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I'm using the latest version of Forge and I get a crash when I try to run my mod outside of MCP. Here's the crash log:

---- Minecraft Crash Report ----
// I let you down. Sorry 

Time: 9/9/12 4:06 PM
Description: Failed to start game

cpw.mods.fml.common.LoaderException: java.lang.reflect.InvocationTargetException
        at cpw.mods.fml.common.LoadController.transition(LoadController.java:102)
        at cpw.mods.fml.common.Loader.initializeMods(Loader.java:625)
        at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:174)
        at net.minecraft.client.Minecraft.a(Minecraft.java:450)
        at net.minecraft.client.Minecraft.run(Minecraft.java:737)
        at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:371)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
        at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
        at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
        at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
        at com.google.common.eventbus.EventBus.post(EventBus.java:268)
        at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:124)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
        at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
        at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
        at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
        at com.google.common.eventbus.EventBus.post(EventBus.java:268)
        at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:81)
        at cpw.mods.fml.common.Loader.initializeMods(Loader.java:624)
        ... 4 more
Caused by: java.lang.NoClassDefFoundError: robocraft/common/robots/android/EntityAndroidRobot
        at robocraft.common.RoboCraft.load(RoboCraft.java:86)
        ... 30 more
Caused by: java.lang.ClassNotFoundException: robocraft.common.robots.android.EntityAndroidRobot
        at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:100)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        ... 31 more
Caused by: java.lang.ClassFormatError: Duplicate method name&signature in class file robocraft/common/robots/android/EntityAndroidRobot
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
        at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:94)
        ... 33 more

Relevant Details:
- Minecraft Version: 1.3.2
- Operating System: Mac OS X (i386) version 10.6.8
- Java Version: 1.6.0_22, Apple Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Apple Inc.
- Memory: 510316592 bytes (486 MB) / 550305792 bytes (524 MB) up to 1070399488 bytes (1020 MB)
- JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
- FML: FML v3.0.165.344 Minecraft Forge 4.0.0.241 3 mods loaded, 3 mods active
        FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized
        Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized
        ellipsis_RoboCraft [RoboCraft] (robocraft.zip) Unloaded->Constructed->Pre-initialized->Errored
- LWJGL: 2.4.2
- OpenGL: ATI Radeon HD 2400 XT OpenGL Engine GL version 2.1 ATI-1.6.36, ATI Technologies Inc.
- Is Modded: Definitely; 'forge,fml'
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)

and here's the EntityAndroidRobot class:

package robocraft.common.robots.android;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import net.minecraft.src.DamageSource;
import net.minecraft.src.Entity;
import net.minecraft.src.EntityItem;
import net.minecraft.src.EntityLightningBolt;
import net.minecraft.src.EntityLiving;
import net.minecraft.src.EntityPlayer;
import net.minecraft.src.IInventory;
import net.minecraft.src.ItemStack;
import net.minecraft.src.NBTTagCompound;
import net.minecraft.src.NBTTagList;
import net.minecraft.src.PotionEffect;
import net.minecraft.src.Vec3;
import net.minecraft.src.World;
import robocraft.common.InventoryRobot;
import robocraft.common.RoboCraft;
import robocraft.common.ai.IRobotController;
import robocraft.common.ai.IRobotControllerItem;
import robocraft.common.ai.pathing.DynamicPathFinder;
import robocraft.common.motion.IMotionModule;
import robocraft.common.motion.IMotionModuleItem;
import robocraft.common.power.IPowerCellItem;
import robocraft.common.power.IPowerSupplier;
import robocraft.common.power.IPowerTransfer;
import robocraft.common.power.IPowerTransferItem;
import robocraft.common.sensors.IRobotSensor;
import robocraft.common.sensors.IRobotSensorItem;
import robocraft.common.tools.IRobotManipulator;
import robocraft.common.tools.IRobotManipulatorItem;
import robocraft.common.upgrades.IRobotUpgrade;
import robocraft.common.upgrades.IRobotUpgradeItem;
import robocraft.util.NBTUtilities;
import cpw.mods.fml.common.Side;
import cpw.mods.fml.common.asm.SideOnly;

public class EntityAndroidRobot extends EntityRobot implements IInventory {
// Item interfaces
private IRobotController controller;
private IRobotSensor sensor;
private IPowerTransfer transfer;
private IMotionModule motion;
private IPowerSupplier battery;
private InventoryRobot inventory;
private IRobotManipulator leftManip, rightManip;
private IRobotUpgrade modules[] = new IRobotUpgrade[6];

