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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)