DefaultTableModel.getColumnName(int column) throws ArrayIndexOutOfBoundsException for column < 0.
By spec of DefaultTableModel:
  If columnIdentifiers does not have an entry for this index, returns the default name provided by the superclass.
And from AbstractTableModel.getColumnName(int column) description we have the following:
  If column cannot be found, returns an empty string.

So this method should return an empty string in this case without exceptions. This bug in RI should be fixed.
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