public BuscaAvancadaBean() {

    Neo4jRepository nRepository = new Neo4jRepository();
    SPARQLRepository sRepository = new SPARQLRepository();

    this.endpoints = nRepository.findEndpointsURIs();
    links1 = new ArrayList<String>();
    linksWithOU(false);
    links2 = new ArrayList<String>();
    linksWithOPTIONAL();

    if (sRepository.endpointOn(this.endpoint)) {
      this.status = "On";
    } else {
      this.status = "Off";
    }
    this.predicates = nRepository.retrieveEndpointData(this.endpoint);
  }