[java] Get a resource using getResource()

I need to get a resource image file in a java project. What I'm doing is:

URL url = TestGameTable.class.getClass().
          getClassLoader().getResource("unibo.lsb.res/dice.jpg");

The directory structure is the following:

unibo/
  lsb/
    res/
      dice.jpg
    test/
    ..../ /* other packages */

The fact is that I always get as the file doesn't exist. I have tried many different paths, but I couldn't solve the issue. Any hint?

Instead of explicitly writing the class name you could use

this.getClass().getResource("/unibo/lsb/res/dice.jpg");

One thing to keep in mind is that the relevant path here is the path relative to the file system location of your class... in your case TestGameTable.class. It is not related to the location of the TestGameTable.java file.
I left a more detailed answer here... where is resource actually located

if you are calling from static method, use :

TestGameTable.class.getClassLoader().getResource("dice.jpg");