My custom Frost Walker Enchantment doesn't recover the block after some time [solved]

Enderlook · August 6, 2018

I'm trying to make a custom Frost Walker that instead of turn water into ice it will turn lava sources into obsidian and lava flows into cobblestone.

Also, I want that after some time, that cobblestone and obsidian turns into lava again like in Frost walker.

My problems are two:

It isn't able to turn lava flows. It only works in sources (Pseudo-fixed below).
It doesn't turn back blocks after a while.

Here is my code:

@SubscribeEvent
	public static void stonewalker(LivingUpdateEvent event) {	
		int level = EnchantmentHelper.getMaxEnchantmentLevel(ENCHANTMENT_STONE_WALKER, event.getEntityLiving());
		if(level > 0) {
			Entity entity = event.getEntity();
			EntityLivingBase entityLiving = event.getEntityLiving();
			World world = entity.world;
			if(!world.isRemote && entityLiving.onGround) {
				int r = level + 2;				
				BlockPos pos = entity.getPosition();
				for (int x = -r; x <= r; x++) {
					for (int z = -r; z <= r; z++) {
						BlockPos blockpos = pos.add(x,-1,z);						
						if(blockpos.distanceSq(pos.getX(), pos.getY(), pos.getZ()) > r*r) {
							continue;
						}
						IBlockState iblockstate = world.getBlockState(blockpos);
						if (iblockstate.getMaterial() == Material.LAVA && (iblockstate.getBlock() == Blocks.LAVA || iblockstate.getBlock() == Blocks.FLOWING_LAVA) && ((Integer)iblockstate.getValue(BlockLiquid.LEVEL)).intValue() == 0 && world.mayPlace(Blocks.OBSIDIAN, blockpos, false, EnumFacing.DOWN, (Entity)null)) {
							 world.setBlockState(blockpos, Blocks.OBSIDIAN.getDefaultState());
	                         world.scheduleUpdate(blockpos.toImmutable(), Blocks.OBSIDIAN, MathHelper.getInt(entityLiving.getRNG(), 60, 120));
						}
					}
				}
			}
		}
	};

I think the problems may be in the last if block statement.

This: `iblockstate.getMaterial() == Material.LAVA && (iblockstate.getBlock() == Blocks.LAVA || iblockstate.getBlock() == Blocks.FLOWING_LAVA) && ((Integer)iblockstate.getValue(BlockLiquid.LEVEL)).intValue() == 0 && world.mayPlace(Blocks.COBBLESTONE, blockpos, false, EnumFacing.DOWN, (Entity)null)`.
- I'm not sure how works this part `((Integer)iblockstate.getValue(BlockLiquid.LEVEL)).intValue()`.
- I noted that if I delete that part, it's able to turn lava flows, but I was wondering why Minecraft has that in Frost Walker enchantment.
Also, I think this line make the timer: `world.scheduleUpdate(blockpos.toImmutable(), Blocks.OBSIDIAN, MathHelper.getInt(entityLiving.getRNG(), 60, 120));` but I am not sure how to ask to "world" turn back the block after the time expires.

The first problem can be fixed in this way:

						if (iblockstate.getMaterial() == Material.LAVA && (iblockstate.getBlock() == Blocks.LAVA || iblockstate.getBlock() == Blocks.FLOWING_LAVA) && world.mayPlace(Blocks.OBSIDIAN, blockpos, false, EnumFacing.DOWN, (Entity)null)) {
							if (((Integer)iblockstate.getValue(BlockLiquid.LEVEL)).intValue() == 0) {
								world.setBlockState(blockpos, Blocks.OBSIDIAN.getDefaultState());
								world.scheduleUpdate(blockpos.toImmutable(), Blocks.OBSIDIAN, MathHelper.getInt(entityLiving.getRNG(), 60, 120));
							} else {							
								world.setBlockState(blockpos, Blocks.COBBLESTONE.getDefaultState());
								world.scheduleUpdate(blockpos.toImmutable(), Blocks.COBBLESTONE, MathHelper.getInt(entityLiving.getRNG(), 60, 120));
							}
						}

Not sure the second one.

Edited August 6, 2018 by Enderlook

Cadiboo · August 6, 2018

I believe vanilla turns back blocks by not placing actual ice, but placing special ice that turns back by itself.

Enderlook · August 6, 2018

12 minutes ago, Cadiboo said:

I believe vanilla turns back blocks by not placing actual ice, but placing special ice that turns back by itself.

