Mac OS X: Problems with custom widget in JTable

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hello,

I am using a simple "graph widget" (a subclass of JComponent that
overrides the paint() method) as a cell renderer in a simple
JTable.

This works fine on Linux and Windows (you see the /\ /\ in each cell),
but on Mac OS X (also with Java 1.6) the cells are empty (just plain
white window).

A minimal example that shows this behavior is attached.
Do you have any ideas?

Thanks in advance!
--
Felix Natter

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Content-Type: text/x-java
Content-Disposition: inline; filename=TestJTable5.java

import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

class AlignmentStatisticsRenderWidget extends JComponent {
    private double[] col_significance;

    public void paint(Graphics g) {
        int cellLeftPadding = 7;
        int cellBottomPadding = 5;
        int colwidth = 10;
        int colheight = 15;
        for (int i = 1; i < col_significance.length; i++) {
            g.drawLine(cellLeftPadding + (i-1)*colwidth, (int)(col_significance[i-1]*colheight)+cellBottomPadding, cellLeftPadding + i*colwidth, (int)(col_significance[i]*colheight)+cellBottomPadding);
        }
    }

    public AlignmentStatisticsRenderWidget(double[] col_significance) {
        this.col_significance = col_significance;
    }
}

class MyDataModel extends AbstractTableModel {
    private Object[][] data;
    private Object[] column;
    public int getColumnCount() { return column.length; }
    public int getRowCount() { return data.length; }
    public String getColumnName(int col) {
        return (String)column[col];
    }
    public Object getValueAt(int row, int col) {
        // this gets called all the time!
        System.out.println("getValueAt("+row+","+col+")");
        return data[row][col];
    }
    public void setValueAt(Object obj, int row, int col) {
        data[row][col] = obj;
    }
    public boolean CellEditable(int row, int col) {
        return true;
    }
    public MyDataModel() {
        data = new Object[][]{
            { "a","","","","",""},
            { "","b","","","",""},
            { "","","c","","",""},
            { "","","","d","",""},
            { "","","","","e",""},
            { "","","","","","f"}};
        column = new Object[]{"A","B","C","D","E","F"};
    }

}

class MyJTable extends JTable implements TableCellRenderer {
    
    public TableCellRenderer getCellRenderer(int r, int c) {
        return this;
    }
    
    public Component getTableCellRendererComponent(JTable table, Object value,
                                                   boolean isSelected, boolean hasFocus, int row, int column) {
        //return new JLabel(String.format("%d/%d", row, column));
        double[] values = {1.0, 0.0, 1.0, 0.0, 1.0};
        AlignmentStatisticsRenderWidget w = new AlignmentStatisticsRenderWidget(values);
        return w;
    }

    public MyJTable(TableModel tm) {
        super(tm);
    }
}

public class TestJTable5 extends JFrame {
    JTable dataTable;
    MyDataModel datamodel;
    JScrollPane tblSP;

    public TestJTable5() {
        setSize(320,240);

        datamodel = new MyDataModel();
        dataTable = new MyJTable(datamodel);
        dataTable.setAutoCreateRowSorter(true);
        dataTable.setVisible(true);
        add(dataTable);
        setVisible(true);
    }

    public static void main(String[] args) {
        TestJTable5 frame = new TestJTable5();
        frame.addWindowListener( new WindowAdapter() {
                public void windowClosing( WindowEvent e ) {
                    System.exit(0);
                }
            });
        //frame.pack();
        frame.setVisible(true);
    }
    
}
/*
  Local Variables:
  compile-command: "make run"
  End:
*/

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