GitHub user xxDark edited a comment on the discussion: Windows clipboard issues
discussion
Modify my test as follows, this will be 1:1 of what is happening in NetBeans:
```
import java.awt.EventQueue;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import java.util.UUID;
public class ClipboardTest {
public static void main(String[] args) throws Exception {
var clipboard =
Toolkit.getDefaultToolkit().getSystemClipboard();
// Comment out to "fix" the bug.
clipboard.addFlavorListener(e -> {
//Dummy listener.
});
EventQueue.invokeLater(() -> {
// Dummy task.
});
for (var thread : Thread.getAllStackTraces().keySet()) {
var name = thread.getName();
if (name.contains("AWT")) {
System.out.printf("%s is running%n", name);
}
}
var r = new Runnable() {
final ClipboardContent content = new ClipboardContent();
State state = new State.SetContent();
int iteration;
@Override
public void run() {
try {
switch (state) {
case State.SetContent ignored
-> {
var current =
this.content;
var owner =
current.owner;
owner.lost = false;
try {
clipboard.setContents(current.selection, owner);
} catch
(IllegalStateException ex) {
return;
}
state = new
State.CheckOwnership(System.currentTimeMillis() + 7000L);
}
case State.CheckOwnership state
-> {
if (content.owner.lost)
{
// OK
this.state =
new State.SetContent();
iteration++;
} else if
(System.currentTimeMillis() > state.deadline) {
System.err.printf("Ownership should've been lost (failed at %d iterations)%n",
iteration);
this.state =
new State.CheckOwnership(Long.MAX_VALUE);
Thread.ofPlatform().start(() -> {
do {
try {
System.out.println(clipboard.getContents(null).getTransferData(DataFlavor.stringFlavor));
} catch (UnsupportedFlavorException | IOException e) {
e.printStackTrace();
}
try {
Thread.sleep(1000L);
} catch (InterruptedException ignored) {}
} while
(true);
});
}
}
}
} finally {
EventQueue.invokeLater(this);
}
}
};
EventQueue.invokeLater(r);
Thread.sleep(60000L);
System.out.printf("Did %d iterations%n", r.iteration);
Runtime.getRuntime().halt(0);
}
private sealed interface State {
record SetContent() implements State {
}
record CheckOwnership(long deadline) implements State {
}
}
private static final class ClipboardContent {
final OwnershipTracker owner = new OwnershipTracker();
final String content = UUID.randomUUID().toString();
final StringSelection selection = new StringSelection(content);
}
private static final class OwnershipTracker implements ClipboardOwner {
volatile boolean lost;
@Override
public void lostOwnership(Clipboard clipboard, Transferable
contents) {
lost = true;
}
}
}
```
When you see "Ownership should've been lost" message, try copying something
from another application. `getContents` will now be returning bogus data.
Previous steps still apply: hold ctrl+C in the code area till the "ownership
should've been lost" message appears
GitHub link:
https://github.com/apache/netbeans/discussions/7051#discussioncomment-12768814
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