You have right: https://minecraft.gamepedia.com/Frosted_Ice

So, what is the purpose of?:

world.scheduleUpdate(blockpos.toImmutable(), Blocks.COBBLESTONE, MathHelper.getInt(entityLiving.getRNG(), 60, 120));

Edited August 6, 2018 by Enderlook

Draco18s · August 6, 2018

26 minutes ago, Enderlook said:

I'm not sure how works this part `((Integer)iblockstate.getValue(BlockLiquid.LEVEL)).intValue()`.

liquid level 0 = source block. Frost Walker only turns source blocks into things.

26 minutes ago, Enderlook said:

but I am not sure how to ask to "world" turn back the block after the time expires.

As Cadiboo says, Frost Walker doesn't make ice, it uses a separate block.

https://minecraft.gamepedia.com/Frosted_Ice

Cadiboo · August 6, 2018

4 minutes ago, Enderlook said:
You have right: https://minecraft.gamepedia.com/Frosted_Ice

So, what is the purpose of?:
world.scheduleUpdate(blockpos.toImmutable(), Blocks.COBBLESTONE, MathHelper.getInt(entityLiving.getRNG(), 60, 120));

Telling the block that it should update. This does nothing for normal blocks, however for the Frosted ice it probably (I assume) will trigger a possible melt

Edited August 6, 2018 by Cadiboo

Cadiboo · August 6, 2018

Just now, Cadiboo said:

Telling the block that it should update. This does nothing for normal blocks, however for the Frosted ice it will trigger a possible melt

You could make blocks that extend frosted ice and just set their blockstates to point to the vanilla block models (cobble, obsidian)

Enderlook · August 6, 2018

1 minute ago, Cadiboo said:

Telling the block that it should update. This does nothing for normal blocks, however for the Frosted ice it will trigger a possible melt

Oh, that is interesting!

Enderlook · August 6, 2018

Any idea of where can I get the source code of Frosted Ice? I would like to see it but I can't find it.

Cadiboo · August 6, 2018

2 minutes ago, Enderlook said:

Any idea of where can I get the source code of Frosted Ice? I would like to see it but I can't find it.

Use your IDE to look for it, it’s probably under net.minecraft.block

Enderlook · August 6, 2018

33 minutes ago, Cadiboo said:

Use your IDE to look for it, it’s probably under net.minecraft.block

Oh, I was looking in blocks. That is why I haven't found it!

Edited August 6, 2018 by DaemonUmbra
Removed Copyrighted Code

Enderlook · August 6, 2018

I've made a custom block, called `petrify_obsidian` (just a basic block) in order to spawn it with my "stone_walker". But each time I try to use my enchantment it crashes the game, and if I replace it with normal obsidian, it doesn't.

What am I doing wrong?

I just changed `Blocks.OBSIDIAN` to `ModBlocks.PETRIFY_OBSIDIAN_BLOCK`.

I think the problem may be with the way I register it, but not sure.

@EventBusSubscriber(modid = ExtraCraft.MOD_ID)
public class ModBlocks {

	@ObjectHolder(ExtraCraft.MOD_ID + ":petrify_obsidian_block")
	public static final BlockPetrifyObsidian BLOCK_PETRIFY_OBSIDIAN = null;
	
	private static CBlockBasic[] BLOCK_BASIC;
	
	public static void init() {
		BLOCK_BASIC = new CBlockBasic[] {
			new BlockPetrifyObsidian()
		};
	}
	
	
	@SideOnly(Side.CLIENT)
	public static void initializeBlockModels() {	
		for (CBlockBasic block : BLOCK_BASIC) {
			block.initializeModel();
		}
	};

	@SubscribeEvent
	public static void registerBlocks(final RegistryEvent.Register<Block> event) {
		final IForgeRegistry<Block> registry = event.getRegistry();		
		registry.registerAll(BLOCK_BASIC);	
	};
	
	@SubscribeEvent
	public static void registerItemBlocks(final RegistryEvent.Register<Item> event) {
		for (CBlockBasic block : BLOCK_BASIC) {
			block.registerItemBlock(event);
		}
	}
}

Init is called on:

@Mod(modid = ExtraCraft.MOD_ID, name = ExtraCraft.NAME, version = ExtraCraft.VERSION)
@EventBusSubscriber(modid = ExtraCraft.MOD_ID)
public class ExtraCraft implements IProxy {
	// [...]
	@Override
	@EventHandler
	public void preInitializationEvent(FMLPreInitializationEvent event) {
		ModBlocks.init();
	}
	// [...]
}

I think that the registration of my enchantment event is being done before my block initialization (null exception), but I don't know how to change the order.

