When JTable.setTableHeader(JTableHeader) is called, the resulting table will not display the new header. The problem is that the JTableHeader requires a TableColumModel to get the column data and its not set anywhere in the call or event chain.

There could be a potential memory leak as the reference to the previous column model is not freed when the previous JTableHeader is changed.


>>>>>>>> TableHeaderBug
import javax.swing.*;
import javax.swing.table.*;

public class TableHeaderBug extends JFrame {

    public TableHeaderBug() {
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	JTable table = new JTable(new AbstractTableModel() {
		public int getRowCount() { return 10; }
		public int getColumnCount() { return 10; }

		public Object getValueAt(int row, int column) {
		    return new Integer(row * column);
		}
	    });

	// Enabling this line doens't produce a table header.
	table.setTableHeader(new JTableHeader());

	// workaround is to use the JTableHeader(TableColumnModel) ctor
	//table.setTableHeader(new JTableHeader(table.getColumnModel()));

	getContentPane().add(new JScrollPane(table));
	pack();
    }

    public static void main(String[] args) {
	TableHeaderBug bug = new TableHeaderBug();
	bug.setVisible(true);
    }
}