The following bug was found when fixing 6302514 after assigning a null parent to print/pag dialogs, the null-parent dialogs are found to be unblocked. FileDialog and Print/Page Dialogs both uses Window peers and share modality-related code.

import java.awt.*;
import java.awt.event.*;

public class FileDialogTest {

    public static void main(String[] args) {
        final Dialog td = new Dialog((Frame) null, "Toolkit modal dialog",
                               Dialog.ModalityType.TOOLKIT_MODAL);
        td.setLayout(new FlowLayout());^M
    ^M
    Button printbtn2 = new Button("File Dialog");^M
        ^M
    printbtn2.addActionListener(new ActionListener() {^M
    public void actionPerformed(ActionEvent event) {^M
        //FileDialog jd = new FileDialog(td, "FileDialog Test"); ^M
        FileDialog jd = new FileDialog((Dialog)null, "FileDialog Test"); ^M
        jd.show();^M
            }^M
    });^M
    td.add(printbtn2);^M

        td.setSize(250, 150);
        td.setVisible(true);
    }
}