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  1. I have a block, and I want to do some logic when it is added to the world. I am using the onBlockAdded method to accomplish this. However, the method is being called twice, and I'm not sure why. Minmum reproduction using the examplemod from `forge-1.16.4-35.1.0-mdk` ExampleMod.java package com.example.examplemod; import net.minecraft.block.AbstractBlock; import net.minecraft.block.Block; import net.minecraft.block.Blocks; import net.minecraft.block.material.Material; import net.minecraft.item.BlockItem; import net.minecraft.item.Item; import net.minecraft.item.ItemGroup; import net.minecraft.item.ItemStack; import net.minecraftforge.common.MinecraftForge; import net.minecraftforge.event.RegistryEvent; import net.minecraftforge.eventbus.api.SubscribeEvent; import net.minecraftforge.fml.InterModComms; import net.minecraftforge.fml.common.Mod; import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent; import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent; import net.minecraftforge.fml.event.lifecycle.InterModEnqueueEvent; import net.minecraftforge.fml.event.lifecycle.InterModProcessEvent; import net.minecraftforge.fml.event.server.FMLServerStartingEvent; import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext; import net.minecraftforge.registries.ObjectHolder; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; import java.util.stream.Collectors; // The value here should match an entry in the META-INF/mods.toml file @Mod("examplemod") public class ExampleMod { // Directly reference a log4j logger. private static final Logger LOGGER = LogManager.getLogger(); public ExampleMod() { // Register the setup method for modloading FMLJavaModLoadingContext.get().getModEventBus().addListener(this::setup); // Register the enqueueIMC method for modloading FMLJavaModLoadingContext.get().getModEventBus().addListener(this::enqueueIMC); // Register the processIMC method for modloading FMLJavaModLoadingContext.get().getModEventBus().addListener(this::processIMC); // Register the doClientStuff method for modloading FMLJavaModLoadingContext.get().getModEventBus().addListener(this::doClientStuff); // Register ourselves for server and other game events we are interested in MinecraftForge.EVENT_BUS.register(this); } private void setup(final FMLCommonSetupEvent event) { // some preinit code LOGGER.info("HELLO FROM PREINIT"); } private void doClientStuff(final FMLClientSetupEvent event) { // do something that can only be done on the client LOGGER.info("Got game settings {}", event.getMinecraftSupplier().get().gameSettings); } private void enqueueIMC(final InterModEnqueueEvent event) { // some example code to dispatch IMC to another mod InterModComms.sendTo("examplemod", "helloworld", () -> { LOGGER.info("Hello world from the MDK"); return "Hello world";}); } private void processIMC(final InterModProcessEvent event) { // some example code to receive and process InterModComms from other mods LOGGER.info("Got IMC {}", event.getIMCStream(). map(m->m.getMessageSupplier().get()). collect(Collectors.toList())); } // You can use SubscribeEvent and let the Event Bus discover methods to call @SubscribeEvent public void onServerStarting(FMLServerStartingEvent event) { // do something when the server starts LOGGER.info("HELLO from server starting"); } @ObjectHolder("examplemod") public static final class Blocks { public static final Block EXAMPLEBLOCK = null; } // You can use EventBusSubscriber to automatically subscribe events on the contained class (this is subscribing to the MOD // Event bus for receiving Registry Events) @Mod.EventBusSubscriber(bus=Mod.EventBusSubscriber.Bus.MOD) public static class RegistryEvents { @SubscribeEvent public static void onBlocksRegistry(final RegistryEvent.Register<Block> blockRegistryEvent) { // register a new block here LOGGER.info("HELLO from Register Block"); blockRegistryEvent.getRegistry().register( new ExampleBlock(AbstractBlock.Properties.create(Material.IRON)).setRegistryName("examplemod","exampleblock") ); } @SubscribeEvent public static void onRegisterItems(final RegistryEvent.Register<Item> e) { Item item = new BlockItem(Blocks.EXAMPLEBLOCK, new Item.Properties().group(new ItemGroup(-1, "examplegroup"){ @Override public ItemStack createIcon() { return new ItemStack(Blocks.EXAMPLEBLOCK); } })).setRegistryName("examplemod","exampleblock"); e.getRegistry().register(item); } } } ExampleBlock.java package com.example.examplemod; import net.minecraft.block.Block; import