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23 
24 /* @test
25    @key headful
26    @bug 6709913
27    @summary Verifies BasicComboBoxUI.isPopupVisible does not return NPE
28    @run main BasicComboNPE
29  */
30 import javax.swing.SwingUtilities;
31 import javax.swing.JComboBox;
32 import javax.swing.UIManager;
33 import javax.swing.UnsupportedLookAndFeelException;
34 import javax.swing.ComboBoxModel;
35 import java.awt.IllegalComponentStateException;
36 
37 public class BasicComboNPE extends JComboBox
38 {
main(String[] args)39     public static void main(String[] args) {
40         for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
41             try {
42                 System.out.println("Test for LookAndFeel " + laf.getClassName());
43                 UIManager.setLookAndFeel(laf.getClassName());
44                 new BasicComboNPE().getModel();
45             } catch (IllegalComponentStateException | ClassNotFoundException | InstantiationException |
46                      IllegalAccessException | UnsupportedLookAndFeelException e ) {
47                //System.out.println(e);
48             }
49         }
50 
51     }
52 
53     @Override
getModel()54     public ComboBoxModel getModel()
55     {
56         setPopupVisible(false);
57         isPopupVisible();
58         return super.getModel();
59     }
60 }
61