Booleans not rendering as JCheckBoxes in JTable

Question

I've read several posts on trying to get JCheckBoxes to render in a JTable, and I've looked at the Tables tutorial, but I still can't figure out why my JTable isn't rendering Booleans as check-boxes. :-(
I thought rendering check-boxes was the the default behavior for cells with Boolean values. This doesn't seem to be the case. I can add a cell editor of type JCheckBox by simply instantiating a new DefaultCellEditor, but adding a cell renderer doesn't look so easy (I believe I have to create my own implementation class). I was trying to avoid that, because a) I'm working in Servoy (which means I'm working in a Rhino editor and need to access my own custom classes as plugins or beans), and b) my Java skills are weak.
So can anybody see anything about my code that is obviously wrong? Or do I have to roll up my sleeves and write my own DefaultTableCellRenderer bean/plugin?
Here's my code (remember - it's javascript instances of java objects). (Note: I'm not sure exactly what kinds of objects JSDataSet.getAsTableModel() returns to the JTable model, but creating my own JTable with a vector of vectors of Boolean objects, or setting a Boolean in the cell after the fact doesn't work either.)
Any tips would be greatly appreciated.
// convert dataset into JTable
var table = elements.monitoring;
table.model = treatments.getAsTableModel();
// modify column headers
var columns = table.columnModel;
columns.getColumn(0).setHeaderValue('Quantity');
columns.getColumn(0).setPreferredWidth(60);
columns.getColumn(1).setHeaderValue('Repeats/hr.');
columns.getColumn(1).setPreferredWidth(75);
columns.getColumn(2).setHeaderValue('TREATMENT');
columns.getColumn(2).setPreferredWidth(225);
// start treatment times at 8am
var j=8;
for (i=3;i<44;++i) {
     var j_int = Packages.java.lang.Integer(j);
     columns.getColumn(i).setHeaderValue(j_int);
     columns.getColumn(i).setPreferredWidth(10);
     if (j == 12) {
          j=0;
     ++j;
// center cell data
var cell_class = Packages.java.lang.String;
var table_renderer = table.getDefaultRenderer(cell_class);
table_renderer.setHorizontalAlignment(0);
// add JTable to JScrollPane viewport (necessary to display headers)
var viewport = elements.monitoring_pane.viewport;
viewport.add(table);

Answer 1

Ok, another problem -
I wound up throwing out the Rhino constructor method and implementing my own JTable class and importing it into the Rhino scope. I had to do that because I needed columns to render different types of objects - basically, the table cells should appear blank until they are selected and data is added to them, at which point they should be Boolean and render check-boxes - I got that to work by overriding the getCellRenderer method.
The problem is, I need to add some logic to the 'onClick' event for the table cell, so that I can add a blank check box, add a checked check box, or remove a check box. I looked at the Table tutorial and tried to do it by implementing the TableModelListener interface on my JTable and defining the tableChanged method. However, when I add the tableChanged method to my class, I get an ArrayIndexOutOfBoundsException.
Any tips would be greatly appreciated.
I instantiate the class in Rhino and add the TableModelListener like so:
var table = new Packages.my_classes.MyJTable();
table.model = model; // a working model defined elsewhere
table.getModel().addTableModelListener(table);Here's my class:
package my_classes;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;
public class MyJTable extends JTable implements TableModelListener {
     public TableCellRenderer getCellRenderer(int row, int column) {
          Object value = getValueAt(row,column);
            if (value == null) {
                 return getDefaultRenderer(JCheckBox.class);
            return super.getCellRenderer(row,column);
     public Class getColumnClass(int column) {
          if (column > 2) {
               return Boolean.class;
          } else {
               return Object.class;
     public void tableChanged(TableModelEvent e) {
          int row = e.getFirstRow();
          int column = e.getColumn();
          TableModel model = (TableModel) e.getSource();
          String columnName = model.getColumnName(column);
          Object data = model.getValueAt(row, column);
}