The test case below throws unexpected security exception when run with SecurityManager:

import java.awt.Dialog;
import java.awt.Frame;
import java.util.Timer;
import java.util.TimerTask;

/*
  @test
  @bug 7080109
  @summary Dialog.show() lacks doPrivileged() to access system event queue.
  @author ###@###.###: area=awt.dialog
  @run main/othervm/policy=java.policy -Djava.security.manager ModalDialogPermission
*/
public final class ModalDialogPermission {

    public static void main(final String[] args) {
        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
            @Override
            public void uncaughtException(final Thread t, final Throwable e) {
                throw new RuntimeException(e);
            }
        });
        final Frame frame = new Frame();
        final Dialog dialog = new Dialog(frame, "ModalDialog", true);
        final Timer t = new Timer();
        t.schedule(new TimerTask() {

            @Override
            public void run() {
                dialog.setVisible(false);
                dialog.dispose();
            }
        }, 3000L);
        dialog.show();
        frame.dispose();
        t.cancel();
    }
}

java.security.AccessControlException: access denied ("java.awt.AWTPermission" "replaceKeyboardFocusManager")
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:364)
    at java.security.AccessController.checkPermission(AccessController.java:555)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
    at java.awt.KeyboardFocusManager.checkReplaceKFMPermission(KeyboardFocusManager.java:3119)
    at java.awt.KeyboardFocusManager.setGlobalCurrentFocusCycleRoot(KeyboardFocusManager.java:1277)
    at java.awt.KeyboardFocusManager.setGlobalFocusOwner(KeyboardFocusManager.java:564)
    at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:524)
    at java.awt.Component.dispatchEventImpl(Component.java:4737)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Window.dispatchEventImpl(Window.java:2719)
    at java.awt.Component.dispatchEvent(Component.java:4691)
    at sun.awt.SunToolkit$3.run(SunToolkit.java:541)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:701)
    at java.awt.EventQueue.access$000(EventQueue.java:102)
    at java.awt.EventQueue$3.run(EventQueue.java:662)
    at java.awt.EventQueue$3.run(EventQueue.java:660)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:671)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:155)