How to load the image from a jar file?

Question

This code works only if I run my project, but if I run the Jar file, I get a NullPointerException. The image is in src directory.

try {
            URL resource = Sticker.class.getResource("\\transparentSticker.png");
            img = null;
            this.img = ImageIO.read(Paths.get(resource.toURI()).toFile());
            System.out.println("c");
        } catch (IOException | URISyntaxException e) {
            System.out.println("caught");
        }

If I use this code, an IllegalArgumentException is being thrown.

InputStream input = Sticker.class.getResourceAsStream("\\transparentSticker.png");
        if (input == null) {
          
            input = Sticker.class.getClassLoader().getResourceAsStream("\\transparentSticker.png");
        }
            try {
                img = ImageIO.read(input);
            } catch (IOException e) {
                e.printStackTrace();
            }

How to load the image?

1) not sure why you are using the Paths class. The ImageIO.read(...) method will accept a URL as a parameter 2) did you include the file in your .jar file? — camickr, May 16 '21 at 19:06
The argument to getResource and getResourceAsStream is not a filename, it’s a URL. The backslash is not a legal character in a URL. You probably meant `"/transparentSticker.png"`. Also, as camickr said, don’t try to convert the URL to a file; just load the URL directly. — VGR, May 17 '21 at 22:25

score 0 · Answer 1 · answered May 16 '21 at 19:15

You did say the PNG is in the src folder?

Let's see, after reading this and this, I think it needs to be:

InputStream input = Sticker.class.getResourceAsStream("/src/transparentSticker.png");

or

URL resource = Sticker.class.getResource("/src/transparentSticker.png");

Think unix, not windows.

How to load the image from a jar file?

1 Answers1