Get a resource using getResource()

Question

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?

Whitherward

Answer 1

TestGameTable.class.getResource("/unibo/lsb/res/dice.jpg");

• leading slash to denote the root of the classpath
• slashes instead of dots in the path
• you can call getResource() directly on the class.

Enslave

Just be aware that Class#getResource and ClassLoader#getResource are using different strategies to map the name to a location. LucaB's example actually uses the ClassLoader from Class<java.lang.Class> (SomeClass.class.getClass()), but that's probably a mistake and not on purpose. – Ingoing

@jambjo yes, I assumed it's a mistake. – Enslave

It is a mistake. Thanks for the hint – Whitherward

I tested it but this returned null. I wrote like that: MyClass.class.getResource("/WebContent/WEB-INF/xsd/MyXsd.xsd"). any mistake I did? – Korrie

Answer 2

Instead of explicitly writing the class name you could use

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

Sublunary

Or just getClass() without this. – Decant

This is assuming you are not within a static context. – Limen

Answer 3

if you are calling from static method, use :

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

Clog

what about if calling other than static method? – Addiel

Answer 4

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

Granddaughter

The .class file is not necessarily stored in the file system directly. It may also be part of a .jar file... – Decongestant

I remarked that TestGameTable.class.getClassLoader().getResource("dice.jpg"); worked in packaged App/jar but getClass().getResource("/unibo/lsb/res/dice.jpg"); didn't work. – Ancestral