Using an Image Panel with a Jar

Question

I am having trouble getting my ImagePanel to display when I pack it was a jar. When I run the project from Eclipse it displays just fine. here is the line that creates the ImagePanel:

ImagePanel panel = new ImagePanel(this.getClass().getClassLoader()
    .getResource("edu/luc/tictactoe/gui/resources/images/UIMM.png"));
frame.setContentPane(panel);

and here is the ImagePanel class:

@SuppressWarnings("serial")
public class ImagePanel extends JPanel {

    BufferedImage img;

    public ImagePanel(URL url) {
        super(true);
        this.setToolTipText(url.getPath());
        try {
            img = ImageIO.read(new File(url.getPath()));
            this.setPreferredSize(new Dimension(
                img.getWidth(), img.getHeight()));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void paintComponent(Graphics g) {
        g.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), null);
    }
}

Any suggestions?

unrelated to your current problem: (repetition of my comment to @trashgod in his answer http://stackoverflow.com/questions/2960279/add-other-components-to-jframe-with-background) a) super(true) is redundant, panel is double-buffering by default b) even when covering everything, it might have transparent areas - so not calling super is complying to super's contract only if opaque == false. which it isn't by default and can be changed by client code at any time. So it's not really safe, and letting your IDE type one additional line is ... :-) — kleopatra, Dec 05 '11 at 13:11
`g.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), null);` Since a `JPanel` is an `ImageObserver`, replace `null` with `this`. — Andrew Thompson, Dec 05 '11 at 13:43

Andrew Thompson · Accepted Answer · 2011-12-05T13:42:12.463

img = ImageIO.read(new File(url.getPath()));  // REMOVE!

Try this instead..

img = ImageIO.read(url);

BTW - When things go wrong it would pay not to stumble blindly through what is happening. Better to use a debugger and examine the actual values passed, or at least use System.out.pritln() as a sanity check. E.G.

import java.net.URL;

class URLTest {

    public static void main(String[] args) throws Exception {
        URL url = new URL("jar:file:/C:/baz.jar!/COM/foo/Quux.class");
        System.out.println(url);
        System.out.println(url.getPath());
    }
}

Output

jar:file:/C:/baz.jar!/COM/foo/Quux.class
file:/C:/baz.jar!/COM/foo/Quux.class

Now tell me. Does the path even look like a file name/path?

When in doubt. Print out.

score 0 · Answer 2 · answered Dec 05 '11 at 12:59

you need to make it into a jar, within the folder that you've made it in make a folder called "edu" in that a folder called "tictactoe" in that "gui" in that "resources" in that "images" and finaly in that, make a picture called "UIMM.png"

in other words, make the same folder structure with in the folder the jar in in.

I had the same problem as well p.s I think you are using a mac, if you are, bundle it with Jar Bundler app, it's the best bundler for a mac

Using an Image Panel with a Jar

2 Answers2

Output

Linked