Java Images not drawn when running java -jar

Question

I have a problem i have never had before and couldnt find a solution on the web. I have a small Programm which uses some images to print a menu.

This is the Class i use to print the Images:

public class ViewImage extends JPanel {
    private static final long serialVersionUID = 1L;
    protected Image image = null;

    public ViewImage(int x, int y, String path) {
        this(x, y, new ImageIcon(path).getImage());
    }

    public ViewImage(int x, int y, Image image) {
        this.image = image;
        this.setBounds(x, y, image.getWidth(null), image.getHeight(null));
    }

    public void paintComponent(Graphics g) {
        int x = ((this.getWidth() - image.getWidth(null)) / 2);
        int y = ((this.getHeight() - image.getHeight(null)) / 2);

        g.drawImage(image, x, y, null);
    }

    public void setImage(String path) {
        this.image = new ImageIcon(path).getImage();
    }
 }

My Images are all part of the classpath an i call them with:

this.getClass().getClassLoader().getResource("MyImage.png").getPath()

Works fine until i package my programm into a jar file and run it from console with:

java -jar MyJar.jar

My programm starts well but no image are printed. No Exceptions, no Errors, nothing.

What can cause such an behaviour?

It could be the location of MyImage.png in the jar-file. Could you unzip the jar-file, and provide a listing of its directory structure? — Henrik Aasted Sørensen
– Henrik Aasted Sørensen, Commented Aug 15, 2013 at 9:53
My Images are all in the root directory when i unpack my jar next to the source-folder and the META-INF — Mulgard
– Mulgard, Commented Aug 15, 2013 at 9:58
Cannot you use getResourceAsStream instead of trying to get to an actual file? — Thilo
– Thilo, Commented Aug 15, 2013 at 9:59
@MarcTigges : Please have a look at this answer. Hopefully it might be able to help you too :-) The way you using 'ImageIcon`, it is bound to silently do away with any alarms, that the code might encounter :-) Last link in that post will definitely help you, if you doing it without an IDE :-) — nIcE cOw
– nIcE cOw, Commented Aug 15, 2013 at 10:01

Luca Basso Ricci · Accepted Answer · 2013-08-15 09:59:21Z

4

Before all be sure your resource is correctly loaded (for example with a System.out())!

Instead to use ImageIcon(String location) use ImageIcon(URL location) constructor because your image is not on hdd, but live compressed as URL in your classpath (something like MyJar.jar!/path/to/image.png"); you have to modify your image loading as

this.getClass().getClassLoader().getResource("MyImage.png");

answered Aug 15, 2013 at 9:59

Luca Basso Ricci

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Comments

davidfrancis · Accepted Answer · 2013-08-15 10:19:31Z

1

The ".getPath()" part of your code excludes the leading part of the URL.
This needs to be present if your resource is part of a jar file.

I suggest you remove the ".getPath()" and use the full URL.
Printing out the full URL is a good idea too, in a System.out.println for example.

answered Aug 15, 2013 at 10:19

davidfrancis

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