* interfaces.
* @param entityClass the class
*/
private void findFields(Class<?> entityClass) {
for (Field f: entityClass.getDeclaredFields()) {
Ref a = f.getAnnotation(Ref.class);
if (a != null) {
Class<?> t = f.getType();
if (t.equals(String.class) || t.equals(URI.class)) {
if (!linkFields.containsKey(f.getName())) {
linkFields.put(f.getName(), new RefFieldDescriptor(f, a, t));