boolean isAppleOSX = System.getProperty("os.name").equals("Mac OS X");
if (isAppleOSX)) {
	//com.apple.concurrent.Dispatch.getInstance().getNonBlockingMainQueueExecutor().execute(threadRunner);
	Class<?> comAppleConcurrentDispatch = Class.forName("com.apple.concurrent.Dispatch");
	Method getInstance = comAppleConcurrentDispatch.getMethod("getInstance", (Class<?>[])null);
	Object dispatchInstance = getInstance.invoke(null,(Object[])null);
	Method getNonBlockingMainQueueExecutor = dispatchInstance.getClass().getMethod("getNonBlockingMainQueueExecutor", (Class<?>[])null);
	Executor executor = (Executor) getNonBlockingMainQueueExecutor.invoke(dispatchInstance, (Object[]) null);
	executor.execute(new Runnable() {
		public void run() {
			try {
				app.open();
			} catch (Throwable t) {
				// insert your error handling here
			}			
	});
} else {
	app.open();
}

        <resources os="Mac OS X" arch="x86_64">
                <property name="apple.laf.useScreenMenuBar" value="true"/>
                <property name="apple.awt.graphics.UseQuartz" value="true"/>
                <jar href="swt/swt-4.2.1-macosx-x86_64.jar" />
        </resources>

        <resources os="Mac OS X" arch="x86">
                <property name="apple.laf.useScreenMenuBar" value="true"/>
                <property name="apple.awt.graphics.UseQuartz" value="true"/>
                <jar href="swt/swt-4.2.1-macosx-x86.jar" />
        </resources>

if (SystemHelpers.isOSMac()) {
        private boolean isDisplayBuilt = false;
	try {
		try {
			Class<?> comAppleConcurrentDispatch = Class.forName("com.apple.concurrent.Dispatch");
			Method getInstance = comAppleConcurrentDispatch.getMethod("getInstance", (Class<?>[]) null);
			Object dispatchInstance = getInstance.invoke(null, (Object[]) null);
			Method getNonBlockingMainQueueExecutor = dispatchInstance.getClass().getMethod("getNonBlockingMainQueueExecutor",(Class<?>[]) null);
			Executor executor = (Executor) getNonBlockingMainQueueExecutor.invoke(dispatchInstance, (Object[]) null);
			executor.execute(new Runnable() {
				public void run() {
					try {
						if (display == null) {
							display = PlatformUI.createDisplay();
							PlatformUI.createAndRunWorkbench(display,
									new MyWorkbenchAdvisor()); //my implementation of WorkbenchAdvisor
							isDisplayBuilt = true;
						}
					} catch (Throwable t) {
						//log error
					}
				}
			});
		} catch (Throwable t) {
			//log error
		}

		SwingUtilities.invokeAndWait(new Runnable() {

			@Override
			public void run() {
				while (isDisplayBuilt == false) {
					try {
						Thread.sleep(100);
					} catch (InterruptedException e) {
						//log error
					}
				}
			}

		});