// Stacks for the items
private ItemStack controllerStack, sensorStack, manipLeft, manipRight; // Slots
																		// 0-3
private ItemStack powerStack, motionStack, transferStack; // Slots 4-6
private ItemStack upgrades[] = new ItemStack[6];

// Persistant state

// State
private boolean suspended;
private int ticksSinceSync;
private DynamicPathFinder dynPather;

public EntityAndroidRobot(World w) {
	super(w);
	texture = "/robocraft/mob/AndroidRobot.png";

	controller = null;
	sensor = null;
	transfer = null;
	motion = null;
	battery = null;
	leftManip = rightManip = null;
	inventory = new InventoryRobot(this); // The size of a large chest

	controllerStack = sensorStack = manipLeft = manipRight = powerStack = null;
	motionStack = transferStack = null;
	upgrades[0] = upgrades[1] = upgrades[2] = upgrades[3] = upgrades[4] = upgrades[5] = null;

	suspended = false;
	ticksSinceSync = 0;
	this.height = 2.0f;
	this.entityType = "humanoid";

	dynPather = new DynamicPathFinder(worldObj, this, false, false);

	getNavigator().setAvoidSun(false);
	getNavigator().setAvoidsWater(false);
	getNavigator().setBreakDoors(false);
	getNavigator().setCanSwim(true);
	getNavigator().setSpeed(20.0f);
	getNavigator().setEnterDoors(true);
}

@Override
protected void entityInit() {
	super.entityInit();
	dataWatcher.addObject(16, Byte.valueOf((byte) 0));
	dataWatcher.addObject(17, "");
}

private boolean consumeEnergy(float e) {
	if (battery == null)
		return false;
	return (battery.removeEnergy(e) == e);
}

@Override
public void onEntityUpdate() {
	super.onEntityUpdate();

	// Update energy transfer system
	if (transfer != null && battery != null)
		transfer.updateEnergyTransfer(battery, this);

	// Don't run any motion or AI if we're suspended or our battery is dead
	if (battery == null || battery.getEnergy() == 0.0f
			|| (dataWatcher.getWatchableObjectByte(16) == 1)) {
		if (battery != null) {
			battery.tick();
			battery.removeEnergy(0.01f);
		}
		stopMoving();
		this.isJumping = false;
		return;
	}
	battery.tick();
	battery.removeEnergy(0.5f);

	// Update AI module
	if (controller != null) {
		controller.update(this);
		battery.removeEnergy(controller.energyUsageThisTick());
	}

	// Iterate through upgrades
	for (int i = 0; i < 6; i++)
		if (modules[i] != null) {
			modules[i].update(this);
		}
}

@Override
public void onLivingUpdate() {
	super.onLivingUpdate();

	if(isDead) return;

	// Update the important AI stuff
        this.worldObj.theProfiler.startSection("navigation");
        dynPather.update();
        this.worldObj.theProfiler.endSection();
        this.worldObj.theProfiler.startSection("controls");
        this.worldObj.theProfiler.startSection("move");
        getMoveHelper().onUpdateMoveHelper();
        this.worldObj.theProfiler.endStartSection("look");
        getLookHelper().onUpdateLook();
        this.worldObj.theProfiler.endStartSection("jump");
        getJumpHelper().doJump();
        this.worldObj.theProfiler.endSection();
        this.worldObj.theProfiler.endSection();

	// Check collision with items
	List var3 = this.worldObj.getEntitiesWithinAABBExcludingEntity(this,
			this.boundingBox.expand(1.0D, 0.0D, 1.0D));

	if (var3 != null) {
		Iterator var4 = var3.iterator();
		while (var4.hasNext()) {
			Entity var5 = (Entity) var4.next();
			if (!var5.isDead && (var5 instanceof EntityItem)) {
				// Pickup the item
				EntityItem i = (EntityItem) var5;
				if (this.inventory.addItemStackToInventory(i.item)) {
					this.worldObj
							.playSoundAtEntity(
									this,
									"random.pop",
									0.2F,
									((this.rand.nextFloat() - this.rand
											.nextFloat()) * 0.7F + 1.0F) * 2.0F);
					if (i.item.stackSize <= 0)
						i.setDead();
				}
			}
		}
	}
}

@Override
public void updateEntityActionState() {
	// We override this so the robot doesn't turn towards players
}

@Override
public boolean interact(EntityPlayer par1EntityPlayer) {
	if (par1EntityPlayer == null || worldObj == null)
		return false;
	String owner = getOwner();
	if (owner != "" && par1EntityPlayer.username != owner
			&& !RoboCraft.debugging)
		return false;
	par1EntityPlayer.openGui(RoboCraft.instance, 40, worldObj, entityId, 0, 0);
	return true;
}

@Override
public void onStruckByLightning(EntityLightningBolt par1EntityLightningBolt) {
	if (battery != null) {
		float r = battery.addEnergy(1000);
		if (r > 0)
			this.worldObj.createExplosion(this, this.posX, this.posY,
					this.posZ, r / 100);
	}
}

@Override
public void readEntityFromNBT(NBTTagCompound var1) {
	super.readEntityFromNBT(var1);

	// Load inventory info
	NBTUtilities.loadInventory(var1.getTagList("Items"), this);
	inventory.readFromNBT(var1.getTagList("ChestItems"));

	// Construct modules from our inventory
	if (controllerStack != null
			&& (controllerStack.getItem() instanceof IRobotControllerItem)) {
		controller = ((IRobotControllerItem) (controllerStack.getItem()))
				.getControllerInstance(controllerStack);
		controller.initController();
	}
	if (sensorStack != null
			&& (sensorStack.getItem() instanceof IRobotSensorItem))
		sensor = ((IRobotSensorItem) (sensorStack.getItem()))
				.getSensorInstance(sensorStack);
	if (transferStack != null
			&& (transferStack.getItem() instanceof IPowerTransferItem))
		transfer = ((IPowerTransferItem) (transferStack.getItem()))
				.getTransferInstance(transferStack);
	if (motionStack != null
			&& (motionStack.getItem() instanceof IMotionModuleItem))
		motion = ((IMotionModuleItem) (motionStack.getItem()))
				.getModuleInstance(motionStack);
	if (powerStack != null
			&& (powerStack.getItem() instanceof IPowerCellItem))
		battery = ((IPowerCellItem) (powerStack.getItem()))
				.getPowerSupplierInstance(powerStack);
	if (manipLeft != null
			&& (manipLeft.getItem() instanceof IRobotManipulatorItem))
		leftManip = ((IRobotManipulatorItem) (manipLeft.getItem()))
				.getManipulatorInstance(manipLeft);
	if (manipRight != null
			&& (manipRight.getItem() instanceof IRobotManipulatorItem))
		rightManip = ((IRobotManipulatorItem) (manipRight.getItem()))
				.getManipulatorInstance(manipRight);
	for (int i = 0; i < 6; i++)
		if (upgrades[i] != null
				&& (upgrades[i].getItem() instanceof IRobotUpgradeItem))
			modules[i] = ((IRobotUpgradeItem) (upgrades[i].getItem()))
					.getUpgradeInstance(upgrades[i]);

	// Load the owner
	setOwner(var1.getString("Owner"));
}

@Override
public void writeEntityToNBT(NBTTagCompound var1) {
	super.writeEntityToNBT(var1);

