code: public boolean isPersistentProperty(String propName) {
          if (transientProperties == null) {
              setTransientPropertyNames();
          }
          if (transientProperties.contains(propName)) {
              return false;
          } else {
              return true;
          }
      }
docs: Returns true if the provided property is a persistent property; false, otherwise.
  
  @return
  returned object is {@link boolean}