Trabalhando com nachocalendar

Programação Java
#1

Caros, recentemente comecei a trabalhar com a classe nachocalendar, mas estou tendo algumas dificuldades.
Tomando como base a documentação desta classe, implementei o seguinte codigo:

    public void actionPerformed(final ActionEvent arg0) {
          SimpleDateFormat formatter = new SimpleDateFormat("dd/mm/yy"); 
          Date data = (Date) datefield.getValue();				  
          System.out.println(formatter.format(data));  
}

Porem, a lina 3, apresenta o seguinte erro:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at Calendario.getValue(Calendario.java:70)
	at Calendario$2.actionPerformed(Calendario.java:46)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

Gostaria de uma ajuda dos senhores para solucionar este problema, uma vez que o uso dessa classe facilita e muito a manipulação de componentes visuais.

#2

Bom, pelo visto a sua instância do NachoCalendar está nula.
Se quiser tratar apenas nesse método, você pode colocar um IF e fica +/- assim:

 public void actionPerformed(final ActionEvent arg0) {  
           SimpleDateFormat formatter = new SimpleDateFormat("dd/mm/yy");   
           if(datefield != null) {
               Date data = (Date) datefield.getValue();                  
               System.out.println(formatter.format(data));    
           }
 }

Agora, para saber porque o seu datefield está nulo só passando o resto do código.

[]´s

Daniel

#3