Invoking TabelColumn.sizeWidthToFit() causes a NullPointerException:
java.lang.NullPointerException
        at java.awt.swing.table.TableColumn$1.getTableCellRendererComponent(TableColumn.java:624)
        at java.awt.swing.table.TableColumn.sizeWidthToFit(TableColumn.java:553)
        at TableTester.<init>(JTableTest.java:70)
        at JTableTest.main(JTableTest.java:17)


Using JDK 1.2 ("J" build).

The following application demonstrates this.

=====================================================================
/* 
 * JTableTest.java
 * Invoking TableColumn.sizeWidthToFit() causes a NullPointerException
 *
 */

import java.awt.BorderLayout;
import java.awt.swing.*;
import java.awt.swing.border.EmptyBorder;
import java.awt.swing.table.*;

public class JTableTest extends JFrame {

   public static void main( String[] argv ) {
      JFrame frame = new JFrame();
	
      frame.getContentPane().add(new TableTester());
      frame.pack();
      frame.setSize(400,350);
      frame.setVisible(true);
   }

   public void JTableTest() {
   }
}

class TableTester extends JPanel {
	JTable table = null;
	TableColumn tc = null;
	
	public TableTester() {
	  setLayout(new BorderLayout());
	  setBorder(new EmptyBorder(5,5,5,5));

	  // Column headers
	  final String[] headers = {"Name", "Capital City", "Language(s)",
				    "Monetary Unit(s)", "EC Member"};

	  // Table data
          final Object[][] data = {
            {"Albania", "Tirane", "Albanian, Greek", "Lek", new Boolean(false)},
            {"Andorra", "Andorra la Vella", "Catalan, French, Spanish", "French Franc, Spanish Peseta", new Boolean(false)},
            {"Austria", "Vienna", "German, Slovenian, Croatian", "Schilling", new Boolean(false)},
            {"Belarus", "Minsk", "Byelorussian, Russian", "Belarusian Rubel", new Boolean(false)},
            {"Belgium", "Brussels", "French, Flemish, German", "Belgian Franc", new Boolean(true)},
	  };

          TableModel dataModel = new AbstractTableModel() {
            public int getColumnCount() { return headers.length; }
            public int getRowCount() { return data.length;}
            public Object getValueAt(int row, int col) {return data[row][col];}
            public String getColumnName(int column) {return headers[column];}
            public Class getColumnClass(int col) {
	        return getValueAt(0,col).getClass();
	    }
            public void setValueAt(Object aValue, int row, int column) {
	      System.out.println("Setting value to " + aValue);
	      data[row][column] = aValue;
 	    }
	    public boolean isCellEditable(int row, int col) {return (col==4);}
          };

          table = new JTable(dataModel);

          JScrollPane scrollpane = JTable.createScrollPaneForTable(table);
	  add(scrollpane, BorderLayout.CENTER);

 	  // Invoking TableColumn.sizeWidthToFit() causes NPE
	  System.out.println("** Invoking TableColumn.sizeWidthToFit()... ");
	  table.getColumn(table.getColumnName(2)).sizeWidthToFit();
	}
}
=====================================================================
Here is some more info:
Found a bug in JFC 1.0.1 TableColumn.sizeWidthToFit();  In line 553 of TableColumn.java, a call is made to getTableCellRenderComponent.

	comp = this.getHeaderRenderer().getTableCellRendererComponent(null,
				getHeaderValue(), false, false, 0, 0);

	The call fails at line 624 since the null being passed into getTableCellRenderComponent instead of a valid table...

    protected TableCellRenderer createDefaultHeaderRenderer() {
	DefaultTableCellRenderer label = new DefaultTableCellRenderer() {
	    public Component getTableCellRendererComponent(JTable table, Object value,
                         boolean isSelected, boolean hasFocus, int row, int column) {
	        JTableHeader header = table.getTableHeader(); 


ronan.mandel@Eng 1998-03-16