[Java] are only accepted if annotation processing is explicitly requested

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

/**
 *
 * Beschreibung
 *
 * @version 1.0 vom %DATUM%
 * @author %AUTOR%
 */

public class TurtleFenster extends JFrame {
 // Anfang Attribute
 private Turtle turtle1 = new Turtle(1, 1);
 private JButton jButton1 = new JButton();
 private JTextField jTF_Rektiefe = new JTextField();
 private JTextField jTF_Strichlaenge = new JTextField();
 private JLabel jLabel1 = new JLabel();
 private JLabel jLabel2 = new JLabel();
 // Ende Attribute

 public TurtleFenster(String title) {
 // Frame-Initialisierung
 super(title);
 setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
 int frameWidth = 813;
 int frameHeight = 518;
 setSize(frameWidth, frameHeight);
 Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
 int x = (d.width - getSize().width) / 2;
 int y = (d.height - getSize().height) / 2;
 setLocation(x, y);
 Container cp = getContentPane();
 cp.setLayout(null);
 // Anfang Komponenten

 turtle1.setBounds(8, 8, 600, 473);
 cp.add(turtle1);
 turtle1.setForeground(Color.red);
 turtle1.setBackground(Color.BLACK);


 jButton1.setBounds(688, 88, 99, 25);
 jButton1.setText("Kochkurve");
 jButton1.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent evt) {
 jButton1_ActionPerformed(evt);
 }
 });
 cp.add(jButton1);
 jTF_Rektiefe.setBounds(736, 16, 49, 24);
 jTF_Rektiefe.setText("3");
 cp.add(jTF_Rektiefe);
 jTF_Strichlaenge.setBounds(736, 48, 49, 24);
 jTF_Strichlaenge.setText("");
 cp.add(jTF_Strichlaenge);
 jLabel1.setBounds(624, 16, 96, 16);
 jLabel1.setText("Rekursionstiefe:");
 jLabel1.setFont(new Font("MS Sans Serif", Font.PLAIN, 13));
 cp.add(jLabel1);
 jLabel2.setBounds(624, 56, 70, 16);
 jLabel2.setText("Strichlänge:");
 jLabel2.setFont(new Font("MS Sans Serif", Font.PLAIN, 13));
 cp.add(jLabel2);
 // Ende Komponenten

 setResizable(false);
 setVisible(true);
 }

 // Anfang Methoden
 public void jButton1_ActionPerformed(ActionEvent evt) {
 // TODO hier Quelltext einfügen
 turtle1.clear();
 turtle1.moveto(0, 220);
 //Integer.parseInt(jTF_Rektiefe.getText())
 Kochkurve(Integer.parseInt(jTF_Rektiefe.getText()), 600.0);

 /*turtle1.draw(40);
 turtle1.turn(90);
 turtle1.move(40);
 turtle1.turn(30);
 turtle1.draw(90);
 turtle1.turn(120); */
 }

 // Ende Methoden

 public static void main(String[] args) {
 TurtleFenster tf = new TurtleFenster("TurtleFenster");
 }
 
 public void Kochkurve(int Nummer,double Strichlaenge) {

 if (Nummer==1) {
 turtle1.draw(Strichlaenge);
 } else {
 Kochkurve(Nummer-1, Strichlaenge/3);
 turtle1.turn(60);
 Kochkurve(Nummer-1, Strichlaenge/3);
 turtle1.turn(-120);
 Kochkurve(Nummer-1, Strichlaenge/3);
 turtle1.turn(60);
 Kochkurve(Nummer-1, Strichlaenge/3);
 }
 /*turtle1.draw(40);
 turtle1.turn(90);
 turtle1.move(40);
 turtle1.turn(30);
 turtle1.draw(90);
 turtle1.turn(120);*/
 }
}