ScribbleTAS
commented
3 years ago Well, for me I often had this issue... This came usually on multithreadding, often related to chunkloading, when a List is modified by 2 different threads at the same time... Thats as far as I understand it and it is probably related to the mod... Maybe something gets executed twice in a row, or saved on another thread?
mjtb49
Received the following crash report during testing today, unclear whether related to this mod.
---- Minecraft Crash Report ---- // You're mean.
Time: 6/20/21, 2:24 PM Description: Exception generating new chunk
java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at net.minecraft.structure.StructureManager.getStructure(StructureManager.java:56) at net.minecraft.structure.StructureManager.getStructureOrBlank(StructureManager.java:45) at com.mojang.datafixers.util.Either$Left.map(Either.java:38) at net.minecraft.structure.pool.SinglePoolElement.method_27233(SinglePoolElement.java:79) at net.minecraft.structure.pool.SinglePoolElement.getBoundingBox(SinglePoolElement.java:109) at net.minecraft.structure.pool.StructurePool.method_19310(StructurePool.java:74) at java.base/java.util.stream.ReferencePipeline$4$1.accept(ReferencePipeline.java:212) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.IntPipeline.reduce(IntPipeline.java:496) at java.base/java.util.stream.IntPipeline.max(IntPipeline.java:459) at net.minecraft.structure.pool.StructurePool.getHighestY(StructurePool.java:74) at net.minecraft.structure.pool.StructurePoolBasedGenerator$StructurePoolGenerator.method_19305(StructurePoolBasedGenerator.java:183) at java.base/java.util.stream.ReferencePipeline$4$1.accept(ReferencePipeline.java:212) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.IntPipeline.reduce(IntPipeline.java:496) at java.base/java.util.stream.IntPipeline.max(IntPipeline.java:459) at net.minecraft.structure.pool.StructurePoolBasedGenerator$StructurePoolGenerator.generatePiece(StructurePoolBasedGenerator.java:176) at net.minecraft.structure.pool.StructurePoolBasedGenerator$StructurePoolGenerator.method_27232(StructurePoolBasedGenerator.java:106) at net.minecraft.structure.pool.StructurePoolBasedGenerator.addPieces(StructurePoolBasedGenerator.java:70) at net.minecraft.structure.VillageGenerator.addPieces(VillageGenerator.java:25) at net.minecraft.world.gen.feature.VillageFeature$Start.init(VillageFeature.java:28) at net.minecraft.world.gen.feature.VillageFeature$Start.init(VillageFeature.java:23) at net.minecraft.world.gen.feature.StructureFeature.method_28657(StructureFeature.java:217) at net.minecraft.world.gen.feature.ConfiguredStructureFeature.method_28622(ConfiguredStructureFeature.java:29) at net.minecraft.world.gen.chunk.ChunkGenerator.method_28508(ChunkGenerator.java:253) at net.minecraft.world.gen.chunk.ChunkGenerator.setStructureStarts(ChunkGenerator.java:245) at net.minecraft.world.chunk.ChunkStatus.method_16556(ChunkStatus.java:181) at net.minecraft.world.chunk.ChunkStatus.runGenerationTask(ChunkStatus.java:135) at net.minecraft.server.world.ThreadedAnvilChunkStorage.method_17225(ThreadedAnvilChunkStorage.java:539) at com.mojang.datafixers.util.Either$Left.map(Either.java:38) at net.minecraft.server.world.ThreadedAnvilChunkStorage.method_17224(ThreadedAnvilChunkStorage.java:536) at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1072) at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) at net.minecraft.server.world.ChunkTaskPrioritySystem.method_17634(ChunkTaskPrioritySystem.java:43) at net.minecraft.util.thread.TaskExecutor.runNext(TaskExecutor.java:88) at net.minecraft.util.thread.TaskExecutor.runWhile(TaskExecutor.java:132) at net.minecraft.util.thread.TaskExecutor.run(TaskExecutor.java:100) at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1426) at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020) at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656) at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594) at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)
A detailed walkthrough of the error, its code path and all known details is as follows:
