Sorry, that's may be not an issue, but just in case: should the AWT components be somehow (dynamically) scaled when using HiDPI?

Please compile/run the following simple test app. attached:
jdk/bin/java -Dswing.defaultlaf=com.sun.java.swing.plaf.gtGTKLookAndFeel -Dsun.java2d.uiScale=2 Mix

It seems (Ubuntu 15.04 + GNOME + HiDPI display) that "sun.java2d.uiScale" is used for both AWT and Swing components.

Please try to change scaling-factor, e.g.:
> gsettings set org.gnome.desktop.interface scaling-factor 3

the central (Swing) button's font is obviously changing, whereas for other (AWT) buttons - is not.

Such a behavior may cause some discordance for application containing both AWT + Swing components (mixing)

Another question, just in case. It seems that for Swing component we use scaling-factor multiplied by uiScale - is that what intended?

Checked with: JDK9 b93 and recent (Oct. 17) client build.