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copied!<p>Clearly, your main method is not being executed on the main thread. You can see in the stack trace that the launcher is actually started in another thread, and then the <code>Launcher</code> only indirectly calls <code>main</code>. This is unfortunately just the diagnostic, I am not sure about the solution. I have done a similar thing (SWT app through Java Web Start), but I can't remember how we solved this, if at all.</p> <p>After checking the <a href="http://javasourcecode.org/html/open-source/jdk/jdk-6u23/com/sun/javaws/Launcher.java.html" rel="nofollow">com.sun.javaws.Launcher</a> source code, it is quite unclear how this could be made to work. The <code>Launcher.launch</code> method starts a new thread within which your <code>main</code> method is executed. You can follow the code to recreate the exact stacktrace you are getting.</p> <p>The <a href="http://javasourcecode.org/html/open-source/jdk/jdk-6u23/com/sun/javaws/Main.java.html#line.67" rel="nofollow">main entry point</a> of Java Web Start shows that the main thread dies soon after starting.</p> <h2>Update</h2> <p>I dug something out: in <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=288436" rel="nofollow">this Eclipse bug report</a> it is suggested that the problem could be related to this:</p> <pre><code><resources> <j2se version="1.4+" /> <jar href="client.jar" /> </resources> </code></pre> <p>The parser takes the j2se spec from here and ignores the later, more specific ones. Try removing the <code><j2se...</code> line.</p> <h2>Update 2</h2> <p>Now I dug this up from <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=303869" rel="nofollow">here</a>:</p> <pre><code>com.apple.concurrent.Dispatch.getInstance().getNonBlockingMainQueueExecutor().execute( new Runnable() { public void run() { final Display display = Display.getDefault(); while (!display.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } }); </code></pre> <p>This actually sounds like something workable. It does exactly what I described in my comment below: patches into the main thread through a mechanism specifically put in place for this purpose. Try to adapt this to your need. You may not even need -XstartOnFirstThread with this.</p> <h2>Update 3</h2> <p>I finally found my old SWT-JWS project. It's got this in it:</p> <pre><code><resources os="Mac OS X" arch="x86_64"> <j2se version="1.6+" java-vm-args="-XstartOnFirstThread"/> <jar href="swt-cocoa-macosx-x86-64-3.6.2.jar" /> </resources> </code></pre> <p>and it works. It has no default <code>j2se</code> element, this element appears <strong>only</strong> in the OSX-specific entry.</p>

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