SystemTray.get() blocks ~60 s on Pop OS 22.04 then falls back to GtkStatusIcon

[Nikola352]

On Pop!_OS 22.04 (GNOME 42, x11), SystemTray.get() takes approximately 60 seconds to return. After the delay, the tray falls back to GtkStatusIcon.

If an SLF4J provider is on the classpath, the following error log can be seen:

ERROR SystemTray - GNOME shell detected, but UNKNOWN type. This should never happen. Falling back to GtkStatusIcon. Please create an issue with as many details as possible.

Environment

Dorkbox SystemTray Version	4.4
OS	Pop!_OS 22.04 LTS x86_64
Kernel	6.17.4-76061704-generic
DE	GNOME 42.9
WM	Mutter (x11)
WM Theme	Pop
JVM	Amazon Corretto 21 (reproduced on others as well)
XDG_CURRENT_DESKTOP	pop:GNOME
XDG_SESSION_TYPE	x11
gnome-shell-extension-appindicator	installed

Minimal reproduction

import dorkbox.systemTray.SystemTray;
                                                                                                                                               
public class Main {
    public static void main(String[] args) {                                                                                                   
        long t0 = System.currentTimeMillis();
        SystemTray tray = SystemTray.get();
        System.out.printf("SystemTray.get() returned in %d ms: %s%n",                                                                          
                System.currentTimeMillis() - t0,
                tray == null ? "null" : tray.getClass().getName());                                                                            
        if (tray != null) tray.shutdown();
    }                                                                                                                                          
}               

With SLF4J + Log4j on the classpath: prints the UNKNOWN type error, returns after ~60s.

Workaround

Calling libayatana-appindicator3 directly via JNA (bypassing Dorkbox detection) works correctly and initialises instantly on the same machine, confirming the library and extension are functional.

Expected behaviour

SystemTray.get() should detect the AppIndicator environment and return promptly, or at minimum not block for 60 seconds before falling back.