how i change default concentration idol java?

i'm controlling netbeans, perplexing change informed java coffee void idol png record i have saved resources office jar file. i've found opposite web pages explain have solution, nonetheless distant zero work.

here's i have during impulse (leaving out try-catch block):

url url = new url("com/xyz/resources/camera.png");
toolkit container = toolkit.getdefaulttoolkit();
image img = kit.createimage(url);
getframe().seticonimage(img);

the category contains formula com.xyz package, creates any difference. category also extends jframe. formula throwing malformedurlexception initial line.

anyone have fortitude works?