	// Make sure all our modules save their states
	if (controller != null)
		controller.forceSave();
	if (sensor != null)
		sensor.forceSave();
	if (transfer != null)
		transfer.forceSave();
	if (motion != null)
		motion.forceSave();
	if (battery != null)
		battery.forceSave();
	if (leftManip != null)
		leftManip.forceSave();
	if (rightManip != null)
		rightManip.forceSave();
	for (int i = 0; i < 6; i++)
		if (modules[i] != null)
			modules[i].forceSave();

	var1.setTag("Items", NBTUtilities.saveInventory(this));
	var1.setTag("ChestItems", inventory.writeToNBT(new NBTTagList()));
	var1.setString("Owner", getOwner());
}

@Override
public int getMaxHealth() {
	return 1;
}

@Override
public boolean attackEntityFrom(DamageSource par1DamageSource, int par2) {
	if (!this.worldObj.isRemote) {
		if (par1DamageSource == DamageSource.inWall)
			return false;
		if (par1DamageSource == DamageSource.starve)
			return false;
		return super.attackEntityFrom(par1DamageSource, par2);
	}
	return false;
}

@Override
protected int applyArmorCalculations(DamageSource par1DamageSource, int par2) {
	return super.applyArmorCalculations(par1DamageSource, par2);
}

@Override
public void onDeath(DamageSource par1DamageSource) {
	System.out.println("On Death on " + ((worldObj.isRemote) ? "Remote" : "Local"));
	// Drop upgrades
	if (controllerStack != null) {
		controller.deinitController();
		this.entityDropItem(controllerStack, 0.2f);
	}
	if (sensorStack != null) {
		this.entityDropItem(sensorStack, 0.2f);
	}
	if (manipLeft != null) {
		this.entityDropItem(manipLeft, 0.2f);
	}
	if (manipRight != null) {
		this.entityDropItem(manipRight, 0.2f);
	}
	if (powerStack != null && !battery.getItem().isVolatile()) {
		this.entityDropItem(powerStack, 0.2f);
	}
	if (motionStack != null) {
		this.entityDropItem(motionStack, 0.2f);
	}
	if (transferStack != null) {
		this.entityDropItem(transferStack, 0.2f);
	}
	for (int i = 0; i < 6; i++)
		if (upgrades[i] != null)
			this.entityDropItem(upgrades[i], 0.2f);

	// Drop items from inventory
	inventory.dropAllItems();

	if (battery != null) {
		if (battery.getItem().isVolatile())
			this.worldObj.createExplosion(this, this.posX, this.posY,
					this.posZ, battery.getEnergy() / 10000);
	}
}

@Override
public boolean canBreatheUnderwater() {
	return true;
}

@Override
protected boolean canDespawn() {
	return false;
}

@Override
@SideOnly(Side.CLIENT)
public ItemStack getHeldItem() {
	return super.getHeldItem();
}

@Override
public boolean isPotionApplicable(PotionEffect par1PotionEffect) {
	return false;
}

@Override
public int getSizeInventory() {
	return 13;
}

@Override
public ItemStack getStackInSlot(int var1) {
	if (var1 <= 6) {
		switch (var1) {
		case 0:
			return controllerStack;
		case 1:
			return sensorStack;
		case 2:
			return manipLeft;
		case 3:
			return manipRight;
		case 4:
			return powerStack;
		case 5:
			return motionStack;
		case 6:
			return transferStack;
		}
	} else {
		return upgrades[var1 - 7];
	}
	return null;
}

