Uploaded image for project: 'Minecraft: Java Edition'
  1. Minecraft: Java Edition
  2. MC-149777

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

    XMLWordPrintable

    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Fixed
    • Affects Version/s: 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
    • Fix Version/s: 21w20a
    • Labels:
      None
    • Environment:
      Java 11 or newer
    • Confirmation Status:
      Confirmed
    • Category:
      Crash
    • Mojang Priority:
      Very Important

      Description

      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)
      

        Attachments

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

          Issue Links

            Activity

              People

              Assignee:
              billy.sjoberg [Mojang] Billy Sjöberg
              Reporter:
              laputan laputan
              Votes:
              45 Vote for this issue
              Watchers:
              29 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:
                CHK: