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  1. Minecraft: Java Edition
  2. MC-149777

Crash when loading world: java.util.ConcurrentModificationException when using Java 11 or above

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    • Icon: Bug Bug
    • Resolution: Fixed
    • 21w20a
    • Minecraft 1.14, Minecraft 1.14.1 Pre-Release 1, 1.15.2, 20w13b, 20w15a, 20w21a, 1.16 Pre-release 8, 1.16.1, 20w28a, 20w29a, 1.16.4 Pre-release 2, 20w46a
    • None
    • Java 11 or newer
    • Confirmed
    • Crash
    • Very Important

      When attempting to play attached world in Minecraft client, game may crash, then freeze. Doesn't always happen. Crash report is only printed in launcher, not saved.

      java.util.ConcurrentModificationException
      	at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134)
      	at cje.b(SourceFile:67)
      	at cje.a(SourceFile:57)
      	at cff.a(SourceFile:98)
      	at cfi.a(SourceFile:86)
      	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$ReduceOp.evaluateSequential(ReduceOps.java:913)
      	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
      	at java.base/java.util.stream.IntPipeline.reduce(IntPipeline.java:496)
      	at java.base/java.util.stream.IntPipeline.max(IntPipeline.java:459)
      	at cfi.a(SourceFile:86)
      	at cfd$c.a(SourceFile:175)
      	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$ReduceOp.evaluateSequential(ReduceOps.java:913)
      	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
      	at java.base/java.util.stream.IntPipeline.reduce(IntPipeline.java:496)
      	at java.base/java.util.stream.IntPipeline.max(IntPipeline.java:459)
      	at cfd$c.a(SourceFile:176)
      	at cfd$c.<init>(SourceFile:98)
      	at cfd.a(SourceFile:280)
      	at cet.a(SourceFile:25)
      	at ces$a.a(SourceFile:89)
      	at bwy.a(SourceFile:187)
      	at bxc.d(SourceFile:44)
      	at bxc.a(SourceFile:199)
      	at us.a(SourceFile:461)
      	at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
      	at us.a(SourceFile:455)
      	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1072)
      	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478)
      	at uu.b(SourceFile:57)
      	at agk.e(SourceFile:83)
      	at agk.a(SourceFile:123)
      	at agk.run(SourceFile:91)
      	at java.base/java.util.concurrent.ForkJoinTask$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)
      

        1. documentary.zip
          311 kB
        2. crashreport.txt
          15 kB
        3. pre1.txt
          7 kB
        4. crash-2020-04-04_20.04.06-server.txt
          5 kB
        5. 20w21a_log.txt
          12 kB

            billy.sjoberg [Mojang] Billy Sjöberg
            laputan laputan
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            45 Vote for this issue
            Watchers:
            28 Start watching this issue

              Created:
              Updated:
              Resolved:
              CHK: