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java.lang.UnsupportedOperationException: 	at java.util.AbstractList.add(AbstractList.java:131)	at java.util.AbstractList.add(AbstractList.java:91)	at org.yccheok.jstock.gui.StockDatabaseJDialog$StockInfoTableModel.addNewStockInfo(StockDatabaseJDialog.java:769)	at org.yccheok.jstock.gui.StockDatabaseJDialog.addNewStockInfo(StockDatabaseJDialog.java:481)	at org.yccheok.jstock.gui.StockDatabaseJDialog.access$1500(StockDatabaseJDialog.java:71)	at org.yccheok.jstock.gui.StockDatabaseJDialog$8.update(StockDatabaseJDialog.java:528)	at org.yccheok.jstock.gui.StockDatabaseJDialog$8.update(StockDatabaseJDialog.java:486)	at org.yccheok.jstock.engine.Subject.notify(Subject.java:46)	at org.yccheok.jstock.gui.AjaxAutoCompleteJComboBox$SubjectEx.notify(AjaxAutoCompleteJComboBox.java:64)	at org.yccheok.jstock.gui.AjaxAutoCompleteJComboBox$1.actionPerformed(AjaxAutoCompleteJComboBox.java:154)	at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1240)	at javax.swing.JComboBox.setSelectedItem(JComboBox.java:567)	at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:603)	at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(BasicComboPopup.java:817)	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:273)	at java.awt.Component.processMouseEvent(Component.java:6289)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)	at javax.swing.plaf.basic.BasicComboPopup$1.processMouseEvent(BasicComboPopup.java:481)	at java.awt.Component.processEvent(Component.java:6054)	at java.awt.Container.processEvent(Container.java:2041)	at java.awt.Component.dispatchEventImpl(Component.java:4652)	at java.awt.Container.dispatchEventImpl(Container.java:2099)	at java.awt.Component.dispatchEvent(Component.java:4482)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)	at java.awt.Container.dispatchEventImpl(Container.java:2085)	at java.awt.Window.dispatchEventImpl(Window.java:2478)	at java.awt.Component.dispatchEvent(Component.java:4482)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)	at java.awt.EventQueue.access$000(EventQueue.java:85)	at java.awt.EventQueue$1.run(EventQueue.java:603)	at java.awt.EventQueue$1.run(EventQueue.java:601)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)	at java.awt.EventQueue$2.run(EventQueue.java:617)	at java.awt.EventQueue$2.run(EventQueue.java:615)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)	at java.awt.Dialog$1.run(Dialog.java:1046)	at java.awt.Dialog$3.run(Dialog.java:1098)	at java.security.AccessController.doPrivileged(Native Method)	at java.awt.Dialog.show(Dialog.java:1096)	at java.awt.Component.show(Component.java:1585)	at java.awt.Component.setVisible(Component.java:1537)	at java.awt.Window.setVisible(Window.java:842)	at java.awt.Dialog.setVisible(Dialog.java:986)	at org.yccheok.jstock.gui.MainFrame.jMenuItem8ActionPerformed(MainFrame.java:1106)	at org.yccheok.jstock.gui.MainFrame.access$2100(MainFrame.java:67)	at org.yccheok.jstock.gui.MainFrame$15.actionPerformed(MainFrame.java:617)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)	at javax.swing.AbstractButton.doClick(AbstractButton.java:357)	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:809)	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:850)	at java.awt.Component.processMouseEvent(Component.java:6289)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)	at java.awt.Component.processEvent(Component.java:6054)	at java.awt.Container.processEvent(Container.java:2041)	at java.awt.Component.dispatchEventImpl(Component.java:4652)	at java.awt.Container.dispatchEventImpl(Container.java:2099)	at java.awt.Component.dispatchEvent(Component.java:4482)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)	at java.awt.Container.dispatchEventImpl(Container.java:2085)	at java.awt.Window.dispatchEventImpl(Window.java:2478)	at java.awt.Component.dispatchEvent(Component.java:4482)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)	at java.awt.EventQueue.access$000(EventQueue.java:85)	at java.awt.EventQueue$1.run(EventQueue.java:603)	at java.awt.EventQueue$1.run(EventQueue.java:601)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)	at java.awt.EventQueue$2.run(EventQueue.java:617)	at java.awt.EventQueue$2.run(EventQueue.java:615)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)