JXDatePicker - could not find the main class?

Question

Hi all,
I am trying to play with the JXDatePicker swinglabs.
I wrote this trivial code:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import org.jdesktop.swingx.JXDatePicker;
public class TestJXDatePicker implements ActionListener
    public JLabel label = new JLabel();
    public JXDatePicker datePicker = new JXDatePicker(System.currentTimeMillis());
     public TestJXDatePicker()
          label.setText("Choose Date by selecting below.");
          JFrame frame = new JFrame();
          frame.getContentPane().add(label, BorderLayout.NORTH);
          frame.getContentPane().add(datePicker, BorderLayout.CENTER);
     public void actionPerformed(ActionEvent arg0)
          if (arg0.getSource()==datePicker)
               label.setText(datePicker.getDate().toString());          
    public static void main(String[] args)
         new TestJXDatePicker();
}Unfortunately, I get this message:
Java virtual machine Launcher
Could not find the main class. program will exit.
the trace is:
java.lang.UnsupportedClassVersionError: org/jdesktop/swingx/JXDatePicker (Unsupported major.minor version 49.0)
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.access$100(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Exception in thread "main"
ANY IDEA???
JDK = 1.4 (also tried with compiler comliance lever 5.0) nothing :-(

Answer 1

I had a look through the SwingX stuff and decided that it looks like the project has stalled (the main site says something about being overhauled - but it's been like that for ages).
I'm using JCalendar - there's recently been a new release and it's brilliant.
Check out http://www.toedter.com/en/jcalendar/.
Hope this helps.
Paul C.