GeezerVison is showing github.com — Fix "InaccessibleObjectException" exception on Linux startup by neobrain · Pull Request #1559 · processing/processing4
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neobrain
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Aug 3, 2026
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Linux builds would previously throw this error on startup:
java.lang.reflect.InaccessibleObjectException: Unable to make field private
static java.lang.String sun.awt.X11.XToolkit.awtAppClassName accessible:
module java.desktop does not "opens sun.awt.X11" to unnamed module @4c8aea9c
The code that triggered this in Processing itself documented that an --add-opens parameter must be used, but this was never applied in the gradle build. This now matches the --add-opens parameter used in build/linux/processing.
Comment from LinuxPlatform.java:
// Set X11 WM_CLASS property which is used as the application
// name by Gnome 3 and other window managers.
// processing/processing#2534
// For Java 17, this hack requires an addition to the command line:
// --add-opens=java.desktop/sun.awt.X11=ALL-UNNAMED
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Linux builds would previously throw this error on startup:
> java.lang.reflect.InaccessibleObjectException: Unable to make field private
> static java.lang.String sun.awt.X11.XToolkit.awtAppClassName accessible:
> module java.desktop does not "opens sun.awt.X11" to unnamed module @4c8aea9c
The code that triggered this in Processing itself documented that an
`--add-opens` parameter must be used, but this was never applied in the
gradle build.
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amazing, thank you for fixing this @neobrain !
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catilac
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