@Override
public ItemStack decrStackSize(int var1, int var2) {
	System.out.println("decrStackSize on " + ((worldObj.isRemote) ? "Remote" : "Local"));
	if (getStackInSlot(var1) != null) {
		if (var1 <= 6) {
			// We had a module removed
		} else {
			if (modules[var1 - 7] != null) {
				modules[var1 - 7].deinitModule(this);
				modules[var1 - 7] = null;
			}
		}
		if (getStackInSlot(var1).stackSize <= var2) {
			ItemStack s = getStackInSlot(var1);
			setInventorySlotContents(var1, null);
			onInventoryChanged();
			return s;
		}
		ItemStack s1 = getStackInSlot(var1).splitStack(var2);
		if (getStackInSlot(var1).stackSize == 0)
			setInventorySlotContents(var1, null);
		onInventoryChanged();
		return s1;
	} else {
		return null;
	}
}

@Override
public ItemStack getStackInSlotOnClosing(int var1) {
	return getStackInSlot(var1);
}

@Override
public void setInventorySlotContents(int var1, ItemStack var2) {
	if (var1 <= 6) {
		switch (var1) {
		case 0:
			controllerStack = var2;
			if (var2 != null) {
				controller = ((IRobotControllerItem) var2.getItem())
						.getControllerInstance(var2);
				controller.initController();
			} else if(controller != null) {
				controller.deinitController();
				controller = null;
			}
			break;
		case 1:
			sensorStack = var2;
			if (var2 != null)
				sensor = ((IRobotSensorItem) var2.getItem())
						.getSensorInstance(var2);
			else
				sensor = null;
			break;
		case 2:
			manipLeft = var2;
			if (var2 != null)
				leftManip = ((IRobotManipulatorItem) var2.getItem())
						.getManipulatorInstance(var2);
			else
				leftManip = null;
			break;
		case 3:
			manipRight = var2;
			if (var2 != null)
				rightManip = ((IRobotManipulatorItem) var2.getItem())
						.getManipulatorInstance(var2);
			else
				rightManip = null;
			break;
		case 4:
			powerStack = var2;
			if (var2 != null)
				battery = ((IPowerCellItem) var2.getItem())
						.getPowerSupplierInstance(var2);
			else
				battery = null;
			break;
		case 5:
			motionStack = var2;
			if (var2 != null)
				motion = ((IMotionModuleItem) var2.getItem())
						.getModuleInstance(var2);
			else
				motion = null;
			break;
		case 6:
			transferStack = var2;
			if (var2 != null)
				transfer = ((IPowerTransferItem) var2.getItem())
						.getTransferInstance(var2);
			else
				transfer = null;
			break;
		}
	} else {
		upgrades[var1 - 7] = var2;
		if (var2 != null) {
			modules[var1 - 7] = ((IRobotUpgradeItem) (var2.getItem()))
					.getUpgradeInstance(var2);
			modules[var1 - 7].initModule(this);
		} else if(modules[var1 - 7] != null){
			modules[var1-7].deinitModule(this);
			modules[var1-7] = null;
		}
	}
	if (var2 != null && var2.stackSize > getInventoryStackLimit()) {
		var2.stackSize = getInventoryStackLimit();
	}
	onInventoryChanged();
}

@Override
public String getInvName() {
	return "Android";
}

@Override
public int getInventoryStackLimit() {
	return 1;
}

@Override
public void onInventoryChanged() {
}

@Override
public boolean isUseableByPlayer(EntityPlayer var1) {
	if (worldObj == null)
		return true;
	return var1.getDistanceSq((double) posX + 0.5d, (double) posY + 0.5d,
			(double) posZ + 0.5d) <= 64d;
}

@Override
public void openChest() {
	if (worldObj == null)
		return;
	if(!worldObj.isRemote) dataWatcher.updateObject(16, Byte.valueOf((byte) 1));
}

@Override
public void closeChest() {
	suspended = false;
	if(!worldObj.isRemote) dataWatcher.updateObject(16, Byte.valueOf((byte) 0));
}

@Override
public void lookAt(int x, int y, int z) {
	// Last two are the pitch and yaw velocity
	getLookHelper().setLookPosition(x, y, z, 5, 5);
}

@Override
public void moveTo(int x, int y, int z) {
	// Last one is speed
	dynPather.setTarget(x, y, z);
}

