How to merge cell in DefaultTableModel/JTable?

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MultiSpanCellTableExample demonstrates how to merge cells by creating a custom TableUI. There seem to be a problem in this example that causes StackOverflowError, at least in Java 6. To fix this, inside AttributiveCellTableModel.setDataVector() replace: 

setColumnIdentifiers(columnNames);

with: 

this.columnIdentifiers = columnNames;

IE: 

public void setDataVector(Vector newData, Vector columnNames) {
    if (newData == null)
        throw new IllegalArgumentException(
                "setDataVector() - Null parameter");
    dataVector = new Vector(0);
    // setColumnIdentifiers(columnNames);
    this.columnIdentifiers = columnNames;
    dataVector = newData;

    cellAtt = new DefaultCellAttribute(dataVector.size(),
            columnIdentifiers.size());

    newRowsAdded(new TableModelEvent(this, 0, getRowCount() - 1,
            TableModelEvent.ALL_COLUMNS, TableModelEvent.INSERT));
}

The problem is that setColumnIdentifiers calls into setDataVector hence triggering the StackOverflowError. Once fixed, this is how the example looks like:

enter image description here

There is also a ready solution from JIDE, unfortunately it is not free. Here is for example CellSpanTable:

enter image description here

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