I have an issue with adding data to an entity (mob). I want it to have a boolean value to determine whether it has a tracking device or not. However, the data doesn't get saved when I exit the game. Does anyone have an explaination for this? The variant of this mob does work correctly (and gets saved properly) and I have no idea what I did differently. See the relevant code below:

 

	private static final EntityDataAccessor<Integer> DATA_ID_TYPE_VARIANT =
            SynchedEntityData.defineId(AllosaurusEntityExample.class, EntityDataSerializers.INT);

    private static final EntityDataAccessor<Boolean> HAS_TRACKER =
            SynchedEntityData.defineId(AllosaurusEntityExample.class, EntityDataSerializers.BOOLEAN);

	public boolean hasTracker() {
        return this.entityData.get(HAS_TRACKER);
    }

    public void setTracker(boolean tracker) {
        this.entityData.set(HAS_TRACKER, tracker);
    }

    public InteractionResult addTracker(Player player) {
        this.entityData.set(HAS_TRACKER, true);

        Component confirmationMsg = new TextComponent("This " + this.getDisplayName().getString() + " now has a tracker");
        player.sendMessage(confirmationMsg, Util.NIL_UUID);

        return InteractionResult.SUCCESS;
    }

	/* ----- DATA SYNC ----- */
    @Override
    public void readAdditionalSaveData(CompoundTag tag) {
        super.readAdditionalSaveData(tag);
        this.entityData.set(DATA_ID_TYPE_VARIANT, tag.getInt("variant"));
        this.entityData.set(HAS_TRACKER, tag.getBoolean("hasTracker"));
        this.setTracker(tag.getBoolean("hasTracker"));
    }

    @Override
    public void addAdditionalSaveData(CompoundTag tag) {
        super.addAdditionalSaveData(tag);
        tag.putInt("variant", this.getTypeVariant());
        tag.putBoolean("hasTracker", this.hasTracker());
    }

    @Override
    protected void defineSynchedData() {
        super.defineSynchedData();
        this.entityData.define(DATA_ID_TYPE_VARIANT, 0);
        this.entityData.define(HAS_TRACKER, false);
    }

	/* ----- INTERACTION WITH ITEM ----- */
    @Override
    public InteractionResult mobInteract(Player player, InteractionHand hand) {
        Item item = player.getItemInHand(hand).getItem();

        Item addTrackerItem = ModItems.TRACKER.get();
        if (item == addTrackerItem && !this.hasTracker()) {
            if (this.level.isClientSide) {
                return this.addTracker(player);
            }
        }

        return super.mobInteract(player, hand);
    }

 

Edited August 17, 20223 yr by Myxtro
Changed title to indicate that the problem has been solved

10 minutes ago, diesieben07 said:

You are calling addTracker on the client. SynchedEntityData syncs from server to client only. You should set the data on the server, not the client.

What can I use to sync the data to the server instead?

Could you please elaborate? Because I thought the readAdditionalSaveData and addAdditionalSaveData took care of that.

18 minutes ago, Myxtro said:

Could you please elaborate?

You call #addTracker in #mobInteract client side, you need to check if your not on client:

if (!this.level.isClientSide) {
	// your code
}

 

18 minutes ago, Myxtro said:

Because I thought the readAdditionalSaveData and addAdditionalSaveData took care of that.

The methods are used to store the data on disk, not sending them through the network

Edited August 17, 20223 yr by Luis_ST

  

    @Override
    public InteractionResult mobInteract(Player player, InteractionHand hand) {
        Item item = player.getItemInHand(hand).getItem();

        Item addTrackerItem = ModItems.TRACKER.get();
        if (item == addTrackerItem && !this.hasTracker()) {

            // HERE: You are trying to add the tracker on the client when it should be on the server
            if (this.level.isClientSide) {
                return this.addTracker(player);
            }
        }

        // HERE: This will return PASS which means the server never sees this interaction
        return super.mobInteract(player, hand);
    }

Compare your code with for example how the creeper interacts with flint and steel.

Edited August 17, 20223 yr by warjort

Thanks guys, the problem was indeed that I had to change
 

this.level.isClientSide

To
 

!this.level.isClientSide