Description: Ticking player
java.lang.NullPointerException: Ticking player
	at net.minecraft.world.World.mayPlace(World.java:3435)
	at net.enderlook.extracraft.init.ModEnchantments.stonewalker(ModEnchantments.java:69)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_8_ModEnchantments_stonewalker_LivingUpdateEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
	at net.minecraftforge.common.ForgeHooks.onLivingUpdate(ForgeHooks.java:566)
	at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2312)
	at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:272)
	at net.minecraft.entity.player.EntityPlayerMP.onUpdateEntity(EntityPlayerMP.java:423)
	at net.minecraft.network.NetHandlerPlayServer.update(NetHandlerPlayServer.java:185)
	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.update(NetworkDispatcher.java:212)
	at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:307)
	at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:197)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:865)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592)
	at java.lang.Thread.run(Unknown Source)

What can I do?

Animefan8888 · August 6, 2018

3 minutes ago, Enderlook said:

I've made a custom block, called `petrify_obsidian` (just a basic block) in order to spawn it with my "stone_walker". But each time I try to use my enchantment it crashes the game, and if I replace it with normal obsidian, it doesn't.

What am I doing wrong?

I just changed `Blocks.OBSIDIAN` to `ModBlocks.PETRIFY_OBSIDIAN_BLOCK`.

I think the problem may be with the way I register it, but not sure.


@EventBusSubscriber(modid = ExtraCraft.MOD_ID)
public class ModBlocks {

	@ObjectHolder(ExtraCraft.MOD_ID + ":petrify_obsidian_block")
	public static final BlockPetrifyObsidian BLOCK_PETRIFY_OBSIDIAN = null;
	
	private static CBlockBasic[] BLOCK_BASIC;
	
	public static void init() {
		BLOCK_BASIC = new CBlockBasic[] {
			new BlockPetrifyObsidian()
		};
	}
	
	
	@SideOnly(Side.CLIENT)
	public static void initializeBlockModels() {	
		for (CBlockBasic block : BLOCK_BASIC) {
			block.initializeModel();
		}
	};

	@SubscribeEvent
	public static void registerBlocks(final RegistryEvent.Register<Block> event) {
		final IForgeRegistry<Block> registry = event.getRegistry();		
		registry.registerAll(BLOCK_BASIC);	
	};
	
	@SubscribeEvent
	public static void registerItemBlocks(final RegistryEvent.Register<Item> event) {
		for (CBlockBasic block : BLOCK_BASIC) {
			block.registerItemBlock(event);
		}
	}
}

Init is called on:


@Mod(modid = ExtraCraft.MOD_ID, name = ExtraCraft.NAME, version = ExtraCraft.VERSION)
@EventBusSubscriber(modid = ExtraCraft.MOD_ID)
public class ExtraCraft implements IProxy {
	// [...]
	@Override
	@EventHandler
	public void preInitializationEvent(FMLPreInitializationEvent event) {
		ModBlocks.init();
	}
	// [...]
}

I think that the registration of my enchantment event is being done before my block initialization (null exception), but I don't know how to change the order.


Description: Ticking player
java.lang.NullPointerException: Ticking player
	at net.minecraft.world.World.mayPlace(World.java:3435)
	at net.enderlook.extracraft.init.ModEnchantments.stonewalker(ModEnchantments.java:69)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_8_ModEnchantments_stonewalker_LivingUpdateEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
	at net.minecraftforge.common.ForgeHooks.onLivingUpdate(ForgeHooks.java:566)
	at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2312)
	at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:272)
	at net.minecraft.entity.player.EntityPlayerMP.onUpdateEntity(EntityPlayerMP.java:423)
	at net.minecraft.network.NetHandlerPlayServer.update(NetHandlerPlayServer.java:185)
	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.update(NetworkDispatcher.java:212)
	at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:307)
	at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:197)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:865)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592)
	at java.lang.Thread.run(Unknown Source)

What can I do?

