ADDITIONAL SYSTEM INFORMATION :
Linux

A DESCRIPTION OF THE PROBLEM :
Press PrintScreen key, then call Clipboard.getContents(null). You can find that it would cost 20 seconds.

REGRESSION : Last worked in version 8u281

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1, Press PrintScreen key.
2, Then call Clipboard.getContents(null)


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
 Hope that cost time would less than 1 seconds.
ACTUAL -
You can find that it would cost 20 seconds.

---------- BEGIN SOURCE ----------
package taishan;

import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;

public final class PrintScreenTest
{

public static void main(String[] args)
{
long startTime = System.currentTimeMillis();

Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
clipboard.getContents(null);

//After PrintScreen key pressed, cost time is about 20 seconds.
System.out.println("cost time="+(System.currentTimeMillis()-startTime));
}

}

---------- END SOURCE ----------

FREQUENCY : always