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via Stack Overflow by Martyn
, 1 year ago
java.lang.NullPointerException: 	at biz.martyn.budget.CategoryComboBox.update(CategoryComboBox.java:24)	at biz.martyn.budget.CategoryComboBox.(CategoryComboBox.java:17)	at biz.martyn.budget.NewTransactionDialog.(NewTransactionDialog.java:36)	at biz.martyn.budget.TransactionsToolbar.(TransactionsToolbar.java:34)	at biz.martyn.budget.Budget.main(Budget.java:41)