Leaderboard

You are still doing it in init.

Here I'll show the final code that definitly works for me: //spawn structure if (!worldIn.isRemote) { WorldServer worldserver = (WorldServer) worldIn; MinecraftServer minecraftserver = worldIn.getMinecraftServer(); TemplateManager templatemanager = worldserver.getStructureTemplateManager(); ResourceLocation loc = new ResourceLocation(Reference.MOD_ID,"t1"); Template template = templatemanager.getTemplate(minecraftserver, loc); Utils.getLogger().info("=======0======="+template); if (template != null) { worldIn.notifyBlockUpdate(pos, iblockstate, iblockstate, 3); PlacementSettings placementsettings = (new PlacementSettings()).setMirror(Mirror.NONE) .setRotation(Rotation.NONE).setIgnoreEntities(false).setChunk((ChunkPos) null) .setReplacedBlock((Block) null).setIgnoreStructureBlock(false); Utils.getLogger().info("=======1======="+loc); template.addBlocksToWorld(worldIn, pos, placementsettings); Utils.getLogger().info("========2======="+pos); } }

Store the World in the constructor (i.e. on the network thread), but only call World#getEntityByID in the run method (i.e. on the main thread). That looks correct, yes.