@Override
public boolean isMoving() {
	return dynPather.isMoving();
}

@Override
public void stopMoving() {
	Vec3 lv = getLookVec();
	getLookHelper().setLookPosition(lv.xCoord, lv.yCoord, lv.zCoord, 0, 0);
	getMoveHelper().setMoveTo(this.posX, this.posY, this.posZ, 0);
	dynPather.abort();
}

@Override
public void doJump() {
	getJumpHelper().setJumping();
}

@Override
public void writeRobotState(DataOutputStream s) throws IOException {
}

@Override
public void readRobotState(DataInputStream s) throws IOException {
}

@Override
public int getEntityID() {
	return entityId;
}

@Override
public EntityLiving getEntity() {
	return this;
}

public String getOwner() {
	return dataWatcher.getWatchableObjectString(17);
}

public void setOwner(String s) {
	if(!worldObj.isRemote) dataWatcher.updateObject(17, s);
}

@Override
public IRobotController getController() {
	return controller;
}

@Override
public IInventory getInventory() {
	return inventory;
}

@Override
public IRobotSensor getSensor() {
	return sensor;
}

@Override
public void transmitAIState(DataOutputStream s) {
	// TODO Auto-generated method stub

}

@Override
public void decodeAIState(DataInputStream s) {
	// TODO Auto-generated method stub

}

public DynamicPathFinder getPathFinder() {
	return dynPather;
}
}

 

I really can't seem to figure this out. Does anyone have any ideas?

Posted

Im gunna have to say that its cuz you're useing IInventory, which is typically reserved for Blocks/TileEntities.

Not Entities.

I do Forge for free, however the servers to run it arn't free, so anything is appreciated.
Consider supporting the team on Patreon

Posted

Look at my Particle Decoration Source here: https://github.com/SanAndreasP/Particle-Decoration-Mod

 

I'm using an extra class for the inventory and make an instance field of the inventory in the entity.

Don't ask for support per PM! They'll get ignored! | If a post helped you, click the "Thank You" button at the top right corner of said post! |

mah twitter

This thread makes me sad because people just post copy-paste-ready code when it's obvious that the OP has little to no programming experience. This is not how learning works.

