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

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via Oracle Community by 807595, 1 year ago
This exception has no message.
java.lang.NullPointerException	at QuestionEditor$1.itemStateChanged(QuestionEditor.java:240)	at javax.swing.JComboBox.fireItemStateChanged(JComboBox.java:1162)	at javax.swing.JComboBox.selectedItemChanged(JComboBox.java:1219)	at javax.swing.JComboBox.contentsChanged(JComboBox.java:1266)	at javax.swing.AbstractListModel.fireContentsChanged(AbstractListModel.java:100)	at javax.swing.DefaultComboBoxModel.setSelectedItem(DefaultComboBoxModel.java:88)	at javax.swing.DefaultComboBoxModel.addElement(DefaultComboBoxModel.java:126)	at javax.swing.JComboBox.addItem(JComboBox.java:690)	at QuestionEditor.getJComboBox(QuestionEditor.java:247)	at QuestionEditor.getJContentPane(QuestionEditor.java:132)	at QuestionEditor.initialize(QuestionEditor.java:114)	at QuestionEditor.<init>(QuestionEditor.java:51)	at Alypaa.<init>(Alypaa.java:18)	at Alypaa.main(Alypaa.java:25)