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POInvalid Thread Access even with XstartOnFirstThread in vm args
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  1. POInvalid Thread Access even with XstartOnFirstThread in vm args
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    copied!<p>I have an embryonic Java Web Start application with a single class. It runs on Windows and Linux but gets the dreaded Invalid Thread Access error on Mac OS X. I realise that this has been dealt with elsewhere. I have spent two full days scouring the Internet and have implemented all the solutions, but the problem persists.</p> <p>My understanding is that calls to SWT must be made from the main thread which is the case here. Correct me if I am wrong in that.</p> <p>I will post 3 snippets below, the source code of the application, the relevant part of the jnlp file and the error message on the Mac. The question is at the end.</p> <hr> <p>JAVA SOURCE CODE</p> <pre><code>package client; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class AccountWindow { public static void main(String[] args) { Display display = new Display(); **// error occurs here** Shell shell = new Shell(display); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } } </code></pre> <hr> <p>JNLP SNIPPET</p> <pre><code>&lt;resources os="Mac\ OS\ X" arch="x86_64"&gt; &lt;j2se version="1.5+" java-vm-args="-XstartOnFirstThread" /&gt; &lt;nativelib href="swt-4.2-cocoa-macosx-x86_64.jar" /&gt; &lt;/resources&gt; </code></pre> <hr> <p>ERROR MESSAGE</p> <pre><code>org.eclipse.swt.SWTException: Invalid thread access at org.eclipse.swt.SWT.error(Unknown Source) at org.eclipse.swt.SWT.error(Unknown Source) at org.eclipse.swt.SWT.error(Unknown Source) at org.eclipse.swt.widgets.Display.error(Unknown Source) at org.eclipse.swt.widgets.Display.createDisplay(Unknown Source) at org.eclipse.swt.widgets.Display.create(Unknown Source) at org.eclipse.swt.graphics.Device.&lt;init&gt;(Unknown Source) at org.eclipse.swt.widgets.Display.&lt;init&gt;(Unknown Source) at org.eclipse.swt.widgets.Display.&lt;init&gt;(Unknown Source) at client.AccountWindow.main(AccountWindow.java:16) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.javaws.Launcher.executeApplication(Launcher.java:1550) at com.sun.javaws.Launcher.executeMainClass(Launcher.java:1488) at com.sun.javaws.Launcher.doLaunchApp(Launcher.java:1299) at com.sun.javaws.Launcher.run(Launcher.java:114) at java.lang.Thread.run(Thread.java:637) </code></pre> <hr> <p>PLEASE NOTE<br/> - The display.syncExec solution posted at <a href="http://www.eclipse.org/swt/faq.php#javawebstart" rel="nofollow">http://www.eclipse.org/swt/faq.php#javawebstart</a> is not applicable because before you can invoke it you need a display. The error here happens when I try to create the display.<br/> - I have used JaNeLa to validate the jnlp file and there are no red errors.<br/> - &LT;resources os="Mac\ OS\ X" arch="i386"&GT; is being correctly interpreted because the correct swt library is being loaded.<br/> - You can reproduce the error at <a href="http://thelinkjuicer.com/gannonline/client.jnlp" rel="nofollow">http://thelinkjuicer.com/gannonline/client.jnlp</a><br/></p> <hr> <p>AND NOW THE QUESTION<br/> Can anyone see anything in the source code or the jnlp snippet that would cause the error?<br/> Secondary question: how can you tell if the -XstartOnFirstThread argument is actually being read by the VM?</p>
 

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