[NMS] DataWatcherRegistry issue

Hello ,

Like you know, now in 1.9.2, instead of doing this (when creating a new datawatcher):

Code (Text):

DataWatcher watcher = new DataWatcher(null);
watcher.a(6, (float) 20);

We need to do this:

Code (Text):

DataWatcher watcher = new DataWatcher(null);
watcher.set(DataWatcherRegistry.c.a(6), 20F);

What I understood:
In the last code, the variable "c" means that the second part of the method needs to be a java.lang.Float.
And each variable from DataWatcherRegistry was created for a special type. For example:

• DataWatcherRegistry.h → java.lang.Boolean
• DataWatcherRegistry.d → java.lang.String
• Etcetera...

Here is the list of all variables in DataWatcherRegistry class and their associated type:


I want to use the variable f because i need to add an ItemStack to the dataWatcher.
BUT, the variable f needs to be composed by the com.google.common.base.Optional class .

So i've tested a lot of ways...

Code (Text):

watcher.set(DataWatcherRegistry.f.a(5), Optional.of(myItemStack));

Code (Text):

watcher.set(DataWatcherRegistry.f.a(5), Optional.fromNullable(myItemStack));

But always → Null pointer exception (btw, the client was always kicked :/)

So, i'm here to ask you if you know how i can specify my itemstack with the class Optional.
I'm not a god in Java but i'm learning the basics so if how i explain things seems wrong, tell me how i can improve it.


Thanks for reading and please help me :3 ♥
I'm French so sorry for my explanations.
Any constructive idea is appreciated

Note: My main aim is to spawn a firework without spawning it (just the sound of explosion) but that's not the problem here

 

Yes, thanks