Is your JTable really SAFE ????????

Question

when I grab the right most column end of the table and drag it to the left
something wierd happens...
I get all these exceptions and the table becomes useless
is there a way to block the user from making the size of the last column smaller by draging that column end to the left (Is it a bug in java????????)
thx
Exception occurred during event dispatching:
java.lang.ArrayIndexOutOfBoundsException: 4 >= 4 /* my table has 4 columns*/
     at java.util.Vector.elementAt(Vector.java:417)
     at javax.swing.table.DefaultTableColumnModel.getColumn(DefaultTableColumnModel.java:276)
     at javax.swing.JTable.accommodateDelta(JTable.java:2187)
     at javax.swing.JTable.columnMarginChanged(JTable.java:2906)
     at javax.swing.table.DefaultTableColumnModel.fireColumnMarginChanged(DefaultTableColumnModel.java:581)
     at javax.swing.table.DefaultTableColumnModel.propertyChange(DefaultTableColumnModel.java:620)
     at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:153)
     at javax.swing.table.TableColumn.firePropertyChange(TableColumn.java:242)
     at javax.swing.table.TableColumn.firePropertyChange(TableColumn.java:248)
     at javax.swing.table.TableColumn.setWidth(TableColumn.java:475)
     at javax.swing.plaf.basic.BasicTableHeaderUI$MouseInputHandler.mouseDragged(BasicTableHeaderUI.java:133)
     at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:260)
     at java.awt.Component.processMouseMotionEvent(Component.java:3761)
     at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:2377)
     at java.awt.Component.processEvent(Component.java:3550)
     at java.awt.Container.processEvent(Container.java:1167)
     at java.awt.Component.dispatchEventImpl(Component.java:2595)
     at java.awt.Container.dispatchEventImpl(Container.java:1216)
     at java.awt.Component.dispatchEvent(Component.java:2499)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2458)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2212)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2132)
     at java.awt.Container.dispatchEventImpl(Container.java:1203)
     at java.awt.Window.dispatchEventImpl(Window.java:918)
     at java.awt.Component.dispatchEvent(Component.java:2499)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:134)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:101)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)

Answer 1

Ive taken some of the functions out but these are the relevant functions
I think it happens on any table
just drag the right most column seperator (the after the last column) to the left as if your trying to
make the last column smaller by dragging its right end to the left
and then watch what happens
public class DraftsPanel extends JPanel
private JScrollPane draftsScrollPanel = new JScrollPane();
private DraftsTable draftsTable = new DraftsTable();
public DraftsPanel()
try
jbInit();
catch(Exception ex)
ex.printStackTrace();
void jbInit() throws Exception
draftsScrollPanel.setBounds(new Rectangle(4, 4, 225, 171));
draftsScrollPanel.setBorder(null);
draftsScrollPanel.setFont(new java.awt.Font("SansSerif", 0, 10));
draftsScrollPanel.setAutoscrolls(true);
draftsScrollPanel.getViewport().setBackground(Color.white);
this.setLayout(null);
draftsTable.setFont(new java.awt.Font("SansSerif", 0, 10));
this.setVisible(false);
this.add(draftsScrollPanel, null);
draftsScrollPanel.getViewport().add(draftsTable, null);
draftsTable.setAutoResizeMode(JTable.AUTO_RESIZE_NEXT_COLUMN);
draftsTable.setGridColor(new Color(177, 190, 255));
draftsTable.setShowVerticalLines(false);
this.add(draftsScrollPanel, null);
public DraftsTable getDraftsTable()
return draftsTable;
public class DraftsTable extends JTable
private DraftsTableModel draftsTableModel;
public DraftsTable()
try
jbInit();
catch(Exception ex)
ex.printStackTrace();
void jbInit() throws Exception
draftsTableModel = new DraftsTableModel();
setModel(draftsTableModel);
this.setEnabled(true);
getTableHeader().setFont(new java.awt.Font("SansSerif", 0, 10));
public class DraftsTableModel extends AbstractTableModel implements TableModelListener
private final String[] columnNames={"To","Subject","Composed"};
private DraftsMessageVector draftsMessageVector = new DraftsMessageVector();
private Object[][] data={};
public static final int TO_COLUMN = 0;
public static final int SUBJECT_COLUMN = 1;
public static final int COMPOSED_COLUMN = 2;
public DraftsTableModel()
updateData();
public int getColumnCount()
return columnNames.length;
public int getRowCount()
return data.length;
public String getColumnName(int col)
return columnNames[col];
public Object getValueAt(int row,int col)
return data[row][col];
public void setValueAt(String value,int row,int col)
public void updateData()
int dataLength = data.length;
int messageVectorLength = draftsMessageVector.length();
data = new Object[messageVectorLength][columnNames.length];
try
for(int i=0 ; i < messageVectorLength ; ++i)
data[i][TO_COLUMN] = draftsMessageVector.getMessage(i).getDestination();
data[i][SUBJECT_COLUMN] = draftsMessageVector.getMessage(i).getSubject();
data[i][COMPOSED_COLUMN] = draftsMessageVector.getMessage(i).getDate();
catch (Exception e)
System.err.println(e.getMessage());
finally
try
draftsMessageVector.saveToFile();
fireTableRowsInserted(messageVectorLength-1,messageVectorLength-1);
catch(Exception e)
System.err.println(e.getMessage());
public void tableChanged(TableModelEvent e)
}