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Bug
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Resolution: Fixed
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Minor
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None
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None
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The server is running on a Windows 10 computer with Java 16.
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This server is running CraftBukkit version 3158-Spigot-f773da8-470050a (MC: 1.17) (Implementing API version 1.17-R0.1-SNAPSHOT)
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Yes
When one is taking advantage of the Spigot/Bukkit API to use a custom world generator, you need to create a ChunkGenerator with an @override method generateChunkData that returns an instance of ChunkData however you want it to be.
If one tries to set a block inside the ChunkData instance to that of a block with an inventory associated with it such as a chest, ender chest, shulker box etc, by something along the lines of chunkData.setBlock(x, y, z, Material.CHEST) the following error is produced:
java.lang.ClassCastException: class net.minecraft.world.level.block.state.IBlockData cannot be cast to class net.minecraft.world.level.block.ITileEntity (net.minecraft.world.level.block.state.IBlockData and net.minecraft.world.level.block.ITileEntity are in unnamed module of loader 'app') at org.bukkit.craftbukkit.v1_17_R1.generator.CustomChunkGenerator.buildBase(CustomChunkGenerator.java:157) at net.minecraft.world.level.chunk.ChunkStatus.lambda$6(ChunkStatus.java:77) at net.minecraft.world.level.chunk.ChunkStatus$d.doWork(ChunkStatus.java:265) at net.minecraft.world.level.chunk.ChunkStatus.a(ChunkStatus.java:212) at net.minecraft.server.level.PlayerChunkMap.lambda$25(PlayerChunkMap.java:611) at com.mojang.datafixers.util.Either$Left.map(Either.java:38) at net.minecraft.server.level.PlayerChunkMap.lambda$24(PlayerChunkMap.java:609) at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146) at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) at net.minecraft.server.level.ChunkTaskQueueSorter.b(SourceFile:58) at net.minecraft.util.thread.ThreadedMailbox.f(SourceFile:91) at net.minecraft.util.thread.ThreadedMailbox.a(SourceFile:131) at net.minecraft.util.thread.ThreadedMailbox.run(SourceFile:99) at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1434) at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:295) at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016) at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665) at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598) at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) A detailed walkthrough of the error, its code path and all known details is as follows: ----------------------------------------------------------------------------------------- Head -- Thread: Server thread Stacktrace: at org.bukkit.craftbukkit.v1_17_R1.generator.CustomChunkGenerator.buildBase(CustomChunkGenerator.java:157) at net.minecraft.world.level.chunk.ChunkStatus.lambda$6(ChunkStatus.java:77) at net.minecraft.world.level.chunk.ChunkStatus$d.doWork(ChunkStatus.java:265) at net.minecraft.world.level.chunk.ChunkStatus.a(ChunkStatus.java:212)-- Chunk to be generated -- Details: Location: 2,2 Position hash: 8589934594 Generator: org.bukkit.craftbukkit.v1_17_R1.generator.CustomChunkGenerator@4587463e Stacktrace: at net.minecraft.server.level.PlayerChunkMap.lambda$25(PlayerChunkMap.java:611) at com.mojang.datafixers.util.Either$Left.map(Either.java:38) at net.minecraft.server.level.PlayerChunkMap.lambda$24(PlayerChunkMap.java:609) at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146) at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) at net.minecraft.server.level.ChunkTaskQueueSorter.b(SourceFile:58) at net.minecraft.util.thread.ThreadedMailbox.f(SourceFile:91) at net.minecraft.util.thread.ThreadedMailbox.a(SourceFile:131) at net.minecraft.util.thread.ThreadedMailbox.run(SourceFile:99)
This error does not occur on any other Minecraft versions that I have tested, nor does it occur for any other materials without inventories that I have tested. It seems to be an inventory-block related problem.
Apologies if this isn't a bug, I did search through all the changes between 1.16.5 and 1.17 that could explain this but I could not find anything.