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    • Version 1.19 - Forge 41.0.63 I want to create a wolf entity that I can ride, so far it seems to be working, but the problem is that when I get on the wolf, I can’t control it. I then discovered that the issue is that the server doesn’t detect that I’m riding the wolf, so I’m struggling with synchronization. However, it seems to not be working properly. As I understand it, the server receives the packet but doesn’t register it correctly. I’m a bit new to Java, and I’ll try to provide all the relevant code and prints *The comments and prints are translated by chatgpt since they were originally in Spanish* Thank you very much in advance No player is mounted, or the passenger is not a player. No player is mounted, or the passenger is not a player. No player is mounted, or the passenger is not a player. No player is mounted, or the passenger is not a player. No player is mounted, or the passenger is not a player. MountableWolfEntity package com.vals.valscraft.entity; import com.vals.valscraft.network.MountSyncPacket; import com.vals.valscraft.network.NetworkHandler; import net.minecraft.client.Minecraft; import net.minecraft.network.syncher.EntityDataAccessor; import net.minecraft.network.syncher.EntityDataSerializers; import net.minecraft.network.syncher.SynchedEntityData; import net.minecraft.server.MinecraftServer; import net.minecraft.server.level.ServerPlayer; import net.minecraft.world.entity.EntityType; import net.minecraft.world.entity.Mob; import net.minecraft.world.entity.ai.attributes.AttributeSupplier; import net.minecraft.world.entity.ai.attributes.Attributes; import net.minecraft.world.entity.animal.Wolf; import net.minecraft.world.entity.player.Player; import net.minecraft.world.entity.Entity; import net.minecraft.world.InteractionHand; import net.minecraft.world.InteractionResult; import net.minecraft.world.item.ItemStack; import net.minecraft.world.item.Items; import net.minecraft.world.level.Level; import net.minecraft.world.phys.Vec3; import net.minecraftforge.event.TickEvent; import net.minecraftforge.eventbus.api.SubscribeEvent; import net.minecraftforge.network.PacketDistributor; public class MountableWolfEntity extends Wolf { private boolean hasSaddle; private static final EntityDataAccessor<Byte> DATA_ID_FLAGS = SynchedEntityData.defineId(MountableWolfEntity.class, EntityDataSerializers.BYTE); public MountableWolfEntity(EntityType<? extends Wolf> type, Level level) { super(type, level); this.hasSaddle = false; } @Override protected void defineSynchedData() { super.defineSynchedData(); this.entityData.define(DATA_ID_FLAGS, (byte)0); } public static AttributeSupplier.Builder createAttributes() { return Wolf.createAttributes() .add(Attributes.MAX_HEALTH, 20.0) .add(Attributes.MOVEMENT_SPEED, 0.3); } @Override public InteractionResult mobInteract(Player player, InteractionHand hand) { ItemStack itemstack = player.getItemInHand(hand); if (itemstack.getItem() == Items.SADDLE && !this.hasSaddle()) { if (!player.isCreative()) { itemstack.shrink(1); } this.setSaddle(true); return InteractionResult.SUCCESS; } else if (!level.isClientSide && this.hasSaddle()) { player.startRiding(this); MountSyncPacket packet = new MountSyncPacket(true); // 'true' means the player is mounted NetworkHandler.CHANNEL.sendToServer(packet); // Ensure the server handles the packet return InteractionResult.SUCCESS; } return InteractionResult.PASS; } @Override public void travel(Vec3 travelVector) { if (this.isVehicle() && this.getControllingPassenger() instanceof Player) { System.out.println("The wolf has a passenger."); System.out.println("The passenger is a player."); Player player = (Player) this.getControllingPassenger(); // Ensure the player is the controller this.setYRot(player.getYRot()); this.yRotO = this.getYRot(); this.setXRot(player.getXRot() * 0.5F); this.setRot(this.getYRot(), this.getXRot()); this.yBodyRot = this.getYRot(); this.yHeadRot = this.yBodyRot; float forward = player.zza; float strafe = player.xxa; if (forward <= 0.0F) { forward *= 0.25F; } this.flyingSpeed = this.getSpeed() * 0.1F; this.setSpeed((float) this.getAttributeValue(Attributes.MOVEMENT_SPEED) * 1.5F); this.setDeltaMovement(new Vec3(strafe, travelVector.y, forward).scale(this.getSpeed())); this.calculateEntityAnimation(this, false); } else { // The wolf does not have a passenger or the passenger is not a player System.out.println("No player is mounted, or the passenger is not a player."); super.travel(travelVector); } } public boolean hasSaddle() { return this.hasSaddle; } public void setSaddle(boolean hasSaddle) { this.hasSaddle = hasSaddle; } @Override protected void dropEquipment() { super.dropEquipment(); if (this.hasSaddle()) { this.spawnAtLocation(Items.SADDLE); this.setSaddle(false); } } @SubscribeEvent public static void onServerTick(TickEvent.ServerTickEvent