	} catch (Throwable t) {
		//log error
	}

(AppKit Thread) A org.eclipse.swt.SWTError object with a message of:
        org.eclipse.swt.SWTError: Not implemented (java.lang.ClassNotFoundException: apple.awt.CEmbeddedFrame)
was generated in the following call stack:
        at org.eclipse.swt.SWT.error(SWT.java:4109)
        at org.eclipse.swt.SWT.error(SWT.java:3998)
        at org.eclipse.swt.awt.SWT_AWT.new_Frame(SWT_AWT.java:145)
        at com.lspeed.workbench.AstoriaNavigatorWindowAdvisor.prepareModalFrame(AstoriaNavigatorWindowAdvisor.java:416)
        at com.lspeed.workbench.AstoriaNavigatorWindowAdvisor.createWindowContents(AstoriaNavigatorWindowAdvisor.java:325)
        at org.eclipse.ui.internal.WorkbenchWindow.createContents(WorkbenchWindow.java:1016)
        at org.eclipse.jface.window.Window.create(Window.java:431)
        at org.eclipse.ui.internal.Workbench$22.runWithException(Workbench.java:1208)
        at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
        at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
        at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
        at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3593)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3286)
        at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
        at org.eclipse.ui.internal.Workbench$31.runWithException(Workbench.java:1567)
        at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
        at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:179)
        at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)
        at org.eclipse.swt.widgets.Display.syncExec(Display.java:4240)
        at org.eclipse.ui.internal.StartupThreading.runWithoutExceptions(StartupThreading.java:94)
        at org.eclipse.ui.internal.Workbench.init(Workbench.java:1562)
        at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2567)
        at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
        at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
        at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
        at com.lspeed.workbench.AstoriaNavigatorApp$1.run(AstoriaNavigatorApp.java:84)
Caused by: java.lang.ClassNotFoundException: apple.awt.CEmbeddedFrame
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:264)
        at org.eclipse.swt.awt.SWT_AWT.new_Frame(SWT_AWT.java:140)
        ... 25 more
due to the following cause:

basic: DefaultMatchJRE: 
  JREDesc:    JREDesc[version 0+, heap=-1--1, args=null, sel=true, com.sun.javaws.jnl.ResourcesDesc@5956ca9f, null]
  JREInfo:    JREInfo for index 0:
    platform is: 1.7
    product is: 1.7.0_09
    location is: ht tp:// java.sun.com/products/autodl/j2se
    path is: /Library/Internet Plug-ins/JavaAppletPlugin.plugin/Contents/Home/bin/java
    args is: null
    native platform is: Mac OS X, x86_64 [ x86_64, 64bit ]
    JavaFX runtime is: JavaFX 2.2.3 found at /Library/Internet Plug-ins/JavaAppletPlugin.plugin/Contents/Home/
    enabled is: true
    registered is: true
    system is: true

  Init Heap:  -1
  Max  Heap:  67108864
  Satisfying: false, true
  SatisfyingVersion: true
  SatisfyingJVMArgs: false, true
  SatisfyingSecure: false
  Selected JVMParam: [JVMParameters: isSecure: false, args: -Dapple.laf.useScreenMenuBar=true -Dapple.awt.graphics.UseQuartz=true]
  Running  JVMParam: [JVMParameters: isSecure: true, args: ]
temp: Convert image: /Volumes/data/marvin/Library/Application Support/Oracle/Java/Deployment/cache/6.0/1/1dee1481-26720c99->/Volumes/data/user/Library/Application Support/Oracle/Java/Deployment/cache/6.0/1/1dee1481-26720c99.icns
basic: Saving session state to /var/folders/j_/403v_c_s3zzg5yrb2397fs240000gp/T/session7806841378132485821
================
basic: Launching new JRE version: JREInfo for index 0:   <---- LOOK for this!
    platform is: 1.7
    product is: 1.7.0_09
    location is: http:/ /java.sun.com/products/autodl/j2se
    path is: /Library/Internet Plug-ins/JavaAppletPlugin.plugin/Contents/Home/bin/java
    args is: null
    native platform is: Mac OS X, x86_64 [ x86_64, 64bit ]
    JavaFX runtime is: JavaFX 2.2.3 found at /Library/Internet Plug-ins/JavaAppletPlugin.plugin/Contents/Home/
    enabled is: true
    registered is: true
    system is: true

basic:   jvmParams: [JVMParameters: isSecure: false, args: -Dapple.laf.useScreenMenuBar=true -Dapple.awt.graphics.UseQuartz=true] <---- LOOK for this!

