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  1. Minecraft: Java Edition
  2. MC-184653

[Crash] "java.lang.IllegalArgumentException: value already present:" - Game crashes when worldgen dimension type presets are not unique

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Fixed
    • Affects Version/s: 20w21a, 20w22a, 1.16 Pre-release 2
    • Fix Version/s: 1.16 Pre-release 3
    • Labels:
      None
    • Environment:
    • Confirmation Status:
      Confirmed
    • Category:
      Crash
    • Mojang Priority:
      Very Important

      Description

      The bug

      When there are multiple dimensions with the same dimension type, the game crashes. When type is a string, it is supposedly a preset for dimension options like ultrawarm, shrunk, etc. However only one dimension can use the default values overworld, the_nether and the_end.

      How to reproduce

      1. Download the worldgen settings duplicate.json
      2. Create a new world and select the downloaded file when importing world settings
        The game crashes because the custom:overworld also used the overworld dimension type preset.

      Workaround

      Instead of using one of the presets, specify all the default properties like this:

      "type": {
        "ultrawarm": false,
        "natural": true,
        "shrunk": false,
        "ambient_light": 0,
        "has_skylight": true,
        "has_ceiling": false
      }

      Stack trace

      Description: Exception in server tick loop
       
      java.lang.IllegalArgumentException: value already present: chf@6204b89e
          at com.google.common.collect.HashBiMap.put(HashBiMap.java:287)
          at com.google.common.collect.HashBiMap.put(HashBiMap.java:262)
          at gg.a(SourceFile:51)
          at gg.a(SourceFile:62)
          at gl$a.a(SourceFile:28)
          at net.minecraft.server.MinecraftServer.a(SourceFile:407)
          at net.minecraft.server.MinecraftServer.i_(SourceFile:334)
          at enr.d(SourceFile:65)
          at net.minecraft.server.MinecraftServer.run(SourceFile:666)
          at java.lang.Thread.run(Thread.java:745)
      

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              Assignee:
              fry [Mojang] Georgii Gavrichev
              Reporter:
              MicherBugs Micher
              Votes:
              10 Vote for this issue
              Watchers:
              6 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:
                CHK: