Luis_ST

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the 'script' only starts the jar of the server, the main server is start via java. If you want to modify how the server is start the you need to write a custom Launcher which is not supported and not recommended

thats not the full debug log

it's the place flage of the Block, you can look at Constants.BlockFlags for more infos about possible values and what they does

i've test your code and unfortunately i can't tell you what'S exactly is the problem the only thing i can tell you is that HalfTransparentBlock#skipRendering is not called, but i don't know why sorry

you need to call Level#setBlock to replace the Block in the World

post a git repo so i can debug this local, since your code looks okay it should work

show the Registry Entry of your ColoredSlimeBlock

post full debug log

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you need to register the Block itself and the BlockItem for it

which class/package is relevant or where should i look into?

this is the Item Registration

create your own Thread, post debug log

show your Block Registration and do never use @OnlyIn it's only for vanilla

you can use ItemStack#getItem to get the Item, then check if the Item an instance of ArmorItem. then use ArmorItem#getDefense to get the Armor value

show your Block class and your Registration

No it's not, no less complicated than the code you are currently using, also your code is bad for performance since you run it each tick

Not the Entity itself, the TargetGoal of the Entity. If you want to do that, create a custom TargetGoal and replace it in EntityJoinWorldEvent

the error is throw, since your java installation is broken. Did you completely uninstalled java befor reinstall java?

with the way you use, no. If you want to avoid that, you need to replace the Target Goal of the Entity. btw, this is the better way to prevent monsters from attacking the Player instead setting the target to null

Note basic java is required for modding minecraft

https://forge.gemwire.uk/wiki/Capabilities#Attaching_a_Capability do the same thing but with LevelChunk