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  1. Minecraft Launcher
  2. MCL-5441

Empty profile directory causes launcher to pass malformed start arguments to Minecraft


    • Plausible

      Affected version: 2.0.757 (Windows)

      The bug

      The launcher passes malformed start arguments to Minecraft when you leave the profile directory empty. Such an empty profile directory value can be created using MCL-5440.
      The passed arguments are invalid because Minecraft fails loading the assets and instead creates an folder called -assetsDir (which is the argument key for the assets folder name) in the %appdata%\.minecraft folder.

      Additionally the launcher prints a malformed log:

      [0123/125946:INFO:GameCallbacks.cpp(161)] game/game () error Completely ignored arguments: [C:/Users\###\AppData\Roaming\.minecraft/assets]
        <log4j:Event logger="bzn" timestamp="1485172786913" level="ERROR" thread="Client thread">
          <log4j:Message><![CDATA[Can't find the resource index file: --assetsDir\assets\indexes\1.11.json]]></log4j:Message>
      [0123/125946:INFO:GameCallbacks.cpp(161)] launcher/monitor (Process Monitor) error expected <

      And the Game Output window seems to handle that many log line very bad while they are being printed. Only updating when you click somewhere.

      How to reproduce

      Important: This creates malformed folders and might corrupt files in the %appdata%\.minecraft folder.

      1. Use MCL-5440 to get a profile with an empty profile directory
      2. Start Minecraft with this profile

            Unassigned Unassigned
            marcono1234 Marcono1234
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