Keepass2 puts incorrect atom in clipboard targets list

On copying a password or entry into a clipboard Keepass2 puts an atom with id of zero into a list of formats. This makes it impossible to paste from Keepass2 into any Java program.

Following is a simple Java program which attempts to print clipboard content:
=== ClipRead.java ===
import java.awt.*;
import java.awt.datatransfer.*;

public class ClipRead {
  public static void main(String... args) throws Exception {
    Toolkit toolkit = Toolkit.getDefaultToolkit();
    Clipboard clipboard = toolkit.getSystemClipboard();
    Object data = clipboard.getData(DataFlavor.stringFlavor);
    System.out.println("[" + data + "]");
  }
}
=== ClipRead.java ===

Calling it after copying from Keepass2 results in a following exception:
$ java ClipRead
Atom was 0
Exception in thread "main" java.lang.NullPointerException: Failed to retrieve atom name.
 at sun.awt.X11.XlibWrapper.XGetAtomName(Native Method)
 at sun.awt.X11.XAtom.getName(XAtom.java:186)
 at sun.awt.X11.XDataTransferer.getTargetNameForAtom(XDataTransferer.java:164)
 at sun.awt.X11.XDataTransferer.getNativeForFormat(XDataTransferer.java:153)
 at sun.awt.datatransfer.DataTransferer.getFlavorsForFormats(DataTransferer.java:735)
 at sun.awt.datatransfer.SunClipboard.getData(SunClipboard.java:218)
 at ClipRead.main(ClipRead.java:8)

Expected result:
$ java ClipRead
[my password]