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Help with JTable ... ClassCastException

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  Help with JTable ... ClassCastException Luiss <luiss@aol.com> - 2012-05-06 12:03 +0200
    Re: Help with JTable ... ClassCastException Luiss <luiss@aol.com> - 2012-05-07 00:18 +0200
    Re: Help with JTable ... ClassCastException Roedy Green <see_website@mindprod.com.invalid> - 2012-05-06 19:14 -0700
    Re: Help with JTable ... ClassCastException Lew <noone@lewscanon.com> - 2012-05-06 20:43 -0700

#14330 — Help with JTable ... ClassCastException

Hi all,

I'm writing a GUI to show a JTable cointaining data from a db table 
(after I'll add also buttons to Add, Update and Delete rows). I need to 
have different table fields and not only strings.

I've used Hibernate to do the select and then passed the list to a 
Vector containing ConfigPersonale objects (my table bean).

I get this exception running the GUI:

********************************
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: 
com.ale.ts.persistence.ConfigPersonale cannot be cast to java.util.Vector
	at 
javax.swing.table.DefaultTableModel.justifyRows(DefaultTableModel.java:251)
	at 
javax.swing.table.DefaultTableModel.setDataVector(DefaultTableModel.java:207)
	at javax.swing.table.DefaultTableModel.<init>(DefaultTableModel.java:142)
	at 
com.ale.ts.view.ConfigPersonaleFrame$1.<init>(ConfigPersonaleFrame.java:42)
	at 
com.ale.ts.view.ConfigPersonaleFrame.<init>(ConfigPersonaleFrame.java:43)
	at com.ale.ts.view.TS_UI$3.actionPerformed(TS_UI.java:100)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
	at 
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
	at 
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
	at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:809)
	at 
javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:850)
	at java.awt.Component.processMouseEvent(Component.java:6290)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
	at java.awt.Component.processEvent(Component.java:6055)
	at java.awt.Container.processEvent(Container.java:2039)
	at java.awt.Component.dispatchEventImpl(Component.java:4653)
	at java.awt.Container.dispatchEventImpl(Container.java:2097)
	at java.awt.Component.dispatchEvent(Component.java:4481)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
	at java.awt.Container.dispatchEventImpl(Container.java:2083)
	at java.awt.Window.dispatchEventImpl(Window.java:2482)
	at java.awt.Component.dispatchEvent(Component.java:4481)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:648)
	at java.awt.EventQueue.access$000(EventQueue.java:84)
	at java.awt.EventQueue$1.run(EventQueue.java:607)
	at java.awt.EventQueue$1.run(EventQueue.java:605)
	at java.security.AccessController.doPrivileged(Native Method)
	at 
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at 
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
	at java.awt.EventQueue$2.run(EventQueue.java:621)
	at java.awt.EventQueue$2.run(EventQueue.java:619)
	at java.security.AccessController.doPrivileged(Native Method)
	at 
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:618)
	at 
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	at 
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
	at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
********************************



****************************************
public class ConfigPersonaleFrame extends JFrame {

	private JPanel contentPane;
	private QueryConfigPersonale queryConfpers = new QueryConfigPersonale();
	private JTable table;

	public ConfigPersonaleFrame() {
		setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new JPanel();
		setAlwaysOnTop(true);
		setTitle("Configurazione Personale");
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		table = new JTable();
		String[] columnNames_a = {"A", "B", "C", "D", "E", "F", "G", "H", "I", 
"J", "K", "L", "M", "N", "O", "P", "Q"};
		Vector<String> columnNames = new 
Vector<String>(Arrays.asList(columnNames_a));
		Vector<ConfigPersonale> dataTable = queryConfpers.getConfigPersonale();
		
		table.setModel(new DefaultTableModel(
				dataTable, columnNames) {
			Class[] columnTypes = new Class[] {
				Integer.class, String.class, String.class, Double.class, 
Double.class, Integer.class, Double.class, String.class, Double.class, 
Double.class, Double.class, Double.class, Double.class, Double.class, 
Double.class, Boolean.class, Timestamp.class
			};
			public Class getColumnClass(int columnIndex) {
				return columnTypes[columnIndex];
			}
		});
		
		contentPane.add(table);
		
		//TODO: Add + Update + Delete
	}
}

*********************************************

public class QueryConfigPersonale {
	private Session session;
	private Query query;
	private List<ConfigPersonale> configPersList;

	//select * from ConfigPersonale
	@SuppressWarnings("unchecked")
	public Vector<ConfigPersonale> getConfigPersonale() {
		session = SessionFactoryUtil.getSessionFactory().getCurrentSession();
		session.beginTransaction();
		query = session.createQuery("from ConfigPersonale");
	
		configPersList = query.list();
	    session.getTransaction().commit();
	
	    return new Vector<ConfigPersonale>(configPersList);
	}
}

*********************************************

Please could you help ?

Thanks and best regards,
Luiss

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#14344

Il 06/05/2012 13:09, Stefan Ram ha scritto:
> Luiss<luiss@aol.com>  writes:
>> new DefaultTableModel(dataTable, columnNames)
>
>    « dataTable » dovrebbe essere un vettore di vettori,
>    non un vettore di ConfigPersonale.
>

ottimo grazie mille

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#14346

On Sun, 06 May 2012 12:03:46 +0200, Luiss <luiss@aol.com> wrote,
quoted or indirectly quoted someone who said :

>Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: 

see
http://mindprod.com/jgloss/runerrormessages.html#CLASSCASTEXCEPTION

for general information on them.
-- 
Roedy Green Canadian Mind Products
http://mindprod.com
Programmers love to create simplified replacements for HTML. 
They forget that the simplest language is the one you 
already know. They also forget that their simple little 
markup language will bit by bit become even more convoluted 
and complicated than HTML because of the unplanned way it grows.
.

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#14348

On 05/06/2012 03:03 AM, Luiss wrote:
> Hi all,
>
> I'm writing a GUI to show a JTable cointaining data from a db table (after
> I'll add also buttons to Add, Update and Delete rows). I need to have
> different table fields and not only strings.
>
> I've used Hibernate to do the select and then passed the list to a Vector
> containing ConfigPersonale objects (my table bean).
>
> I get this exception running the GUI:
>
> ********************************
> Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException:
> com.ale.ts.persistence.ConfigPersonale cannot be cast to java.util.Vector

Don't use 'Vector' anyway, and do perform all GUI work on the Event Dispatch 
Thread.

In this code:

> public class QueryConfigPersonale {
>     private Session session;
>     private Query query;
>     private List<ConfigPersonale> configPersList;
>
>     //select * from ConfigPersonale
>     @SuppressWarnings("unchecked")
>     public Vector<ConfigPersonale> getConfigPersonale() {
>         session = SessionFactoryUtil.getSessionFactory().getCurrentSession();
>         session.beginTransaction();
>         query = session.createQuery("from ConfigPersonale");
>
>         configPersList = query.list();
>         session.getTransaction().commit();
>
>         return new Vector<ConfigPersonale>(configPersList);
>     }
> }

you use old-fashioned Hibernate ('Session' instead of 'EntityManager'). Use 
the JPA style.

Don't suppress unchecked warnings. That's very bad. How do you know it's safe 
to do that? You have absolutely no documentation in your code to explain why 
it's safe. That's bad.

The Hibernate query returns a list already. Why convert it to a 'Vector'?

-- 
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg

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