Entity tracking error on entity spawn

coulis · November 3, 2020, 2:08am

I’m trying to save an armorstand entity and then duplicating it somewhere else. To achieve that, I’m saving an EntitySnapshot. Then, when executing the paste command, it get a copy of the snapshot and restore it and then spawn the entity on the player’s location.

I keep getting some type of entity tracking error :

[15:38:56] [Server thread/INFO] [nucleus]: COWLISSE ran the command: /astcopy
[15:39:01] [Server thread/INFO] [nucleus]: COWLISSE ran the command: /astpaste
[15:39:01] [Server thread/ERROR] [minecraft/EntityTracker]: "Silently" catching entity tracking error.
net.minecraft.util.ReportedException: Adding entity to track
        at net.minecraft.entity.EntityTracker.func_72785_a(EntityTracker.java:256) [ol.class:?]
        at net.minecraft.entity.EntityTracker.func_72786_a(EntityTracker.java:193) [ol.class:?]
        at net.minecraft.world.ServerWorldEventHandler.func_72703_a(ServerWorldEventHandler.java:37) [op.class:?]
        at net.minecraft.world.World.func_72923_a(World.java:1222) [amu.class:?]
        at net.minecraft.world.WorldServer.func_72923_a(WorldServer.java:1112) [oo.class:?]
        at net.minecraft.world.WorldServer.impl$forceSpawnEntity(WorldServer.java:4887) [oo.class:?]
        at net.minecraft.world.WorldServer.bridge$forceSpawnEntity(WorldServer.java:4867) [oo.class:?]
        at org.spongepowered.common.entity.EntityUtil.processEntitySpawn(EntityUtil.java:744) [EntityUtil.class:1.12.2-2838-7.2.2-RC0]
        at org.spongepowered.common.event.tracking.PhaseTracker.spawnEntityWithCause(PhaseTracker.java:1155) [spongeforge-1.12.2-2838-7.2.2-RC0.jar:1.12.2-2838-7.2.2-RC0]
        at net.minecraft.world.WorldServer.spawnEntity(WorldServer.java:1838) [oo.class:?]
        at ca.coulis.armorstandcopy.AstPaste.execute(AstPaste.java:41) [AstPaste.class:?]
        at org.spongepowered.api.command.spec.CommandSpec.process(CommandSpec.java:388) [CommandSpec.class:1.12.2-2838-7.2.2-RC0]
        at org.spongepowered.common.command.SpongeCommandDispatcher.process(SpongeCommandDispatcher.java:355) [SpongeCommandDispatcher.class:1.12.2-2838-7.2.2-RC0]
        at org.spongepowered.common.command.SpongeCommandManager.process(SpongeCommandManager.java:360) [SpongeCommandManager.class:1.12.2-2838-7.2.2-RC0]
        at net.minecraft.command.ServerCommandManager.func_71556_a(SourceFile:665) [dh.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:962) [pa.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:941) [pa.class:?]
        at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:37) [la.class:?]
        at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:9) [la.class:?]
        at org.spongepowered.common.event.tracking.phase.packet.PacketPhaseUtil.onProcessPacket(PacketPhaseUtil.java:219) [PacketPhaseUtil.class:1.12.2-2838-7.2.2-RC0]
        at net.minecraft.network.PacketThreadUtil$1.redirect$zla000$impl$redirectToPhaseTracker(SourceFile:540) [hv$1.class:?]
        at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [hv$1.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_261]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_261]
        at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
        at org.spongepowered.common.SpongeImplHooks.onUtilRunTask(SpongeImplHooks.java:308) [SpongeImplHooks.class:1.12.2-2838-7.2.2-RC0]
        at net.minecraft.server.MinecraftServer.redirect$zje000$onRun(MinecraftServer.java:4682) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_261]
Caused by: java.lang.IllegalStateException: Entity EntityArmorStand['George'/186, l='world', x=62.92, y=66.00, z=229.14] is already tracked for world: world
        at net.minecraft.entity.EntityTracker.redirect$zeg000$impl$reportEntityAlreadyTrackedWithWorld(EntityTracker.java:1063) ~[ol.class:?]
        at net.minecraft.entity.EntityTracker.func_72785_a(EntityTracker.java:224) ~[ol.class:?]
        ... 31 more

I have tried spawning the entity and specifying the cause of spawn as documented in the docs but I still get the same error.

MoseMister · November 3, 2020, 6:24am

Hi.
EntitySnapshot is used to create a restore the same entity (this means the uuid of the entity will be the same as well as everything else.

Try using EntityArchetype. This is used for creating a common state for creating multiple entities as well as saving the state of an entity. The EntityArchetype doesn’t come with the location nor anything tracking related, just the values that make the entity look like that entity

coulis · November 4, 2020, 6:41pm

Thanks for the answer, it looks conclusive, but now I’m encountering IllegalStateException when I try to, from my new entity, copyFrom(ast) my EntityArchetype. I’ve tried other ways such as copyFrom(ast.copy()) setRawData(ast.getEntityData()).

Here is the error log :

Here is my code :

coulis · November 4, 2020, 8:01pm

Asked on Discord, it’s a SpongeCommon error