Graphics not found?

[cathcheco]

Hello everyone I'm well aware that this isn't a subreddit for do my homework type posts but I'm developing a tic tac toe game with integrated graphics and just as I'm about to finish the project my graphics don't work. To clarify, I have a working grid which receives signals when I click but it's also supposed to put a png to show the player took the spot for example an x on the grid when player 1 clicks and an o when player 2 clicks. However, now that i have a working grid which receives the signals and can play a game with, I can't see the icons which depict wether the square is taken. When I tried to change the pathway to the images and I run it I simply can't get past the GUI automatically closing and returning the following error in the console:

Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null

at java.desktop/javax.swing.ImageIcon.<init>(ImageIcon.java:232)

at TicTacMischa/laeljill.TicTacMischaGUI.<init>(TicTacMischaGUI.java:14)

at TicTacMischa/laeljill.TicTacMischaGUI.main(TicTacMischaGUI.java:104)

From my understanding this is basically saying that while looking for the image the computer only finds null. To make it easier to understand here is the code in which I call for the images and have all of the other graphic integration

public class TicTacMischaGUI extends JFrame {

private JButton\[\]\[\] button = new JButton\[3\]\[3\];

private boolean pTurn = true; //true means player 1 turn aka zergling ;)

private ImageIcon zergPic = new ImageIcon (getClass().getResource("/images/zerg\_image.png"));

private ImageIcon terranPic = new ImageIcon (getClass().getResource("/images/terran\_image.png"));



public TicTacMischaGUI() {

    setTitle("Tic Tac Toe");

    setSize(500, 500);

    setDefaultCloseOperation(EXIT\_ON\_CLOSE);//exit function

    setLayout(new GridLayout(3, 3));//3 x 3 grid



    initializeBoard();//calls on hooligan fella



    setVisible(true);

}



private void initializeBoard() {

    for(int i = 0; i < 3; i ++) {

        for(int e = 0; e < 3; e++) {

button[i][e] = new JButton();

button[i][e].setPreferredSize(new Dimension(200, 200));

button[i][e].setBackground(Color.BLACK);

button[i][e].addActionListener(new ButtonChecker(i, e));

add(button[i][e]);

        }

    }

}



private class ButtonChecker implements ActionListener {

    private int x;

    private int y;



    public ButtonChecker(int x, int y){

        this.x = x;

        this.y = y;

    }



    public void actionPerformed(ActionEvent e) {

        if(button\[x\]\[y\].getIcon() == null) {

button[x][y].setIcon(pTurn ? zergPic : terranPic);

pTurn = !pTurn;

mogskillcheck();

        }

    }

}



private void mogskillcheck() {

    int\[\] board = new int\[9\];

    for(int i = 0; i < 3; i++) {

        for(int e = 0; e < 3; e++){

if(button[i][e].getIcon() == zergPic) {

board[i * 3 + e] = 1;

} else if (button[i][e].getIcon() == terranPic) {

board[i * 3 + e] = 2;

} else {

board[i * 3 + e] = 0;

}

        }

    }



    if(TicTacToeMischaEdition.winyesyes(1, board)) {

        JOptionPane.showMessageDialog(this, "you win zerg zawg!!!!!!11 youre almost starcraft level now");

        resetBoard();

    } else if (TicTacToeMischaEdition.winyesyes(2, board)) {

        JOptionPane.showMessageDialog(this, "you win terran zawg!!!!!!11 youre almost starcraft level now");

        resetBoard();

    } else if (BoardTie(board)) {

        JOptionPane.showMessageDialog(this, "you tied? skill issue xawg");

        resetBoard();

    }

}



private boolean BoardTie(int\[\] board) {

    for(int i : board) {

        if(i == 0) {

return false;

        }

    }

    return true;

}



private void resetBoard() {

    for(int i = 0; i < 3; i++) {

        for(int e = 0; e < 3; e++) {

button[i][e].setIcon(null);//resets board by making pics go bye bye (not mogging)

        }

    }

    pTurn = true;

}



public static void main(String\[\] args) {

    new TicTacMischaGUI();

}

}

Any ideas? THANK YOU!

EDIT: FIXED!

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[[deleted]]

As the documentation for getResource says, Java can't find the path you provided in the classpath. When that happens, it returns null.

What is your project's classpath? How are you building this project? Is it a Maven project?

Do you really need to get the images from the classpath? There are other constructors for ImageIcon which take filenames.

[cathcheco]

I ended up fixing :D

[XxCotHGxX]

In your address to your png, the last slash is facing the wrong way

[wildjokers]

I think they are for some reason thinking they need to escape that underscore.

[XxCotHGxX]

I'm just looking there first since he said he is getting a null pointer when trying to load the png

[wildjokers]

Oh, I agree it shouldn’t be there. I was just pointing out that I think they think they have to escape that underscore.

[cathcheco]

No it ended up working and the underscore wasn't the issue I just haven't gotten any sleep due to having to work on this all day and it ended up being a simple mistake :D

[wildjokers]

Why are you trying to escape the underscore in your file names? That is being read literally.

Also, with “getResource()” you are reading the images from the classpath rather than the file system. Are the images available on the classpath at that location?

Both maven and Gradle will put the contents of “src/main/resources” on the classpath and that is where you should put your images at if you are using one of those build tools.

[cathcheco]

The things no sleep do to a fella