Print doesn't work for swing components. It throws NullPointerException. If replace swing components with AWT compoents, it will work.

Try the following test case to print a JFrame which contains swing components.

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import com.sun.java.swing.*;

public class Test extends JFrame implements ActionListener{

  public static void main(String[] argc){
    Test T=new Test();
    T.setSize(new Dimension(200,200));
    T.setVisible(true);
  }

  public Test(){
        this.getContentPane().setLayout( new BorderLayout());
    this.getContentPane().add("North",new JLabel("Hello!"));
    JButton b=new JButton("Print");
    b.addActionListener(this);
    this.getContentPane().add("Center",b);
  }

  public void actionPerformed(ActionEvent e){
    String com=e.getActionCommand();
    if (com.equals("Print")){
      PrintJob pj= getToolkit().getPrintJob(this,"Print test!",new Properties());
      Graphics g=pj.getGraphics();
      printAll(g);
      g.dispose();
      pj.end();
    }
  }
}