GitHub user matthiasblaesing added a comment to the discussion: Windows
clipboard issues discussion
This might be an option:
```java
package eu.doppelhelix.test.clipboardreproducer;
import java.awt.Toolkit;
import java.awt.datatransfer.FlavorEvent;
import java.awt.datatransfer.FlavorListener;
import java.awt.datatransfer.StringSelection;
import java.lang.System.Logger;
import java.lang.System.Logger.Level;
import javax.swing.SwingUtilities;
public class Clipboardreproducer {
private static final Logger LOG =
System.getLogger(Clipboardreproducer.class.getName());
public static void main(String[] args) throws InterruptedException {
SwingUtilities.invokeLater(() -> {
Toolkit.getDefaultToolkit().getSystemClipboard().addFlavorListener(new
FlavorListener() {
@Override
public void flavorsChanged(FlavorEvent e) {
LOG.log(Level.INFO, "Flavor Changed: {0} // {1}", e,
SwingUtilities.isEventDispatchThread());
}
});
});
// Copy operation one: copy from EDT
Runnable copy = new Runnable() {
public void run() {
try {
Toolkit.getDefaultToolkit().getSystemClipboard().setContents(new
StringSelection("Test"), null);
LOG.log(Level.INFO, "Copy 1");
} catch (IllegalStateException ex) {
LOG.log(Level.ERROR, "Failed to invoke copy (1)", ex);
}
SwingUtilities.invokeLater(this);
}
};
SwingUtilities.invokeLater(copy);
// Copy operation two: Simulate secondary source
new Thread() {
@Override
public void run() {
while (true) {
try {
Toolkit.getDefaultToolkit().getSystemClipboard().setContents(new
StringSelection("Test"), null);
LOG.log(Level.INFO, "Copy 2");
} catch (IllegalStateException ex) {
LOG.log(Level.ERROR, "Failed to invoke copy (2)", ex);
}
}
}
}.start();
Thread.sleep(60 * 1000);
}
}
```
With a JDK built with assertions enabled (fastdebug), this reliably gets me the
assertion. The underlying problem is the same, two threads enter the critical
region (call between `openClipboard` and `closeClipboard` together).
GitHub link:
https://github.com/apache/netbeans/discussions/7051#discussioncomment-12742018
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