docs: private void connectReferences() {
          // ready to associate initalized beans with references
          for (Bean bean : beans.values()) {
              for (JpaRef ref : refs.get(bean.getId())) {
                  BeanId target = ref.getTarget();
                  Bean targetBean = beans.get(target);
                  target.setBean(targetBean);
                  bean.addReference(ref.getPropertyName(), target);
              }
          }
      }