title: getClass().getResource(resourcePath) valid on windows, null on Linux
body: <p>I have a problem, this call</p>
  
  <p>URL fileURL = getClass().getResource(resourcePath);</p>
  
  <p>works on Windows (7 64b) but not on linux (Ubuntu 13.10 64b) where it returns null.</p>
  
  <p>Why? File is there and the string is the following (relative path)</p>
  
  <pre><code>String resourcePath = "/tut01/shaders/vertex_shader.glsl"
  </code></pre>
  
  <p>Both file are in my home</p>
  
  <p>Edit: The project was freshly cloned and I forgot to clean &amp; build, sorry for that.. So now it founds them. However it is strange because even if I modify, let's say, the vertex_shader.glsl, my program will refer always to the old version, every time I edit it, I need to do clean &amp; build in order to see the changes... Why? On windows I don't have to do that..</p>