code: public boolean hasEntries()
      {
          return (getCache4Id() != null && !getCache4Id().isEmpty())
              || (getCache4Name() != null && !getCache4Name().isEmpty())
              || (getCache4UUID() != null && !getCache4UUID().isEmpty());
      }
docs: The method tests, if the cache has stored some entries.
  
  @return <i>true</i> if the cache has some entries, otherwise
  <i>false</i>