Cannot retrieve image by relative path

Question

I am trying to retrieve a picture by relative path but it always returns a java.lang.NullPointerException no matter what path combination I try

private final Icon cardBack = new ImageIcon(getClass().getResource(
    "src/main/resources/Images/cardIcons/cardBack.png"));

https://pastebin.com/sDjP87p3

Answer 1

private final Icon cardBack = new ImageIcon(getClass().getResource("/Images/cardIcons/cardBack.png"));

Worked after I remade the app into a normal java project. Apparently the problem was caused by Maven, cause yet unknown.