.cave.events.client.entity;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.UUID;

import net.luis.cave.Cave;
import net.minecraft.entity.LivingEntity;
import net.minecraft.entity.monster.ZombieVillagerEntity;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.item.Items;
import net.minecraft.world.World;
import net.minecraftforge.event.entity.player.PlayerInteractEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.ObfuscationReflectionHelper;

@Mod.EventBusSubscriber(modid=Cave.Mod_Id, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class OnEntityInteractSpecificEvent {
	
	private static final Method startConverting = ObfuscationReflectionHelper.findMethod(ZombieVillagerEntity.class, "func_191991_a", UUID.class, int.class);
	
	@SubscribeEvent
	public static void EntityInteractSpecific(PlayerInteractEvent.EntityInteractSpecific event) {
		
		PlayerEntity player = event.getPlayer();
		LivingEntity target = (LivingEntity) event.getTarget();
		World world = event.getWorld();
		
		
		if (target instanceof ZombieVillagerEntity) {
			
			if (player.getHeldItem(event.getHand()).getItem() == Items.GOLDEN_APPLE) {
				
				if (!player.abilities.isCreativeMode) {
					
					player.getHeldItem(event.getHand()).shrink(1);
					
				}
				
				if (!world.isRemote) {
					
					try {
						
						startConverting.invoke(player.getUniqueID(), 1);
						
					} catch (IllegalAccessException e) {
						
						e.printStackTrace();
						
					} catch (IllegalArgumentException e) {
						
						e.printStackTrace();
						
					} catch (InvocationTargetException e) {
						
						e.printStackTrace();
						
					}
					
				}
				
			}
			
		}

	}

}

poopoodice · January 19, 2021

You did not pass the instance of the object (zombie).

Luis_ST · January 19, 2021

2 minutes ago, poopoodice said:

You did not pass the instance of the object (zombie).

but where i have to pass that

Luis_ST · January 19, 2021

14 minutes ago, diesieben07 said:

Read the documentation for invoke.

Thanks for your helping.

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[1.16.4] Edit Conversion Progress of Zombie Villager (Help with Java Reflection)

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