code: public URL resolve(String resource, Class consumer){
  
          final ClassLoader ccl = Thread.currentThread().getContextClassLoader();
          final String resourcePath = resolvePath(resource, consumer);
          URL contentUrl = null;
          if (ccl != null) {
              contentUrl = ccl.getResource(resourcePath);
          }
          if (contentUrl == null) {
              contentUrl = consumer.getResource(resourcePath);
          }
          if(failOnMissingResource && contentUrl == null){
              throw new AssertionError("Resource " + resource + " not found");
          }
          return contentUrl;
      }
docs: Resolves a URL of the resource specified using the provided class as hint to start the search. For searching
  the resource the consumer's classloader is used.
  @param resource
  the path the resource. The path can be either absolute or relative to the consumers location.
  @param consumer
  the consumer class of the resource. It's classloader is used for the lookup and it's location is used
  as reference point for resolving relative path names
  @return
  a URL to the resolved resource