Content pane input map

Question

hi, I am having a headache trying to decipher why the following code gives me a null pointer exception
package comerciop;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
public class teste
   public static void main(String[] args)
      JFrame a = new JFrame();
      KeyStroke esc = KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0, false);
      Action fechaFrame = new AbstractAction()
         public void actionPerformed(ActionEvent e) {
            System.out.println("esc");
      a.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(esc, "esc");
      a.getRootPane().getActionMap().put("esc", fechaFrame);
      System.out.println(a.getRootPane().getInputMap().allKeys());
      KeyStroke[] keys = a.getRootPane().getInputMap().allKeys();
      for(KeyStroke key : keys)
         System.out.println(key);
      a.setVisible(true);
run:
null
Exception in thread "main" java.lang.NullPointerException
        at comerciop.teste.main(teste.java:25)I put a KeyStroke object into the frame inputMap, and then when asked to print the inputMap keys array, it returns null and obviously when I try to access the keys array I get an exception
Why is this?
Edited by: DMD_ANFINI on Jul 13, 2009 11:27 AM
Edited by: DMD_ANFINI on Jul 13, 2009 11:39 AM
Edited by: DMD_ANFINI on Jul 13, 2009 11:42 AM

Answer 1

nevermind, problem solved
changed
KeyStroke[] keys = a.getRootPane().getInputMap().allKeys()to
KeyStroke[] keys = a.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).allKeys()