I'm working on a claim system mod, and I'm using WorldSavedData to serialize the claims, including UUIDs of owners/members. However, I've run into an issue. When the data is saved, it saves with the proper UUID, confirmed by NBTExplorer.

However upon loading the data, if I use UUIDs instead of strings I get 000000-00000-0000 as my UUID

and if I use strings and parse it into a UUID, I get an invalid string that causes a crash. (Presumably empty string or 00000-000-000)

^{See comment below.}

The integer array loads properly and I've ensured everything is serverside.

Another issue I've run into is that the data from the nether isn't saved.

There's no dat file, even though I am using perWorldStorage.

 

Here's how my serializer works.

It starts in my event handler, which has the following events:

@SubscribeEvent
	public void onWorldLoad(WorldEvent.Load e) {
		if(!e.getWorld().isRemote) {
			ClaimManager.getManager().deserialize(e.getWorld());
		}
	}

	@SubscribeEvent
	public void onWorldSave(WorldEvent.Save e) {
		if(!e.getWorld().isRemote) {
			ClaimManager.getManager().serialize(e.getWorld());
		}
	}

Which both of the following fire properly and go to my ClaimManager (responsible for adding and removing claims from the official claims list)
These two methods are the beef of the bunch:

Spoiler

 

/** Forces a world to save claim data 
	 * @param world - The world to be saved **/
	public void serialize(World world) {
		if(!world.isRemote) {
			ClaimSerializer store = ClaimSerializer.get(world);
			for(ClaimArea claim : claims) {
				if(claim.getDimensionID() == world.provider.getDimension()) {
					int[] claimVals = claim.getSelfAsInt();
					UUID owner = claim.getOwner();
					UUID ownerOffline = claim.getOwnerOffline();
					String serialName = claim.getSerialName();
					NBTTagCompound data = new NBTTagCompound();
					data.setIntArray("CLAIMINFO", claimVals);
					data.setString("OWNERUID", owner.toString());
					data.setString("OWNERUIDOFF", ownerOffline.toString());
					System.out.println("Owner: " + owner);
					for(EnumPerm perm : EnumPerm.values()) {
						NBTTagCompound members = new NBTTagCompound();
						for(UUID member : claim.getArrayForPermission(perm)) {
							members.setString("MEMBER_" + member.toString(), member.toString());
						}
						data.setTag("MEMBERS_" + perm.name(), members);
					}
					store.data.setTag("CLAIM_" + serialName, data);
					store.markDirty();
					System.out.println("Saving claim: " + serialName);
				}
			}
		}
	}

	/** Forces a world to load claim data. 
	 * Overwrites new claim data since last load!
	 * @param world - The world to be saved **/
	public void deserialize(World world) {
		if(!world.isRemote) {
			ClaimSerializer store = ClaimSerializer.get(world);
			NBTTagCompound comp = store.data;
			if(comp != null ) {
				for(String key : comp.getKeySet()) {
					System.out.println("Loading " + key);
					NBTTagCompound data = comp.getCompoundTag(key);
					int[] claimVals = data.getIntArray("CLAIMINFO");
					UUID owner = UUID.fromString(comp.getString("OWNERUID"));
					UUID ownerOffline = UUID.fromString(comp.getString("OWNERUIDOFF"));
					System.out.println("Owner: " + owner);
					if(claimVals.length > 0 && claimVals[0] == 0 && claimVals[1] == world.provider.getDimension()) {
						System.out.println("Valid version.");
						ClaimArea claim = new ClaimArea(claimVals[1], claimVals[2], claimVals[3], claimVals[4], claimVals[5], owner, ownerOffline);
						for(String key2 : data.getKeySet()) {
							if(key2.startsWith("MEMBERS_")) {
								NBTTagCompound members = data.getCompoundTag(key2);
								for(String key3 : members.getKeySet()) {
									if(key3.startsWith("MEMBER_")) {
										UUID member = UUID.fromString(members.getString(key3));
										claim.addMember(EnumPerm.valueOf(key2.replaceAll("MEMBERS_", "")), member);
									}
								}
							}
						}
						this.addClaim(claim);
					} else {
						ClaimIt.logger.log(Level.FATAL, "Detected version that doesn't exist yet! Mod was downgraded? Claim cannot be loaded.");
					}
				}
			}
		}
	}

 

This is my actual WorldSavedData (ClaimSerializer):

public class ClaimSerializer extends WorldSavedData {
	private static final String DATA_NAME = Ref.MOD_ID + "_ClaimsData";
	public NBTTagCompound data = new NBTTagCompound();
	
	public ClaimSerializer() {
		super(DATA_NAME);
	}
	
	public ClaimSerializer(String s) {
		super(s);
	}
	
	@Override
	public void readFromNBT(NBTTagCompound nbt) {
		data = nbt;
	}
	@Override
	public NBTTagCompound writeToNBT(NBTTagCompound compound) {
		compound = data;
		return compound;
	}
	
	public static ClaimSerializer get(World world) {
		ClaimSerializer save = (ClaimSerializer) world.getPerWorldStorage().getOrLoadData(ClaimSerializer.class, DATA_NAME);
		if(save == null) {
			save = new ClaimSerializer();
			world.getMapStorage().setData(DATA_NAME, save);
		}
		return save;
	}
}

 

As you can see, it uses getPerWorldStorage, and is provided the world instance from the original event to return a storage, but for some reason nothing is saved to the nether. I've tested this on both a server and singleplayer. It always loads as an empty UUID and doesn't save nether info. The UUID issue only happens when the game is exited and started. Any ideas?

 

For more context, my source: https://github.com/itsmeow/ClaimIt/tree/master/src/main/java/its_meow/claimit

Edited December 20, 20186 yr by hiotewdew
Mark as solved

Nevermind on the UUID issue. I am doing comp.getString() which is not the same as data.getString(). But the nether issue still stands.

Why are you using WorldSavedData? AFAIK that's one per minecraft save file. If you want one per dimension use capabilities.

18 hours ago, V0idWa1k3r said:

Why are you using WorldSavedData? AFAIK that's one per minecraft save file. If you want one per dimension use capabilities.

A world capability is just a wrapper around a WorldSavedData anyways.

Figured it out. My get method uses both getMapStorage and getPerWorldStorage.

public static ClaimSerializer get(World world) {
  // PER WORLD STORAGE
		ClaimSerializer save = (ClaimSerializer) world.getPerWorldStorage().getOrLoadData(ClaimSerializer.class, DATA_NAME);
		if(save == null) {
			save = new ClaimSerializer();
          // MAP STORAGE!
			world.getMapStorage().setData(DATA_NAME, save); 
		}
		return save;
	}