Java version problems

ATLauncher Instances Fail to Load on Java 16+ (InaccessibleObjectException: java.awt.Color.value)

What the log looks like

java\.lang\.reflect\.InaccessibleObjectException: Unable to make field int java\.awt\.Color\.value accessible: module java\.desktop does not "opens java\.awt"

How to fix it

  1. Update ATLauncher to the latest version—if the built-in updater does not run, download the newest ATLauncher installer from atlauncher.com and install it over your existing folder so it uses its bundled Java runtime and updated Gson adapter.
  2. If you run a standalone ATLauncher.jar file, install Java 8 or Java 11 and configure your system or shortcut to launch ATLauncher with that older Java version instead of Java 16+ (you can still select Java 16/17/21 inside ATLauncher settings for Minecraft itself).
  3. If you must run an older launcher JAR on Java 16 or newer via a startup script, add --add-opens=java.desktop/java.awt=ALL-UNNAMED to the java command before -jar.
LoadersVanilla, Forge, Neoforge, Fabric, Quilt
SeverityBreaks something
CategoryJava version problems

Check your own log

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