in src/main/java/com/amazonaws/neptune/client/rdf4j/NeptuneSparqlRepository.java [75:83]
public NeptuneSparqlRepository(final String endpointUrl) {
super(getSparqlEndpoint(endpointUrl));
// all the fields below are only relevant for authentication and can be ignored
this.authenticationEnabled = false;
this.endpointUrl = null; // only needed if auth is enabled
this.awsCredentialsProvider = null; // only needed if auth is enabled
this.regionName = null; // only needed if auth is enabled
}