Failed to find NMS class: DataWatcherRegistry

[rmue11er]

Hello, I get this error on my spigot 1.8.8 server whenever is use a Plugin that uses ProtocolLib.

RuntimeException: Failed to find NMS class: DataWatcherRegistry

ProtocolLib itself loads without an error. the error occurs for example when I do the following:

acketContainer packet = protocolManager.createPacket(PacketType.Play.Server.SPAWN_ENTITY);

		WrapperPlayServerEntityMetadata packet2 = new WrapperPlayServerEntityMetadata();
		// Set the entity to associate the packet with, which in this case is the client-side entity we created before.
		packet2.setEntityId(78);
		// Create a ProtocolLib WrappedDataWatcher from the entity's current metadata.
		WrappedDataWatcher dataWatcher = new WrappedDataWatcher(packet2.getEntityMetadata());
		WrappedDataWatcher.WrappedDataWatcherObject isInvisibleIndex = new WrappedDataWatcher.WrappedDataWatcherObject(0, WrappedDataWatcher.Registry.get(Byte.class));
		dataWatcher.setObject(isInvisibleIndex, (byte) 0x20);
		WrappedDataWatcher.WrappedDataWatcherObject nameValue = new WrappedDataWatcher.WrappedDataWatcherObject(2, WrappedDataWatcher.Registry.get(String.class));
		WrappedDataWatcher.WrappedDataWatcherObject nameVisible = new WrappedDataWatcher.WrappedDataWatcherObject(3, WrappedDataWatcher.Registry.get(Boolean.class));

		dataWatcher.setObject(nameValue, "§aHello, " + p.getDisplayName() + "!");
		dataWatcher.setObject(nameVisible, true);
		packet2.setEntityMetadata(dataWatcher.getWatchableObjects());
		packet2.sendPacket(p);

Full error:

Caused by: java.lang.RuntimeException: Failed to find NMS class: DataWatcherRegistry
at com.comphenix.protocol.utility.MinecraftReflection.lambda$getMinecraftClass$1(MinecraftReflection.java:2025) ~[?:?]
at java.util.Optional.orElseThrow(Optional.java:290) ~[?:1.8.0_212]
at com.comphenix.protocol.utility.MinecraftReflection.getMinecraftClass(MinecraftReflection.java:2025) ~[?:?]
at com.comphenix.protocol.utility.MinecraftReflection.getDataWatcherRegistryClass(MinecraftReflection.java:1372) ~[?:?]
at com.comphenix.protocol.wrappers.WrappedDataWatcher$Registry.initialize(WrappedDataWatcher.java:994) ~[?:?]
at com.comphenix.protocol.wrappers.WrappedDataWatcher$Registry.get(WrappedDataWatcher.java:932) ~[?:?]
at de.krextiv.test.modules.connect.JoinQuitEvent.rankDisplay(JoinQuitEvent.java:48) ~[?:?]
at de.krextiv.test.modules.connect.JoinQuitEvent.onJoin(JoinQuitEvent.java:117) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_212]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_212]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[server.jar:git-Spigot-21fe707-e1ebe52]
... 14 more

using the latest protocollib version available for download that says that it is for 1.8 version.

[dmulloy2]

Yeah so you have to use the old data watcher setup without the registry on 1.8. should be examples around but I'm on mobile

[Ultra03]

@dmulloy2 Sorry to bring up a relatively old issue, but where can I find these examples? I've been searching around for a while but haven't found anything.

[dmulloy2]

@Ultra03 it looks like the old examples have vanished (likely to do with curse forge redoing their website). The gist of it is that the old API was a lot simpler than the new one -- you don't have to worry about the watcher registry or anything like that. Take a look at the WrappedDataWatcher and the WrappedWatchableObject docs