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  1. Minecraft: Java Edition
  2. MC-132663

Command blocks kick player when entering certain commands > 256 characters in multiplayer

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Fixed
    • Affects Version/s: Minecraft 1.13-pre6, Minecraft 1.13-pre8, Minecraft 1.13
    • Fix Version/s: Minecraft 18w30a
    • Environment:

      Java 1.8.0_51 64 Bit
      3072MB Memory Allocated
      CPU: AMD fx-8350 8 core @4.0GHz
      GPU: AMD RX 480 8GB

      Win10 Enterprise N v1803

      Multiplayer only

    • Confirmation Status:
      Confirmed

      Description

      The bug

      While entering certain commands in a command block on a multiplayer server the client is kicked:

      Internal Exception: io.netty.handler.codec.DecoderException: The received string length is longer than maximum allowed (265 > 256)
      

      Apparently not every string causes this, for example 32500 * "a", or /say with a similar large text works fine.

      How to reproduce

      1. Enter the following command
        execute if entity @e[type=!minecraft:player,name=Apprentice,tag=!Apprentice] as @e[type=!minecraft:player,name=Apprentice,tag=!Apprentice] at @s run advancement grant @p[distance=..10] only elkia:starwars/sithapprenticeaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
        
      2. Place the cursor right behind the last character ("e") type a character, for example another "a"

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              • Assignee:
                boq [Mojang] Bartosz Bok
                Reporter:
                caoimhin10 Caoimhin Doyle
              • Votes:
                8 Vote for this issue
                Watchers:
                7 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved:
                  CHK: