code: public String getResourceType(Class<?> clazz) {
  		RegistryEntry entry = getEntry(clazz, true);
  		if (entry == null) {
  			return null;
  		}
  		ResourceInformation resourceInformation = entry.getResourceInformation();
  		if (resourceInformation == null) {
  			return null;
  		}
  		return resourceInformation.getResourceType();
  	}
docs: Returns a JSON API resource type used by Katharsis. If a class cannot be
  found, <i>null</i> is returned. The value is fetched from
  {@link ResourceInformation#getResourceType()} attribute.
  
  @param clazz
  resource class
  @return resource type or null