null pointer exception question

[zlloyd1]

I am trying to run the following code, which I believe is fairly straightforward, but it does not work.... It compiles, and it will run, but none ofn the objects are appearing in the window that opens, and when I close the window, and look at the command prompt, I see a bunch of complaints about null pointers that I do not understand??

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
public class tutorial1 extends JFrame{ //1
  private JPanel jp;  //2
  private JButton b1; //3
  private JTextField txtfld; //4
  private JTextArea jt = new JTextArea(8,8); //5
    public tutorial1 () { //6
    setTitle("title"); //7
    setVisible(true); //8
    setSize(480,480); //9
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //10
    b1 = new JButton("Exit"); //11
    jp.add(b1); //12
    jp.add(jt); //13
    add(jp); //14
    event e = new event(); //15
    b1.addActionListener(e); //16 
    } //17
    public class event implements ActionListener{ //18
      public void actionPerformed(ActionEvent e){ //19
        System.exit(0); //20
       }} //21
  public static void main(String[] args){ //22
    tutorial1 t1 = new tutorial1(); //23
    t1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 24
    t1.setTitle("title"); //25
    t1.setSize(480,480); //26
    t1.setVisible(true); //27
    } //28
} //29

When I run this, it compiles fine, and runs, but the components of the interface do not show up. No panel, no textfield, no buttons, just a blank frame with a title, and the compiler kicks back this error:
Exception in thread "main" java.lang.NullPointerException
at tutorial1.<init><tutorial1.java:15>
at tutorial1.main<tutorial1.java:26>
Can anyone PLEASE tell me why this won't work?? I know it is something simple and stupid that I have missed, but I am stuck right here, and cannot continue!!
HELP!!

[Fubarable]

The key is to check the line that causes the NPE to be thrown. So please tell us, which line is the exception telling you that there is a problem?

[Wnt2bsleepin]

What do you see that is wrong with line 15?

[Fubarable]

OK, so line 15 is this?

jp.add(b1);

If so, you will want to check to see that *all* the variables used on this line have been initialized. There are only two variables, so this should be easy for you to check (and solve!).

[zlloyd1]

I have checked line 15, and I could not find any problems with initializing the button. I also checked line 26, but could not figure what would cause that to be a nullpointerexception issue.

[Fubarable]

I have checked line 15, and I could not find any problems with initializing the button. I also checked line 26, but could not figure what would cause that to be a nullpointerexception issue.

The button is not the variable that is dereferenced on that line. There's another variable on that line that you call a method on. Have you checked it? That's why I used the term *all* in my post above.