Something is null on line 69 of ModEnchantments

Enderlook · August 6, 2018

2 hours ago, Animefan8888 said:

Something is null on line 69 of ModEnchantments

I know, the line 69 is:

if (iblockstate.getMaterial() == Material.LAVA && (iblockstate.getBlock() == Blocks.LAVA || iblockstate.getBlock() == Blocks.FLOWING_LAVA) && world.mayPlace(ModBlocks.BLOCK_PETRIFY_OBSIDIAN, blockpos, false, EnumFacing.DOWN, (Entity)null)) {

I'm quite sure the null may be `ModBlocks.BLOCK_PETRIFY_OBSIDIAN`, that is why I'm asking how can I fix it. That block is initialized automatically by Minecraft:

@EventBusSubscriber(modid = ExtraCraft.MOD_ID)
public class ModBlocks {
	// [...]
	@ObjectHolder(ExtraCraft.MOD_ID + ":petrify_obsidian_block")
	public static final BlockPetrifyObsidian BLOCK_PETRIFY_OBSIDIAN = null;
	// [...]
}

And also the enchantment is initialized by Minecraft:

@EventBusSubscriber(modid=ExtraCraft.MOD_ID)
public class ModEnchantments {
	// [...]
	@SubscribeEvent
	public static void stonewalker(LivingUpdateEvent event) {
		// [...]
	}
}

So I don't know how to fix it.

Draco18s · August 6, 2018

Use the debugger to verify that that is what is null.

Animefan8888 · August 6, 2018

14 minutes ago, Enderlook said:

I'm quite sure the null may be `ModBlocks.BLOCK_PETRIFY_OBSIDIAN

I'm sure that it is the null instance that you are using as an entity that is null. Try using the player.

Edited August 6, 2018 by Animefan8888

Enderlook · August 6, 2018

31 minutes ago, Animefan8888 said:

I'm sure that it is the null instance that you are using as an entity that is null. Try using the player.

I'm not sure what you mean with "try using the player", but note that if I replace my block ModBlocks.PETRIFY_OBSIDIAN_BLOCK to Blocks.OBSIDIAN (I mean, a vanilla block) it works fine. That is why I think it may be a problem with the block.

39 minutes ago, Draco18s said:

Use the debugger to verify that that is what is null.

I'm sorry but I don't know how to use that IDE's tools, so I'll do my best. I've set a breakpoint in that line and open debug mode. It says:

event	LivingEvent$LivingUpdateEvent  (id=419)	
level	1	
entity	EntityPlayerMP  (id=424)	
entityLiving	EntityPlayerMP  (id=424)	
world	WorldServer  (id=431)	
r	3	
pos	BlockPos  (id=436)	
x	-1	
z	-2	
blockpos	BlockPos  (id=697)	
iblockstate	BlockStateContainer$StateImplementation  (id=440)

It seems that there isn't any null in that variables.

But...

If I add this line before the breakpoint:

BlockPetrifyObsidian a = ModBlocks.BLOCK_PETRIFY_OBSIDIAN;

I can see:

getMaterial() returned	MaterialLogic  (id=462)	
event	LivingEvent$LivingUpdateEvent  (id=418)	
level	1	
entity	EntityPlayerMP  (id=423)	
entityLiving	EntityPlayerMP  (id=423)	
world	WorldServer  (id=430)	
r	3	
pos	BlockPos  (id=435)	
x	-2	
z	-2	
blockpos	BlockPos  (id=438)	
iblockstate	BlockStateContainer$StateImplementation  (id=439)	
a	null

That "a" ---> my custom block, is null.

So, if both things (the block and the event) are registered automatically with "@SubscribeEvent", how can I ask Minecraft/Forge to initialize first the block and then the event? Or I don't know, whatever it must be done.

Animefan8888 · August 6, 2018

23 minutes ago, Enderlook said:

So, if both things (the block and the event) are registered automatically with "@SubscribeEvent", how can I ask Minecraft/Forge to initialize first the block and then the event? Or I don't know, whatever it must be done.

The yes it is obviously your block, and the problem may be that the string in your @ObjectHolder annotation doesn't match its registry name?

Enderlook · August 6, 2018

17 minutes ago, Animefan8888 said:

The yes it is obviously your block, and the problem may be that the string in your @ObjectHolder annotation doesn't match its registry name?

You have right, the registry name was different from the @ObjectHolder, I didn't know that. Thank you!

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My custom Frost Walker Enchantment doesn't recover the block after some time [solved]

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