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Hi Eric,</div>
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As Gilles already said, initializing all classes at build time is something that cannot work for your use case. For AWT, a lot of class initializer call into native code to initialize OS state, and that state cannot be transferred from image build time to image
run time.</div>
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-Christian<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Gilles DUBOSCQ via GraalVM-Users <graalvm-users@oss.oracle.com><br>
<b>Sent:</b> Monday, October 16, 2023 11:10<br>
<b>To:</b> Eric Samson <erix.samson@gmail.com><br>
<b>Cc:</b> graalvm-users@oss.oracle.com <graalvm-users@oss.oracle.com><br>
<b>Subject:</b> Re: [graalvm-users] [External] : java.lang.Thread.sleep() supported in GraalVM?</font>
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It looks like the issue is not with Thread.sleep but Swing/AWT on Windows (specifically sun.awt.shell.Win32ShellFolderManager2$ComInvoker).</div>
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I think it's not a good idea to use --initialize-at-build-time, you're likely to get into a lot of such corner cases. In general only code that has been designed for it or has explicit support in native-image works well under --initialize-at-build-time. I would
recommend to use --initialize-at-build-time only on specific packages or type for which you know there is a real benefit.<br>
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If you really want to initialize everything at build time, maybe you can try to use --initialize-at-run-time=sun.awt.shell.Win32ShellFolder2</div>
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Gilles<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Eric Samson <erix.samson@gmail.com><br>
<b>Sent:</b> Monday, 16 October 2023 19:10<br>
<b>To:</b> Gilles DUBOSCQ <gilles.m.duboscq@oracle.com><br>
<b>Cc:</b> graalvm-users@oss.oracle.com <graalvm-users@oss.oracle.com><br>
<b>Subject:</b> Re: [External] : [graalvm-users] java.lang.Thread.sleep() supported in GraalVM?</font>
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Hi Gilles,</div>
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Thanks for the quick reply.</div>
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Here is the error message:</div>
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<b>Error</b>: Detected a started Thread in the image heap. Threads running in the image generator are no longer running at image runtime. To see how this object got instantiated use --trace-object-instantiation=java.lang.Thread. The object was probably created
by a class initializer and is reachable from a static field. You can request class initialization at image runtime by using the option --initialize-at-run-time=<class-name>. Or you can write your own initialization methods and call them explicitly from your
main entry point.<br>
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I've tried the option --initialize-at-runtime=java.lang.Thread, without success.</div>
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<b>StackTrace:</b></div>
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Trace: Object was reached by<br>
reading field java.util.concurrent.ThreadPoolExecutor$Worker.thread of constant<br>
java.util.concurrent.ThreadPoolExecutor$Worker@63a4cfd: java.util.concurrent.ThreadPoolExecutor$Worker@63a4cfd[State = 1, empty queue]<br>
reading field java.util.HashMap$Node.key of constant<br>
java.util.HashMap$Node@53798803: java.util.concurrent.ThreadPoolExecutor$Worker@63a4cfd[State = 1, empty queue]=j...<br>
indexing into array java.util.HashMap$Node[]@2f2400d: [Ljava.util.HashMap$Node;@2f2400d<br>
reading field java.util.HashMap.table of constant<br>
java.util.HashMap@1ac46e3c: {java.util.concurrent.ThreadPoolExecutor$Worker@63a4cfd[State = 1, empty queue]=...<br>
reading field java.util.HashSet.map of constant<br>
java.util.HashSet@74b3b357: [java.util.concurrent.ThreadPoolExecutor$Worker@63a4cfd[State = 1, empty queue]]<br>
reading field java.util.concurrent.ThreadPoolExecutor.workers of constant<br>
sun.awt.shell.Win32ShellFolderManager2$ComInvoker@7f227548: sun.awt.shell.Win32ShellFolderManager2$ComInvoker@7f227548[Running, pool size = ...<br>
scanning root sun.awt.shell.Win32ShellFolderManager2$ComInvoker@7f227548: sun.awt.shell.Win32ShellFolderManager2$ComInvoker@7f227548[Running, pool size = ... embedded in<br>
sun.awt.shell.ShellFolder.invoke(ShellFolder.java:537)<br>
parsing method sun.awt.shell.ShellFolder.invoke(ShellFolder.java:537) reachable via the parsing context<br>
at sun.awt.shell.Win32ShellFolder2.<init>(Win32ShellFolder2.java:292)<br>
at com.oracle.svm.core.code.FactoryMethodHolder.Win32ShellFolder2_constructor_79b7324abf2daa84de416777f746e499d5310ac3(generated:0)<br>
at sun.awt.shell.Win32ShellFolderManager2.getDesktop(Win32ShellFolderManager2.java:171)<br>
at sun.awt.shell.Win32ShellFolderManager2.isFileSystemRoot(Win32ShellFolderManager2.java:504)<br>
at javax.swing.filechooser.FileSystemView.isFileSystemRoot(FileSystemView.java:423)<br>
at javax.swing.filechooser.FileSystemView.getFiles(FileSystemView.java:581)<br>
at javax.swing.filechooser.FileSystemView.isParent(FileSystemView.java:338)<br>
at javax.swing.JFileChooser.setSelectedFile(JFileChooser.java:513)<br>
at javax.swing.JFileChooser.setFileFilter(JFileChooser.java:1472)<br>
at javax.swing.JFileChooser.setup(JFileChooser.java:398)<br>
at javax.swing.JFileChooser.<init>(JFileChooser.java:362)<br>
at com.oracle.svm.core.code.FactoryMethodHolder.JFileChooser_constructor_0980039f483e9a48b2389d8a4a1a9cd473a16dbd(generated:0)<br>
