A DESCRIPTION OF THE PROBLEM :
OS: win 10 (64bit)

Simply created a swing application with JFXPanel and WebView.

Deployment: Classpath

Added all jar files (except ..swt.jar) to classpath and copied all dlls to the same directory in the classpath.

Showing a web page with WebView/WebEngine stops the application without any jvm dumps or logs...

If I try the same application with openJFX 11.0.2, no crash

tried with openJDK 12 (32, 64 bit), openJDK 14 (64 bit)
same problem

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Simply use WebView

ACTUAL -
crash

---------- BEGIN SOURCE ----------
public class WebPreview extends JFXPanel
{
private WebEngine engine;

private String sURL;

public WebPreview()
{
Platform.setImplicitExit(false);
Platform.runLater(new Runnable()
{
            @Override
            public void run()
            {
                StackPane root = new StackPane();
                Scene scene = new Scene(root);
                
                WebView web = new WebView();
                
                engine = web.getEngine();

                root.getChildren().add(web);

                setScene(scene);
            }
       });
}

/**
* Sets the URL.
*
* @param pURL the URL
*/
public void setURL(String pURL)
{
sURL = pURL;

Platform.runLater(new Runnable()
{
            @Override
            public void run()
            {
engine.load(sURL);
            }
});
}

public String getURL()
{
return sURL;
}

}

Use above class in a swing application and set the URL property. I set the URL via Thread:
e.g.

Thread th = new Thread(new Runnable()
{
@Override
public void run()
{
browser.load(sServer + "/screen/web/ui/?Application.language=en" +
"&Application.WelcomeScreen=" + sScreenName +
"&Application.responsive.mini.width=" + (ResponsiveUtil.getMaxWidth(visionx.getLauncher(), LayoutMode.Mini) - 125) +
"&Application.responsive.small.width=" + (ResponsiveUtil.getMaxWidth(visionx.getLauncher(), LayoutMode.Small) - 125));
}
});
th.start();

---------- END SOURCE ----------

FREQUENCY : always