Platform preferences detection doesn't pick up effective macOS system preferences if AWT owns the NSApplication and has set its NSAppearance to a fixed value.
The workaround is to set the system property "apple.awt.application.appearance=system". If this property is not set, the following warning will be emitted if a JavaFX application attempts to use the platform preferences API: WARNING: Reported preferences may not reflect the macOS system preferences unless the sytem property apple.awt.application.appearance=system is set. This warning can be disabled by setting javafx.preferences.suppressAppleAwtWarning=true. ------------- Commit messages: - Emit a warning on macOS if AWT has set the NSAppearance Changes: https://git.openjdk.org/jfx/pull/1367/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1367&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8325900 Stats: 53 lines in 4 files changed: 48 ins; 0 del; 5 mod Patch: https://git.openjdk.org/jfx/pull/1367.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1367/head:pull/1367 PR: https://git.openjdk.org/jfx/pull/1367
