The javadoc for the java.awt.SystemTray.getTrayIconSize method states:

“Returns the size, *in pixels*, of the space that a tray icon will occupy in the system tray.”

It is not quite correct. On a High DPI screen with scale of 200%, the icon will be 32×32 on Windows. Yet the method always returns 16×16.

The scale of the main display on macOS isn't taken into account either.

The spec should be updated to clarify the size is user space / logical pixels.


A simple reproducer:
import java.awt.SystemTray;

public class SysTrayIconSize {
    public static void main(String[] args) {
        System.out.println(SystemTray.getSystemTray().getTrayIconSize());
    }
}