Groups > comp.lang.java.programmer > #18877

CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean

Newsgroups	comp.lang.java.programmer
Date	2012-09-21 07:57 -0700
Message-ID	<e4bc8305-301d-461e-a218-5c0529c1cc67@googlegroups.com> (permalink)
Subject	CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean
From	clusardi2k@aol.com

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Hello, I have discovered a hidden error. My project was working for awhile, but then I started to get the below error.

My error comes from the fact that I'm using a checkbox in a jtable, and I'm using the below "getColumnClass".

Thank you,

compile:
run:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean
	at javax.swing.JTable$BooleanRenderer.getTableCellRendererComponent(JTable.java:5412)
	at javax.swing.JTable.prepareRenderer(JTable.java:5735)
	at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2114)
	at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:2016)
	at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1812)
	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161)
	at javax.swing.JComponent.paintComponent(JComponent.java:778)
	at javax.swing.JComponent.paint(JComponent.java:1054)
	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5221)
	at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1482)
	at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1413)
	at javax.swing.RepaintManager.paint(RepaintManager.java:1206)
	at javax.swing.JComponent._paintImmediately(JComponent.java:5169)
	at javax.swing.JComponent.paintImmediately(JComponent.java:4980)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:770)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:728)
	at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:677)
	at javax.swing.RepaintManager.access$700(RepaintManager.java:59)
	at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1621)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:701)
	at java.awt.EventQueue.access$000(EventQueue.java:102)
	at java.awt.EventQueue$3.run(EventQueue.java:662)
	at java.awt.EventQueue$3.run(EventQueue.java:660)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:671)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)


--------
The below project runs perfectly. Without seeing my large project, how can I modify the below project to get my other large project to work.

package sorttable;

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

   public class SortTable {
     public static void main(String args[]) {
       Runnable runner = new Runnable() {
        public void run() {
           JFrame frame = new JFrame("Sorting JTable");
           frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           Object rows[][] = {
               {"VOD",  "Vodafone Group", 26.02, new Boolean(false), new Boolean(false)},
               {"SUNW", "Sun Microsystems", 3.86, new Boolean(true), new Boolean(false)},
               {"EBAY", "eBay", 41.57, new Boolean(false), new Boolean(false)},
               {"GOOG", "Google", 388.33, new Boolean(false), new Boolean(false)},
               {"MSFT", "Microsoft", 26.56, new Boolean(true), new Boolean(false)},
               {"NOK", "Nokia Corp", 17.13, new Boolean(false), new Boolean(false)},
               {"ORCL", "Oracle Corp.", 12.52, new Boolean(true), new Boolean(false)},
               {"TWX",  "Time Warner", 17.66, new Boolean(false), new Boolean(false)},
               {"AMZN", "Amazon", 41.28, new Boolean(false), new Boolean(false)},
               {"YHOO", "Yahoo!", 37.69, new Boolean(false), new Boolean(false)}
             };
           String columns[] = {"Symbol", "Name", "Price", "OK", "Cheap"};
           TableModel model =
               new DefaultTableModel(rows, columns) {
             public Class getColumnClass(int column) {
               Class returnValue;
               if ((column >= 0) && (column < getColumnCount())) {
                 returnValue = getValueAt(0, column).getClass();
               } else {
                 returnValue = Object.class;
               }
               return returnValue;
             }
           };

           JTable table = new JTable(model);
           RowSorter<TableModel> sorter =
             new TableRowSorter<TableModel>(model);
           
           java.util.List sortKeys = new ArrayList();
           sortKeys.add(new RowSorter.SortKey(3, SortOrder.ASCENDING));
           sorter.setSortKeys(sortKeys);

           table.setRowSorter(sorter);
           JScrollPane pane = new JScrollPane(table);
           frame.add(pane, BorderLayout.CENTER);
           frame.setSize(300, 150);
           frame.setVisible(true);
         }
       };
       EventQueue.invokeLater(runner);
     }
   }

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CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean clusardi2k@aol.com - 2012-09-21 07:57 -0700
  Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean clusardi2k@aol.com - 2012-09-21 08:01 -0700
    Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean clusardi2k@aol.com - 2012-09-21 08:32 -0700
  Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-09-21 11:57 -0400
  Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-09-21 10:31 -0700
    Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean clusardi2k@aol.com - 2012-09-21 11:43 -0700
      Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean Lew <lewbloch@gmail.com> - 2012-09-21 12:21 -0700
        Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean clusardi2k@aol.com - 2012-09-21 21:16 -0700
        Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean clusardi2k@aol.com - 2012-09-21 21:23 -0700
          Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean clusardi2k@aol.com - 2012-09-22 08:22 -0700
            Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean Stuart <DerTopper@web.de> - 2012-09-23 16:44 +0200
  Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean Lew <lewbloch@gmail.com> - 2012-09-21 10:32 -0700
    Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean Roedy Green <see_website@mindprod.com.invalid> - 2012-09-22 15:37 -0700
  Re: CheckBox in Column of JTable: Exception: java.lang.String cannot be cast to java.lang.Boolean Roedy Green <see_website@mindprod.com.invalid> - 2012-09-22 15:30 -0700

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