net.minecraft.block.BlockState; import net.minecraft.util.math.BlockPos; import net.minecraft.world.World; public class ExampleBlock extends Block { public ExampleBlock(Properties properties) { super(properties); } @Override public void onBlockAdded( BlockState state, World worldIn, BlockPos pos, BlockState oldState, boolean isMoving ) { super.onBlockAdded(state, worldIn, pos, oldState, isMoving); System.out.println("ADDED! " + worldIn.isRemote); } } Right clicking once places the block in the world as expected However, the method is being called twice. [02:40:40] [Server thread/INFO] [STDOUT/]: [com.example.examplemod.ExampleBlock:onBlockAdded:19]: ADDED! false [02:40:40] [Server thread/INFO] [STDOUT/]: [com.example.examplemod.ExampleBlock:onBlockAdded:19]: ADDED! false Stack from the first call: onBlockAdded:18, ExampleBlock (com.example.examplemod) onBlockAdded:702, AbstractBlock$AbstractBlockState (net.minecraft.block) setBlockState:285, Chunk (net.minecraft.world.chunk) setBlockState:228, World (net.minecraft.world) setBlockState:205, World (net.minecraft.world) placeBlock:152, BlockItem (net.minecraft.item) tryPlace:57, BlockItem (net.minecraft.item) onItemUse:42, BlockItem (net.minecraft.item) onPlaceItemIntoWorld:607, ForgeHooks (net.minecraftforge.common) onItemUse:191, ItemStack (net.minecraft.item) func_219441_a:359, PlayerInteractionManager (net.minecraft.server.management) processTryUseItemOnBlock:986, ServerPlayNetHandler (net.minecraft.network.play) processPacket:45, CPlayerTryUseItemOnBlockPacket (net.minecraft.network.play.client) processPacket:12, CPlayerTryUseItemOnBlockPacket (net.minecraft.network.play.client) lambda$checkThreadAndEnqueue$0:19, PacketThreadUtil (net.minecraft.network) run:-1, 1364657741 (net.minecraft.network.PacketThreadUtil$$Lambda$5784) run:20, TickDelayedTask (net.minecraft.util.concurrent) run:139, ThreadTaskExecutor (net.minecraft.util.concurrent) run:22, RecursiveEventLoop (net.minecraft.util.concurrent) run:758, MinecraftServer (net.minecraft.server) run:159, MinecraftServer (net.minecraft.server) driveOne:109, ThreadTaskExecutor (net.minecraft.util.concurrent) driveOneInternal:741, MinecraftServer (net.minecraft.server) driveOne:735, MinecraftServer (net.minecraft.server) driveUntil:122, ThreadTaskExecutor (net.minecraft.util.concurrent) runScheduledTasks:721, MinecraftServer (net.minecraft.server) func_240802_v_:667, MinecraftServer (net.minecraft.server) lambda$startServer$0:233, MinecraftServer (net.minecraft.server) run:-1, 830477086 (net.minecraft.server.MinecraftServer$$Lambda$5086) run:748, Thread (java.lang) Stack from the second call: onBlockAdded:18, ExampleBlock (com.example.examplemod) onBlockAdded:702, AbstractBlock$AbstractBlockState (net.minecraft.block) onPlaceItemIntoWorld:666, ForgeHooks (net.minecraftforge.common) onItemUse:191, ItemStack (net.minecraft.item) func_219441_a:359, PlayerInteractionManager (net.minecraft.server.management) processTryUseItemOnBlock:986, ServerPlayNetHandler (net.minecraft.network.play) processPacket:45, CPlayerTryUseItemOnBlockPacket (net.minecraft.network.play.client) processPacket:12, CPlayerTryUseItemOnBlockPacket (net.minecraft.network.play.client) lambda$checkThreadAndEnqueue$0:19, PacketThreadUtil (net.minecraft.network) run:-1, 1364657741 (net.minecraft.network.PacketThreadUtil$$Lambda$5784) run:20, TickDelayedTask (net.minecraft.util.concurrent) run:139, ThreadTaskExecutor (net.minecraft.util.concurrent) run:22, RecursiveEventLoop (net.minecraft.util.concurrent) run:758, MinecraftServer (net.minecraft.server) run:159, MinecraftServer (net.minecraft.server) driveOne:109, ThreadTaskExecutor (net.minecraft.util.concurrent) driveOneInternal:741, MinecraftServer (net.minecraft.server) driveOne:735, MinecraftServer (net.minecraft.server) driveUntil:122, ThreadTaskExecutor (net.minecraft.util.concurrent) runScheduledTasks:721, MinecraftServer (net.minecraft.server) func_240802_v_:667, MinecraftServer (net.minecraft.server) lambda$startServer$0:233, MinecraftServer (net.minecraft.server) run:-1, 830477086 (net.minecraft.server.MinecraftServer$$Lambda$5086) run:748, Thread (java.lang) Being in survival mode exhibits the same behaviour. Am I registering something wrong? Failing to implement some method that has been unnecessary until I wanted to override onBlockAdded? Is it actually deprecated in favour of a separate method, or is it just "minecraft deprecated"? I'd appreciate any insights, thank you. ExampleBlock.java ExampleMod.java
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