Thread: Problem with throwing an exception...

Hi, I'm having a problem where I get an error at a throws declaration.

This is the error:

Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
	at sun.awt.SunToolkit.isInstanceOf(Unknown Source)
	at sun.awt.SunToolkit.isInstanceOf(Unknown Source)
	at sun.awt.SunToolkit.isInstanceOf(Unknown Source)
	at sun.awt.SunToolkit.isInstanceOf(Unknown Source)
	at sun.awt.SunToolkit.isInstanceOf(Unknown Source)
	at sun.awt.SunToolkit.isInstanceOf(Unknown Source)
	at sun.awt.SunToolkit.isInstanceOf(Unknown Source)
	at javax.swing.LookAndFeel.installProperty(Unknown Source)
	at javax.swing.plaf.basic.BasicPanelUI.installDefaults(Unknown Source)
	at javax.swing.plaf.basic.BasicPanelUI.installUI(Unknown Source)
	at javax.swing.JComponent.setUI(Unknown Source)
	at javax.swing.JPanel.setUI(Unknown Source)
	at javax.swing.JPanel.updateUI(Unknown Source)
	at javax.swing.JPanel.<init>(Unknown Source)
	at javax.swing.JPanel.<init>(Unknown Source)
	at javax.swing.JPanel.<init>(Unknown Source)
	at layout.GameClient2.<init>(GameClient2.java:60)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)
	at layout.GameClient2.<init>(GameClient2.java:109)

Here is the relevant code:

public GameClient2() throws Exception{ //Line 60
		URL myurl = this.getClass().getResource("/noteicon.png");
		Toolkit tk = this.getToolkit();
		Image img = tk.getImage(myurl);
		frame.setIconImage(img);
		}
 
...
 
GameClient2 s = new GameClient2();  //Line 109

I can't put line 109 in the throws exception because then it wouldn't be visible for when I use it later in the program.

You're calling something repeatedly I think.

Well...actually it appears it's throwing Exception till it runs out of memory or something.

Why I don't know.

I'm not sure what you mean by the "big" class, but I think I must be doing that. However, there's no other way I can do it since I need this to be visible to places later in the program.

What I meant I had an inner class and was, to make a change to the main class that the inner class was inside, I made an object of the main class inside the inner class, but it basically would've called the JFrame within itself over and over till it ran out of space since it had an instance of itself inside of itself...in essence a sort of infinite loop but not a loop per se.

Why wouldn't it be visible?

Maybe you can't throw Exception with a throws clause, but could you have the method that you're creating this

GameClient2 object throw the Exception instead of putting the GameClientObject itself in a throws clause?

Originally Posted by javapenguin

Maybe you can't throw Exception with a throws clause, but could you have the method that you're creating this

GameClient2 object throw the Exception instead of putting the GameClientObject itself in a throws clause?

I can't do that, this is what it's like:

public class GameClient2 extends JPanel implements ActionListener {
public GameClient2() throws Exception{ //Line 60
        URL myurl = this.getClass().getResource("/noteicon.png");
        Toolkit tk = this.getToolkit();
        Image img = tk.getImage(myurl);
        frame.setIconImage(img);
        }
 
...
 
GameClient2 s = new GameClient2();  //Line 109
 
public static void createAndShowGame() {
 
              ...
 
             public void actionPerformed(ActionEvent e) {
                       s.start();
              }
       }
}

So it needs to be visible all the way to the s.start(); but it seems the only way to do that is to put it before the other methods but that causes an error

Could you post the full code, it might make things clearer.

Javapenguin, I suggest you stop posting messages and advice that contain words or phrases like "I think" or "maybe" - read your recent private message.

The_Mexican, the code you posted isn't complete or compilable. However, it looks as though you are repeatedly creating a GameClient2 in the class GameClient2, which creates a recursive nightmare and stack overflow

Yes I see now, thanks to both of you. What I had to do is simply move the statement into the next method then surround pretty much the entire program in a try/catch block. There is probably another way you're suppose to do this but whatever, this works. Thanks!