I think it is not possible. The code related to this initialization is located in:
open/src/java.desktop/macosx/native/libawt_lwawt/awt/LWCToolkit.m

+ (void)starter:(BOOL)wasOnMainThread headless:(BOOL)headless {
........
........
if (forceEmbeddedMode) {
    AWT_STARTUP_LOG(@"in SWT or SWT/WebStart mode");

// Init a default NSApplication instance instead of the NSApplicationAWT.
    // Note that [NSApp isRunning] will return YES after that, though
    // this behavior isn't specified anywhere. We rely on that.
    NSApplicationLoad();
}

if (![app isRunning]) {
    AWT_STARTUP_LOG(@"+[AWTStarter startAWT]: ![app isRunning]");
    // This is where the AWT AppKit thread parks itself to process events.
        [NSApplicationAWT runAWTLoopWithApp: app];
    } else {
// Proceed to exit this call as there is no reason to run the NSApplication event loop.
.....

AWT skips initialization of AppKit if it was run using "-XstartOnFirstThread" option.

On 07/11/2017 07:39, Langer, Christoph wrote:
Hi,

I’ve got a question to the experts: I have a tool that launches the Eclipse Framework (with SWT). When I start the JVM on MacOSX, I (have to) set the option -XstartOnFirstThread. However, I want to do some work with AWT before launching Eclipse/SWT. But as the AWT NSLoop is not activated in that case, AWT stuff is not working. Is there any chance I can run the AWT NSLoop manually before Swing is active? Is that possible from within Java code? I don’t find this topic well documented…

Thanks in advance for any hints.

Best regards

Christoph



--
Best regards, Sergey.

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