Hello i whant to create entitys (Armor_Stand) that dont be storaged to world. After restarting the Server they should disappear.
While it doesnt prevent the saving. You could create a plugin that listens for the LoadWorldEvent and then remove all entities you wish.
Not all entities are loaded on world load. They are loaded only when the chunk they are is loaded.
CVDH, you could listen to the DestructEntityEvent by unload (there’s a subevent that is called on unload) and kill the entity, or keep track of the entities you spawn and kill them all on the world unload event.