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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)