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java.lang.NullPointerException: 	at undefined.inwardRecord.actionPerformed(inwardRecord.java:314)	at javax.swing.JComboBox.fireActionEvent(Unknown Source)	at javax.swing.JComboBox.contentsChanged(Unknown Source)	at javax.swing.AbstractListModel.fireContentsChanged(Unknown Source)	at javax.swing.DefaultComboBoxModel.setSelectedItem(Unknown Source)	at javax.swing.DefaultComboBoxModel.addElement(Unknown Source)	at javax.swing.JComboBox.addItem(Unknown Source)	at undefined.inwardRecord.(inwardRecord.java:265)	at undefined.inwardRecord.main(inwardRecord.java:296)