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java.lang.ClassCastException: 	at javax.swing.table.DefaultTableModel.justifyRows(DefaultTableModel.java:238)	at javax.swing.table.DefaultTableModel.setDataVector(DefaultTableModel.java:194)	at javax.swing.table.DefaultTableModel.(DefaultTableModel.java:131)	at javax.swing.JTable.(JTable.java:403)	at NetNegotiator.makeTable(NetNegotiator.java:187)	at NetNegotiator.(NetNegotiator.java:246)	at NetNegotiator.main(NetNegotiator.java:349)