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For some reason, the returned resource path has a '/' prefix (I think I read somewhere this is a known Java bug).
I used this code to solve it:

String url1 = getClass().getResource("/resources/lena.png").getPath();
if (url1.startsWith("/", 0))
        url1=url1.replaceFirst("/", "");

For some reason, the returned resource path has a '/' prefix (I think I read somewhere this is a known Java bug).bug). Plus, the code cannot handle %20 (space) in the url.
I used this code to solve it:

try{
    String url1 = getClass().getResource("/resources/lena.png").getPath();
 if (url1.startsWith("/", 0))
         url1=url1.replaceFirst("/", "");
    url1=URLDecoder.decode(url1, "UTF-8"); //this will replace %20 with spaces
    Mat image = Highgui.imread(url1); 
}
catch ...

For some reason, the returned resource path has a '/' prefix (I think I read somewhere this is a known Java bug). Plus, the code cannot handle %20 (space) in the url.
I used this code to solve it:

try{
    String url1 = getClass().getResource("/resources/lena.png").getPath();
     if (url1.startsWith("/", 0))
        url1=url1.replaceFirst("/", "");
    url1=URLDecoder.decode(url1, "UTF-8"); //this will replace %20 with spaces
    Mat image = Highgui.imread(url1); 
}
catch ...