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I don't have "splash_screen.png" on my PC, so when I ran your code I got the same blank JFrame as you. But when I created my own "splash_screen.png" inside src/images/ and loaded it with...

First verify that your 'background' label is where you expect it to be:



background = new JLabel(backgroundImage);
background.setPreferredSize(new Dimension(75, 75));
background.setBorder(new...