java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at javax.swing.plaf.basic.BasicComboBoxUI.setPopupVisible(BasicComboBoxUI.java:933)
at javax.swing.JComboBox.setPopupVisible(JComboBox.java:789)
at javax.swing.JComboBox.hidePopup(JComboBox.java:782)
at javax.swing.JComboBox$1.ancestorAdded(JComboBox.java:217)
at javax.swing.AncestorNotifier.fireAncestorAdded(AncestorNotifier.java:68)
at javax.swing.AncestorNotifier.propertyChange(AncestorNotifier.java:202)
at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:264)
at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:232)
at javax.swing.JComponent.firePropertyChange(JComponent.java:3801)
at javax.swing.JComponent.addNotify(JComponent.java:4271)
at java.awt.Container.addNotify(Container.java:1859)
at javax.swing.JComponent.addNotify(JComponent.java:4270)
at java.awt.Container.addNotify(Container.java:1859)
at javax.swing.JComponent.addNotify(JComponent.java:4270)
at java.awt.Container.addNotify(Container.java:1859)
at javax.swing.JComponent.addNotify(JComponent.java:4270)
at java.awt.Container.addNotify(Container.java:1859)
at javax.swing.JComponent.addNotify(JComponent.java:4270)
at java.awt.Container.addNotify(Container.java:1859)
at javax.swing.JComponent.addNotify(JComponent.java:4270)
at java.awt.Container.addNotify(Container.java:1859)
at javax.swing.JComponent.addNotify(JComponent.java:4270)
at java.awt.Container.addNotify(Container.java:1859)
at javax.swing.JComponent.addNotify(JComponent.java:4270)
at java.awt.Container.addNotify(Container.java:1859)
at javax.swing.JComponent.addNotify(JComponent.java:4270)
at java.awt.Container.addNotify(Container.java:1859)
at javax.swing.JComponent.addNotify(JComponent.java:4270)
at javax.swing.JRootPane.addNotify(JRootPane.java:658)
at java.awt.Container.addNotify(Container.java:1859)
at java.awt.Window.addNotify(Window.java:395)
at java.awt.Frame.addNotify(Frame.java:479)
at java.awt.Window.show(Window.java:433)
at java.awt.Component.show(Component.java:1128)
at java.awt.Component.setVisible(Component.java:1083)
at com.opone.jdm.JobDatabaseManager.(JobDatabaseManager.java:120)

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