Hi I'm building an application using a JTable to display data from a database and I keep getting an IndexOutOfBoundException from tableModel.getValueAt(row,col) during painting. I debugged the code and it seems like the data isn't being saved to the DefaultTableModels data vector.
This is my code...
public class TableFrame extends JFrame{
public static void main(String[] args){
TableFrame frame = new TableFrame();
}
private TablePanel tablePanel;
public TableFrame(){
super();
setSize(new Dimension(500,500));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
tablePanel = new TablePanel();
add(tablePanel);
updateLabels();
setVisible(true);
}
public void updateLabels() {
setTitle("Main Frame");
tablePanel.updateLabels();
}
private static class TablePanel extends JPanel{
private DefaultTableModel tableModel;
private DefaultTableColumnModel colModel;
private JTable table;
private JPanel buttonPanel;
private JButton refreshButton;
public TablePanel(){
setLayout(new BorderLayout());
buttonPanel = new JPanel(new FlowLayout());
refreshButton = new JButton();
refreshButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
refreshData();
}
});
buttonPanel.add(refreshButton);
add(buttonPanel,BorderLayout.NORTH);
//TODO:Set the column renderers and editors
colModel = new DefaultTableColumnModel();
colModel.addColumn(new TableColumn(0,75));
colModel.addColumn(new TableColumn(0,75));
colModel.addColumn(new TableColumn(0,75));
colModel.addColumn(new TableColumn(0,75));
colModel.addColumn(new TableColumn(0,75));
colModel.addColumn(new TableColumn(0,75));
colModel.addColumn(new TableColumn(0,75));
colModel.addColumn(new TableColumn(0,75));
colModel.addColumn(new TableColumn(0,75));
colModel.addColumn(new TableColumn(0,75));
colModel.addColumn(new TableColumn(0,75));
tableModel = new DefaultTableModel();
table = new JTable(tableModel,colModel);
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane,BorderLayout.CENTER);
updateLabels();
}
//This is going to query data from a database and populate the table
//problem occurs during painting
public void refreshData(){
Random rand = new Random();
for(int i=0;i<1000;i++){
Vector<Object> fields = new Vector<Object>();
for(int j=1;j<=11;j++){
fields.add(rand.nextInt());
}
tableModel.addRow(fields);
}
}
public void updateLabels() {
colModel.getColumn(0).setHeaderValue("Col 1");
colModel.getColumn(1).setHeaderValue("Col 2");
colModel.getColumn(2).setHeaderValue("Col 3");
colModel.getColumn(3).setHeaderValue("Col 4");
colModel.getColumn(4).setHeaderValue("Col 5");
colModel.getColumn(5).setHeaderValue("Col 6");
colModel.getColumn(6).setHeaderValue("Col 7");
colModel.getColumn(7).setHeaderValue("Col 8");
colModel.getColumn(8).setHeaderValue("Col 9");
colModel.getColumn(9).setHeaderValue("Col 10");
colModel.getColumn(10).setHeaderValue("Col 11");
refreshButton.setText("Refresh");
repaint();
}
}
}
This is the exception...
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
at java.util.Vector.elementAt(Vector.java:447)
at TableFrame$TablePanel.refreshData(TableFrame.java:108)
at TableFrame$TablePanel$1.actionPerformed(TableFrame.java:64)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2012)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2335)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:404)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6268)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6033)
at java.awt.Container.processEvent(Container.java:2045)
at java.awt.Component.dispatchEventImpl(Component.java:4629)
at java.awt.Container.dispatchEventImpl(Container.java:2103)
at java.awt.Component.dispatchEvent(Component.java:4455)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4633)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4297)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4227)
at java.awt.Container.dispatchEventImpl(Container.java:2089)
at java.awt.Window.dispatchEventImpl(Window.java:2517)
at java.awt.Component.dispatchEvent(Component.java:4455)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649)
at java.awt.EventQueue.access$000(EventQueue.java:96)
at java.awt.EventQueue$1.run(EventQueue.java:608)
at java.awt.EventQueue$1.run(EventQueue.java:606)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
at java.awt.EventQueue$2.run(EventQueue.java:622)
at java.awt.EventQueue$2.run(EventQueue.java:620)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
I debugged the code and added a call to tableModel.getDataVector().getElementAt(0).getElementAt(0) and tableModel.getRowCount(). getRowCount() returned 1000 but getElementAt() resulted in the IndexOutOfBounds exception, just like in the awt event queue. I think what I did should work but obviously there's something I'm missing.