at javax.swing.text.html.FormView$BrowseFileAction.actionPerformed(FormView.java:968)<br>
at java.awt.MenuItem.processActionEvent(MenuItem.java:692)<br>
at java.awt.MenuItem.processEvent(MenuItem.java:651)<br>
at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:379)<br>
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)<br>
at java.awt.EventQueue$4.run(EventQueue.java:722)<br>
at java.awt.EventQueue$4.run(EventQueue.java:716)<br>
at com.oracle.svm.core.jdk.Target_java_security_AccessController.executePrivileged(SecuritySubstitutions.java:171)<br>
at sun.font.SunFontManager.<init>(SunFontManager.java:457)<br>
at sun.awt.Win32FontManager.<init>(Win32FontManager.java:88)<br>
at com.oracle.svm.core.code.FactoryMethodHolder.Win32FontManager_constructor_002b6104bcda27602265e5cec50c16a5ebc813af(generated:0)<br>
at static root method.(Unknown Source)<br>
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<b>My Groovy code snippet:</b></div>
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@groovy.transform.CompileStatic<br>
class App { <br>
static void main(String[] args) {<br>
// some very simple Swing UI init here</div>
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while (true) {<br>
time = LocalTime.now()<br>
label.text = " " + time.format("HH:mm:ss")<br>
Thread.sleep(1000)<br>
}<br>
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}</div>
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<b>My native-compile command line:</b></div>
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native-image --report-unsupported-elements-at-runtime --initialize-at-build-time --trace-class-initialization=java.lang.Thread --no-fallback -H:ConfigurationFileDirectories=conf/ -cp ".;%GROOVY_HOME%lib\groovy-4.0.9.jar;%GROOVY_HOME%lib\groovy-datetime-4.0.9.jar"
displaytime.App<br>
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<b>My native-agent command line (works well):</b></div>
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java -agentlib:native-image-agent=config-output-dir=conf/ displaytime.App<br>
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<div dir="ltr"><font size="2"><font color="#ff6600" face="tahoma, sans-serif"><b>::</b></font><font color="#3333ff" face="tahoma, sans-serif"> Cordialement<span class="x_x_gmail_default" style="font-family:tahoma,sans-serif; font-size:small; color:rgb(51,51,255)">/Best
regards</span>, Eri<span class="x_x_gmail_default" style="font-family:tahoma,sans-serif; font-size:small; color:rgb(51,51,255)">x</span></font></font>
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<div dir="ltr" class="x_x_gmail_attr">Le lun. 16 oct. 2023 à 18:48, Gilles DUBOSCQ <<a href="mailto:gilles.m.duboscq@oracle.com">gilles.m.duboscq@oracle.com</a>> a écrit :<br>
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Hi Eric,</div>
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Yes Thread.sleep() should work in GraalVM native-image.<br>
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It would help to know what kind of error you're seeing exactly.</div>
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Gilles<br>
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<div id="x_x_m_-9024239459165651314appendonsend"></div>
<hr style="display:inline-block; width:98%">
<div id="x_x_m_-9024239459165651314divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Eric Samson via GraalVM-Users <<a href="mailto:graalvm-users@oss.oracle.com" target="_blank">graalvm-users@oss.oracle.com</a>><br>
<b>Sent:</b> Monday, 16 October 2023 18:38<br>
<b>To:</b> <a href="mailto:graalvm-users@oss.oracle.com" target="_blank">graalvm-users@oss.oracle.com</a> <<a href="mailto:graalvm-users@oss.oracle.com" target="_blank">graalvm-users@oss.oracle.com</a>><br>
<b>Subject:</b> [External] : [graalvm-users] java.lang.Thread.sleep() supported in GraalVM?</font>
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<div style="border:0px; font-variant-numeric:inherit; font-variant-east-asian:inherit; font-variant-alternates:inherit; font-stretch:inherit; font-size:12pt; line-height:inherit; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-kerning:inherit; font-feature-settings:inherit; margin:0px; padding:0px; vertical-align:baseline; color:rgb(0,0,0)">
Hi everyone,</div>
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I'm totally new to GraalVM.</div>
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I've set up the whole environment for Windows this morning. </div>
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I'm now trying to natively compile a Groovy app (with neither dynamic nor meta programming).</div>
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I've been able to compile it and use the native-image-agent to generate the /conf files.</div>
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Now I'm trying to generate the executable and I get an error message due to the fact I'm using Thread.sleep(x) in my main loop.</div>
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Sleep is a static method of the Thread class. I understand there must be some kind of conflicts between the class being initialized at build-time or runtime. But I'm not sure how to fix it. I've spent a lot of time in the GraalVM documentation and several Web
sites (stackOverflow, etc.) but could not find a good example of how to use Thread.sleep in GraalVM.</div>
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Sorry for the noob question. Any hint would be greatly appreciated. Thanks in advance.</div>
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Best regards, Erix.</div>
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