Why i can not run HelloJava as an application？

[chenmgm]

I copyed the code from http://pivot.apache.org/tutorials/hello-world.html to
my eclipse 

But i could not run it successfully as an application

And the console show me：

java.lang.ClassNotFoundException: org/apache/pivot/tutorials/HelloJava
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at
org.apache.pivot.wtk.DesktopApplicationContext.main(DesktopApplicationContext.java:601)
        at
org.apache.pivot.wtk.DesktopApplicationContext.main(DesktopApplicationContext.java:870)
        at org.apache.pivot.tutorials.HelloJava.main(HelloJava.java:56)

my code is：

package org.apache.pivot.tutorials;
 
import java.awt.Color;
import java.awt.Font;
 
import org.apache.pivot.collections.Map;
import org.apache.pivot.wtk.Application;
import org.apache.pivot.wtk.DesktopApplicationContext;
import org.apache.pivot.wtk.Display;
import org.apache.pivot.wtk.HorizontalAlignment;
import org.apache.pivot.wtk.Label;
import org.apache.pivot.wtk.VerticalAlignment;
import org.apache.pivot.wtk.Window;
 
public class HelloJava implements Application {
    private Window window = null;
 
    @Override
    public void startup(Display display, Map<String, String> properties) {
        window = new Window();
 
        Label label = new Label();
        label.setText("Hello World!");
        label.getStyles().put("font", new Font("Arial", Font.BOLD, 24));
        label.getStyles().put("color", Color.RED);
        label.getStyles().put("horizontalAlignment",
            HorizontalAlignment.CENTER);
        label.getStyles().put("verticalAlignment",
            VerticalAlignment.CENTER);
 
        window.setContent(label);
        window.setTitle("Hello World!");
        window.setMaximized(true);
 
        window.open(display);
    }
 
    @Override
    public boolean shutdown(boolean optional) {
        if (window != null) {
            window.close();
        }
 
        return false;
    }
 
    @Override
    public void suspend() {
    }
 
    @Override
    public void resume() {
    }
    
    public static void main(String[] args) {
        DesktopApplicationContext.main(HelloJava.class, args);
    }
}



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