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  1. Minecraft: Java Edition
  2. MC-125069

18w06a crash: Exception generating new chunk: java.util.concurrent.ExecutionException: java.lang.ClassCastException: axc cannot be cast to azb

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • None
    • Minecraft 18w06a
    • None
    • Unconfirmed

      The bug

      The game can crash with the attached crash report when for example creating a superflat world with the preset below:

      minecraft:stone,minecraft:sand,2*minecraft:air,minecraft:stone;2;biome_1,decoration
      

      Crash report

      Description: Exception generating new chunk
      
      java.util.concurrent.ExecutionException: java.lang.ClassCastException: axc cannot be cast to azb
      	at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2237)
      	at rz.c(SourceFile:130)
      	at atm.c(SourceFile:311)
      	at atm.p(SourceFile:307)
      	at atm.b(SourceFile:718)
      	at atm.c(SourceFile:247)
      	at atm.l(SourceFile:231)
      	at bho.b(SourceFile:61)
      	at sa.b(SourceFile:824)
      	at sa.a(SourceFile:760)
      	at cvl.a(SourceFile:98)
      	at cvl.d(SourceFile:131)
      	at net.minecraft.server.MinecraftServer.run(SourceFile:503)
      	at java.lang.Thread.run(Thread.java:745)
      Caused by: java.lang.ClassCastException: axc cannot be cast to azb
      	at sf.f(SourceFile:169)
      	at bpl.a(SourceFile:221)
      	at bpl.b(SourceFile:175)
      	at bpl.a(SourceFile:171)
      	at boo.a(SourceFile:63)
      	at bpa.a(SourceFile:57)
      	at bly.a(SourceFile:92)
      	at bny.a(SourceFile:16)
      	at bny.a(SourceFile:13)
      	at bit.a(SourceFile:27)
      	at aud.a(SourceFile:416)
      	at bhz.b(SourceFile:142)
      	at sn.a(SourceFile:13)
      	at sm.a(SourceFile:34)
      	at bgq.a(SourceFile:89)
      	at sr.a(SourceFile:54)
      	at sr.a(SourceFile:23)
      	at zo$a.a(SourceFile:143)
      	at zo$a$$Lambda$875/621712682.apply(Unknown Source)
      	at java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501)
      	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
      	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902)
      	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689)
      	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644)
      	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
      

            Unassigned Unassigned
            miwob [Mod] Michael Wobst
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              Created:
              Updated:
              Resolved: