JButton erro

package escravo;

import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.awt.AWTException;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author RODRIGO
 */
public class Principal extends javax.swing.JPanel {

    /** Creates new form Principal */
    public Principal() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jButton1 = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();

        jButton1.setText("Editar Texto");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jLabel1.setText("Desenvolvido por: Alan Nogueira");

        jLabel2.setText("[email removido]");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addContainerGap())
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel2)
                        .addGap(24, 24, 24))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jButton1)
                        .addGap(40, 40, 40))))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(18, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 14, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(5, 5, 5)
                .addComponent(jLabel2))
        );
    }// </editor-fold>

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
   int keyInput[] = {
    		 KeyEvent.VK_END,
    		 KeyEvent.VK_DELETE,
    		 KeyEvent.VK_SPACE,

        };

    Robot robot = null;
        try {
            robot = new Robot();
        } catch (AWTException ex) {
            Logger.getLogger(Principal.class.getName()).log(Level.SEVERE, null, ex);
        }

    robot.keyPress(KeyEvent.VK_ALT);
    robot.keyPress(KeyEvent.VK_TAB);
    robot.delay(200);
    robot.keyRelease(KeyEvent.VK_ALT);
    robot.keyRelease(KeyEvent.VK_TAB);


    for (int cnt2 = 0;cnt2 <= 200; cnt2++){
    for (int key : keyInput) {
      robot.keyPress(key);
      robot.delay(20);
    }           
    }
    }


    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    // End of variables declaration

}