Exported Jar file won't read file inside jar

Question

In the code sample below, when I test the code in Eclipse it works just fine. However, when I export the jar file and test it via the command line, it throws an error: IIO

Answer 1

You should try to check if your class is in the same directory than Images inside your jar.

   |
   |- Your class
   |- Images
       |- questionMark.png

Also, have you tried using directly your url object ?

File file = new File(url);

Answer 2

try this

public void test() {
    try(InputStream is = getClass().getResourceAsStream("Images/questionMark.png")) {
        ImageIO.read(is);
    } catch (IOException e) {
        e.printStackTrace();
    }
}