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java.lang.NullPointerException at 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 inwardRecord.<init>(inwardRecord.java:265) at inwardRecord.main(inwardRecord.java:296)