I am following this tutorial http://www.minecraftforum.net/forums/mapping-and-modding/mapping-and-modding-tutorials/1571567-1-7-2-1-6-4-eventhandler-and . My extendedEntity class never gets its loadNBTData method called and the data gets reset every time I exit Minecraft. How can I solve this?

Posting your code would be the logical first step.

Here is my extendedEntityClass

public class WerewolfData implements IExtendedEntityProperties {

public static final String PROP_NAME="WerewolfData";

private final EntityPlayer player;



private boolean isWerewolf=true;
private boolean isInWerewolfForm=true;



public WerewolfData(EntityPlayer player){
	this.player = player;
}

public static final void register(EntityPlayer player){
	player.registerExtendedProperties(PROP_NAME, new WerewolfData(player));
}

public static final WerewolfData get(EntityPlayer player){
	return (WerewolfData)player.getExtendedProperties(PROP_NAME);
}

@Override
public void saveNBTData(NBTTagCompound compound) {
	NBTTagCompound properties=new NBTTagCompound();

	properties.setBoolean("isWerewolf", isWerewolf);
	properties.setBoolean("isInWerewolfForm", isInWerewolfForm);

	compound.setTag(PROP_NAME, properties);
	System.out.println("has been saved");
}

@Override
public void loadNBTData(NBTTagCompound compound) {
	NBTTagCompound properties = (NBTTagCompound)compound.getTag(PROP_NAME);

	isWerewolf = properties.getBoolean("isWerewolf");
	isInWerewolfForm = properties.getBoolean("isInWerewolfForm");
	System.out.println("has been loaded");
}

@Override
public void init(Entity entity, World world) {
	// TODO Auto-generated method stub

}


public final void makeWerewolf(boolean input){
	isWerewolf=input;
}

public final boolean isWerewolf(){
	return isWerewolf;
}

public final void changeIntoWerewolfForm(boolean input){
	isInWerewolfForm=input;
}

public final boolean isInWerewolfForm(){
	return isInWerewolfForm;
}

}

 

Here is my constructing event.

@SubscribeEvent(priority = EventPriority.NORMAL, receiveCanceled=true)
public void constructPlayers(EntityConstructing event){
	if(event.entity instanceof EntityPlayer){
		EntityPlayer player=(EntityPlayer)event.entity;
		WerewolfData.register((EntityPlayer)event.entity);
		System.out.println("fdafasfa");
	}
}

Why receiveCanceled is true?

No particular reason. I just use the same annotation for all my events to stay consistent.

You don't need to cancel EntityConstructing event.

After some testing I discovered the problem. The values for the client are reset when Minecraft starts and the values for the server are loaded. How can I fix these syncing issues? Should I use packets?

Or DataWatchers.

I am confused on the client and the server communications. Is all the data allocated on the server and the client? Is why I must send some data in packets or use the data watcher. Is the construction event server side only? That would explain why the client would need to have its data updated.

Construction / NBT loading is only done on the server, so anything you want the client to know about, you need to send a packet.