[FIXED] AWT and Ubuntu 20 -> The system tray is not supported on the current platform

Issue

I am trying to run this solution (AWT System Tray to control a JavaFX application) on my Ubuntu 20.04.3 LTS. I tried with openjdk 14 and 17, result is the same:

Exception in thread "AWT-EventQueue-0" java.lang.UnsupportedOperationException: The system tray is not supported on the current platform.
    at java.desktop/java.awt.SystemTray.getSystemTray(SystemTray.java:188)
    at com.foo.fxtest1.JavaFxTest5.addAppToTray(JavaFxTest5.java:119)
    at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:771)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:716)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:741)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

Trying to solve the problem I found this answer: saying that Gnome 3.28 (used in Ubuntu 18.04) removed the System tray. I thought, that Ubuntu 20 didn't have a system tray, and that was the problem. However, in the top right corner of my screen I see the following:

.

As you see there are three application icons - Telegram, Viber and Alarm clock. As I understand these icons are shown in system tray, so system tray exists. Then what is the problem? Doesn't AWT support Ubuntu 20 system tray? Could anyone explain?

Solution

It is a bug in JDK. Issue is here.

Answered By - Pavel_K
Answer Checked By - Clifford M. (JavaFixing Volunteer)