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  1. Minecraft: Java Edition
  2. MC-101228

Multiple hoppers pointing into each other causes crash for Batching chunks caused by ConcurrentModificationException

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    • Unconfirmed

      Note

      The exact reason why this happens is unknown. This bug cannot be reproduced in 1.9. This crash was first mentioned for a normal Survival world in this comment.

      The bug

      Having many hoppers pointing into each other crashes the game. This crash is caused by a java.util.ConcurrentModificationException (see attached crash report).

      How to reproduce

      Create a Superflat world with the preset

      3;minecraft:hopper:2;1;
      1.9.3-pre1
      Description: Batching chunks

java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at aht.a(SourceFile:1858)
	at ase.a(SourceFile:634)
	at aic.r(SourceFile:63)
	at bqb.b(SourceFile:160)
	at bpx.a(SourceFile:100)
	at bpx.run(SourceFile:43)
	at java.lang.Thread.run(Thread.java:745)

        1. crash-2016-04-23_20.30.17-client.txt
          3 kB
          [Mod] Marcono1234

            Unassigned Unassigned
            marcono1234 [Mod] Marcono1234
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              Created:
              Updated:
              Resolved: