Just Another Resource problem

[Olivier Legat]

Howdy folks,

So here is a simplified version of one of a class I made:

public class GameConstants
{
	public static final URL //tempo: 150
		MUSIC_TETRIS = MidiPlayer.class.getResource("./tetris.mid");
	public static final URL //tempo: 105
		MUSIC_BLOCKSOFDOOM = MidiPlayer.class.getResource("./blocksofdoom.mid");
	public static final URL //tempo: 180
		MUSIC_LIONHEART = MidiPlayer.class.getResource("./lionheart.mid");
	public static final URL //tempo: 140
		MUSIC_HEAVYBLOCK = MidiPlayer.class.getResource("./heavyblocks.mid");
	public static final URL //tempo: 135
		MUSIC_HYPERMODE = MidiPlayer.class.getResource("./hypermode.mid");
	public static final URL
		MUSIC_MENU = MenuSong.class.getResource("./tetris-bg.wav");
	
	public static final URL
		SOUND_THUNDER = Sounds.class.getResource("./thunder.wav");
	public static final URL
		SOUND_COMBO = Sounds.class.getResource("./combo.wav");
	public static final URL 
		SOUND_WIN = Sounds.class.getResource("./win.wav");
	public static final URL 
		SOUND_LOST = Sounds.class.getResource("./lost.wav");
	
	public static final ImageIcon
		CURSOR_0_IMAGE = new ImageIcon(
				Menu.class.getResource("./cursor.png")  );
	public static final Cursor
		CURSOR_0 = Toolkit.getDefaultToolkit().
				createCustomCursor(CURSOR_0_IMAGE.getImage(), new Point(), "cursor1");
	
	public final static ImageIcon IMAGE_WELCOME =
		new ImageIcon(Menu.class.getResource("./multitris.JPG"));
	public final static ImageIcon IMAGE_ICON =
		new ImageIcon(Menu.class.getResource("./winlogo.png"));
	public static final Icon IMAGE_DEFAULT_BUTTON = 
		new ImageIcon(Menu.class.getResource("./button.png"));
}

At first I tried without the dot '.' before the slash '/' but I was getting a NullPointerException, it seems to work fine on Eclipse with the '.'

However, when making a JAR file and running it with java -jar file.jar I get the exact same nasty error code as I do when I run it in Eclipse with the '.'s. Removing the dots and making the JAR file doesn't work either. I'm very curious as to why this doesn't work because I've used the exact same method before without any problems (without the dots however).

Error code:

Exception in thread "main" java.lang.ExceptionInInitializerError
at tetris.controller.GUIController.<init>
at tetris.Main.main
Caused by: java.lang.NullPointerException
at javax.swing.ImageIcon.<init>
at tetris.GameConstants.<clinit>
... 2 more

Help on this would greatly be appreciated

[Rob Spoor]

Olivier Legat wrote:At first I tried without the dot '.' before the slash '/' but I was getting a NullPointerException, it seems to work fine on Eclipse with the '.'

With a leading "/" Java will look for the files at the root of the current folder / JAR file. The "./" means relative to the class you request the resources with.

However, when making a JAR file and running it with java -jar file.jar I get the exact same nasty error code as I do when I run it in Eclipse with the '.'s. Removing the dots and making the JAR file doesn't work either. I'm very curious as to why this doesn't work because I've used the exact same method before without any problems (without the dots however).

getResource returning null means the resource can't be found. Check if they are in the same folder as your .class files.

[Jonas Isberg]

(Edit: This is similar to what Rob Prime just said, I kind of missed his post though.)
First I will have to AdmitWhenYouAreGuessing.

If you check the full stack trace there might be a FileNotFoundException
hidden. Make sure that you know which directory the . (dot) resolves to.
The stack trace might show you where the program is searching for the
file.

You might want to post the full stack trace.

(Points for simplifying the class, you are half way to IsolateTheProblem. :-))

[Olivier Legat]

Rob Prime wrote:With a leading "/" Java will look for the files at the root of the current folder / JAR file. The "./" means relative to the class you request the resources with.

Indeed, you're right The resource files are in the same folders as the classes that make use of them, hence why I intended to use "./", but in fact it works fine without adding anything at all before the filename. Such as so:

public class GameConstants  
{  
    public static final URL //tempo: 150  
        MUSIC_TETRIS = MidiPlayer.class.getResource("tetris.mid");  
}

Apparently the method getResource automatically add "package_path"+"/" before the name if there isn't a '/' already. I can't I didn't spot that first

Thank-you all for your time and help.

[Rob Spoor]

You're welcome.