private @Nullable List<RuntimeConfigurationProducer> findPreferredProducers() {
    if (myPreferredProducers == null) {
      myPreferredProducers = PreferredProducerFind.findPreferredProducers(myLocation, this, true);
    }
    return myPreferredProducers;
  }
private @Nullable List<RuntimeConfigurationProducer> findPreferredProducers()