writeToLogFile("main() 0");
Executor executor = null;
String osName = System.getProperty("os.name");
writeToLogFile("main() 1 " + osName);
boolean isAppleOSX = osName.startsWith("Mac");
if (isAppleOSX) {
			//com.apple.concurrent.Dispatch.getInstance().getNonBlockingMainQueueExecutor().execute(threadRunner);
	try{
		Class<?> comAppleConcurrentDispatch = Class.forName("com.apple.concurrent.Dispatch");
		Method getInstance = comAppleConcurrentDispatch.getMethod("getInstance", (Class<?>[])null);
		Object dispatchInstance = getInstance.invoke(null,(Object[])null);
		Method getNonBlockingMainQueueExecutor = dispatchInstance.getClass().getMethod("getNonBlockingMainQueueExecutor", (Class<?>[])null);
		executor = (Executor) getNonBlockingMainQueueExecutor.invoke(dispatchInstance, (Object[]) null);
	}catch(Exception e){writeToLogFile("main() 1 " + e.toString());}
	writeToLogFile("main() 2");
	executor.execute(new Runnable() {
		public void run() {
			try {
				writeToLogFile("main() 3");
				runApp();
			} catch (Exception e) {
				writeToLogFile("main() 3 " + e.toString());
			}
		}
	});
writeToLogFile("main() 4");
} else {
	runApp();
}

import java.awt.Toolkit;
import java.lang.reflect.Method;
import java.util.concurrent.Callable;
import java.util.concurrent.Executor;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
import java.util.logging.ConsoleHandler;
import java.util.logging.FileHandler;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;

import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class SWTTest
{
  private static void log(final Object theMessage)
  {
    log(theMessage, null);
  }

  private static void log(final Object theMessage, final Throwable theError)
  {
    System.out.println("" + theMessage);
    if (theError != null)
      theError.printStackTrace(System.err);
    Logger.getLogger("webstart_test").log(Level.INFO, "" + theMessage, theError);
  }
  
  public static void main(String[] args)
    throws Exception
  {
    final Logger logger = Logger.getLogger("webstart_test");
    final FileHandler logfile = new FileHandler("%h/webstart_test.log");
    final ConsoleHandler console = new ConsoleHandler();
    logfile.setFormatter(new SimpleFormatter());
    console.setFormatter(new SimpleFormatter());
    logger.addHandler(logfile);
    logger.addHandler(console);
    log("start");
    String osName = System.getProperty("os.name");
    log("OS: " + osName);
    if (!osName.startsWith("Mac") && !osName.startsWith("Darwin"))
    {
      SWTTest.run();
    }
    else
    {
      try
      {
        Class<?> _c = Class.forName("com.apple.concurrent.Dispatch");
        final Method _get_instance = _c.getMethod("getInstance", null);
        final Object _instance = _get_instance.invoke(null, null);
        final Method _get_executor = _instance.getClass().getMethod("getNonBlockingMainQueueExecutor", null);
        final Executor _executor = (Executor) _get_executor.invoke(_instance, null);
        Toolkit.getDefaultToolkit();
        final FutureTask<Void> _f = new FutureTask<Void>(new Callable<Void>()
        {
          /**
           * {@inheritDoc}
           */
          @Override
          public Void call()
              throws Exception
          {
            log("Los gehts...");
            SWTTest.run();
            log("app fertig");
            return null;
          }
        });
        _executor.execute(_f);
        _f.get();
        TimeUnit.SECONDS.sleep(5);
        log("main fertig");
      }
      catch (final Throwable _e)
      {
        log(_e.getMessage(), _e);
      }
    }
  }
  
  private static void run()
  {
    try
    {
      log("creating display");
      final Display display = new Display();
      final Shell shell = new Shell(display);
      shell.setText("Hello, world!");
      shell.open();

      while (!shell.isDisposed())
      {
        if (!display.readAndDispatch())
          display.sleep();
      }

      display.dispose();
    }
    catch (Exception _e)
    {
      log(_e.getMessage(), _e);
    }
    finally
    {
      log("bye....");
    }
  }
}