event) { if (event.phase == TickEvent.Phase.START) { MinecraftServer server = net.minecraftforge.server.ServerLifecycleHooks.getCurrentServer(); if (server != null) { for (ServerPlayer player : server.getPlayerList().getPlayers()) { if (player.isPassenger() && player.getVehicle() instanceof MountableWolfEntity) { MountableWolfEntity wolf = (MountableWolfEntity) player.getVehicle(); System.out.println("Tick: " + player.getName().getString() + " is correctly mounted on " + wolf); } } } } } private boolean lastMountedState = false; @Override public void tick() { super.tick(); if (!this.level.isClientSide) { // Only on the server boolean isMounted = this.isVehicle() && this.getControllingPassenger() instanceof Player; // Only print if the state changed if (isMounted != lastMountedState) { if (isMounted) { Player player = (Player) this.getControllingPassenger(); // Verify the passenger is a player System.out.println("Server: Player " + player.getName().getString() + " is now mounted."); } else { System.out.println("Server: The wolf no longer has a passenger."); } lastMountedState = isMounted; } } } @Override public void addPassenger(Entity passenger) { super.addPassenger(passenger); if (passenger instanceof Player) { Player player = (Player) passenger; if (!this.level.isClientSide && player instanceof ServerPlayer) { // Send the packet to the server to indicate the player is mounted NetworkHandler.CHANNEL.send(PacketDistributor.PLAYER.with(() -> (ServerPlayer) player), new MountSyncPacket(true)); } } } @Override public void removePassenger(Entity passenger) { super.removePassenger(passenger); if (passenger instanceof Player) { Player player = (Player) passenger; if (!this.level.isClientSide && player instanceof ServerPlayer) { // Send the packet to the server to indicate the player is no longer mounted NetworkHandler.CHANNEL.send(PacketDistributor.PLAYER.with(() -> (ServerPlayer) player), new MountSyncPacket(false)); } } } @Override public boolean isControlledByLocalInstance() { Entity entity = this.getControllingPassenger(); return entity instanceof Player; } @Override public void positionRider(Entity passenger) { if (this.hasPassenger(passenger)) { double xOffset = Math.cos(Math.toRadians(this.getYRot() + 90)) * 0.4; double zOffset = Math.sin(Math.toRadians(this.getYRot() + 90)) * 0.4; passenger.setPos(this.getX() + xOffset, this.getY() + this.getPassengersRidingOffset() + passenger.getMyRidingOffset(), this.getZ() + zOffset); } } } MountSyncPacket package com.vals.valscraft.network; import com.vals.valscraft.entity.MountableWolfEntity; import net.minecraft.network.FriendlyByteBuf; import net.minecraft.server.level.ServerLevel; import net.minecraft.server.level.ServerPlayer; import net.minecraft.world.entity.Entity; import net.minecraft.world.entity.player.Player; import net.minecraftforge.network.NetworkEvent; import java.util.function.Supplier; public class MountSyncPacket { private final boolean isMounted; public MountSyncPacket(boolean isMounted) { this.isMounted = isMounted; } public void encode(FriendlyByteBuf buffer) { buffer.writeBoolean(isMounted); } public static MountSyncPacket decode(FriendlyByteBuf buffer) { return new MountSyncPacket(buffer.readBoolean()); } public void handle(NetworkEvent.Context context) { context.enqueueWork(() -> { ServerPlayer player = context.getSender(); // Get the player from the context if (player != null) { // Verifies if the player has dismounted if (!isMounted) { Entity vehicle = player.getVehicle(); if (vehicle instanceof MountableWolfEntity wolf) { // Logic to remove the player as a passenger wolf.removePassenger(player); System.out.println("Server: Player " + player.getName().getString() + " is no longer mounted."); } } } }); context.setPacketHandled(true); // Marks the packet as handled } } networkHandler package com.vals.valscraft.network; import com.vals.valscraft.valscraft; import net.minecraft.resources.ResourceLocation; import net.minecraftforge.network.NetworkRegistry; import net.minecraftforge.network.simple.SimpleChannel; import net.minecraftforge.network.NetworkEvent; import java.util.function.Supplier; public class NetworkHandler { private static final String PROTOCOL_VERSION = "1"; public static final SimpleChannel CHANNEL = NetworkRegistry.newSimpleChannel( new ResourceLocation(valscraft.MODID, "main"), () -> PROTOCOL_VERSION, PROTOCOL_VERSION::equals, PROTOCOL_VERSION::equals ); public static void init() { int packetId = 0; // Register the mount synchronization packet CHANNEL.registerMessage( packetId++, MountSyncPacket.class, MountSyncPacket::encode, MountSyncPacket::decode, (msg, context) -> msg.handle(context.get()) // Get the context with context.get() ); } }  
    • Do you use features of inventory profiles next (ipnext) or is there a change without it?
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