-- Head -- Thread: Server thread Stacktrace: at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at net.minecraft.structure.StructureManager.getStructure(StructureManager.java:56) at net.minecraft.structure.StructureManager.getStructureOrBlank(StructureManager.java:45) at com.mojang.datafixers.util.Either$Left.map(Either.java:38) at net.minecraft.structure.pool.SinglePoolElement.method_27233(SinglePoolElement.java:79) at net.minecraft.structure.pool.SinglePoolElement.getBoundingBox(SinglePoolElement.java:109) at net.minecraft.structure.pool.StructurePool.method_19310(StructurePool.java:74) at java.base/java.util.stream.ReferencePipeline$4$1.accept(ReferencePipeline.java:212) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.IntPipeline.reduce(IntPipeline.java:496) at java.base/java.util.stream.IntPipeline.max(IntPipeline.java:459) at net.minecraft.structure.pool.StructurePool.getHighestY(StructurePool.java:74) at net.minecraft.structure.pool.StructurePoolBasedGenerator$StructurePoolGenerator.method_19305(StructurePoolBasedGenerator.java:183) at java.base/java.util.stream.ReferencePipeline$4$1.accept(ReferencePipeline.java:212) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.IntPipeline.reduce(IntPipeline.java:496) at java.base/java.util.stream.IntPipeline.max(IntPipeline.java:459) at net.minecraft.structure.pool.StructurePoolBasedGenerator$StructurePoolGenerator.generatePiece(StructurePoolBasedGenerator.java:176) at net.minecraft.structure.pool.StructurePoolBasedGenerator$StructurePoolGenerator.method_27232(StructurePoolBasedGenerator.java:106) at net.minecraft.structure.pool.StructurePoolBasedGenerator.addPieces(StructurePoolBasedGenerator.java:70) at net.minecraft.structure.VillageGenerator.addPieces(VillageGenerator.java:25) at net.minecraft.world.gen.feature.VillageFeature$Start.init(VillageFeature.java:28) at net.minecraft.world.gen.feature.VillageFeature$Start.init(VillageFeature.java:23) at net.minecraft.world.gen.feature.StructureFeature.method_28657(StructureFeature.java:217) at net.minecraft.world.gen.feature.ConfiguredStructureFeature.method_28622(ConfiguredStructureFeature.java:29) at net.minecraft.world.gen.chunk.ChunkGenerator.method_28508(ChunkGenerator.java:253) at net.minecraft.world.gen.chunk.ChunkGenerator.setStructureStarts(ChunkGenerator.java:245) at net.minecraft.world.chunk.ChunkStatus.method_16556(ChunkStatus.java:181) at net.minecraft.world.chunk.ChunkStatus.runGenerationTask(ChunkStatus.java:135)
-- Chunk to be generated -- Details: Location: 17143,4 Position hash: 17179886327 Generator: net.minecraft.world.gen.chunk.SurfaceChunkGenerator@78502805 Stacktrace: at net.minecraft.server.world.ThreadedAnvilChunkStorage.method_17225(ThreadedAnvilChunkStorage.java:539) at com.mojang.datafixers.util.Either$Left.map(Either.java:38) at net.minecraft.server.world.ThreadedAnvilChunkStorage.method_17224(ThreadedAnvilChunkStorage.java:536) at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1072) at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) at net.minecraft.server.world.ChunkTaskPrioritySystem.method_17634(ChunkTaskPrioritySystem.java:43) at net.minecraft.util.thread.TaskExecutor.runNext(TaskExecutor.java:88) at net.minecraft.util.thread.TaskExecutor.runWhile(TaskExecutor.java:132) at net.minecraft.util.thread.TaskExecutor.run(TaskExecutor.java:100)
-- Affected level -- Details: All players: 1 total; [ServerPlayerEntity['Player31'/60, l='ServerLevel[New World]', x=274428.75, y=32.00, z=4.30]] Chunk stats: ServerChunkCache: 2946 Level dimension: minecraft:overworld Level spawn location: World: (48,64,-96), Chunk: (at 0,4,0 in 3,-6; contains blocks 48,0,-96 to 63,255,-81), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1) Level time: 202514 game time, 202514 day time Level name: New World Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true Level weather: Rain time: 48435 (now: false), thunder time: 90422 (now: false) Known server brands: fabric Level was modded: true Level storage version: 0x04ABD - Anvil Stacktrace: at net.minecraft.server.MinecraftServer.tickWorlds(MinecraftServer.java:873) at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:808) at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:82) at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:666) at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:226) at java.base/java.lang.Thread.run(Thread.java:834)
-- System Details -- Details: Minecraft Version: 1.16.1 Minecraft Version ID: 1.16.1 Operating System: Windows 10 (amd64) version 10.0 Java Version: 11, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 119811904 bytes (114 MB) / 570425344 bytes (544 MB) up to 4265607168 bytes (4068 MB) CPUs: 8 JVM Flags: 0 total; Player Count: 1 / 8; [ServerPlayerEntity['Player31'/60, l='ServerLevel[New World]', x=274428.75, y=32.00, z=4.30]] Data Packs: vanilla Type: Integrated Server (map_client.txt) Is Modded: Definitely; Client brand changed to 'fabric'