void-generator appears to silently fail for localhost SPARQL endpoints

[mdrishti]

I am using the following command for generating void description for a Qlever generated SPARQL endpoint on localhost.

java -jar target/void-generator-0.19-uber.jar -r "http://localhost:7036/" --void-file void-metrin-kg-v1.ttl -i "http://localhost:7036/.well_known/void#"  --optimize-for Qlever

The above does not throw any error:

[main] INFO swiss.sib.swissprot.servicedescription.Generate - Optimizing for backing store: Qlever
[main] INFO swiss.sib.swissprot.servicedescription.Generate - Queries 4 / 5 
[main] INFO swiss.sib.swissprot.servicedescription.Generate - Ran 5 queries

It produces a small void file (example below), which appears to be incomplete, given that the Qlever indexed KG also contains example file generated using sparql-editor.

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix void: <http://rdfs.org/ns/void#> .
@prefix : <http://www.w3.org/ns/sparql-service-description#> .
@prefix void_ext: <http://ldf.fi/void-ext#> .
@prefix formats: <http://www.w3.org/ns/formats/> .
@prefix pav: <http://purl.org/pav/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix dcterms: <http://purl.org/dc/terms/> .

<http://localhost:7036/> a :Service;
  :defaultDataset <http://localhost:7036/#sparql-default-dataset>;
  :endpoint <http://localhost:7036/>;
  :resultFormat formats:SPARQL_Results_CSV, formats:SPARQL_Results_JSON, formats:N-Triples,
    formats:RDF_XML, formats:SPARQL_Results_TSV, formats:Turtle, formats:SPARQL_Results_XML;
  :supportedLanguage :SPARQL11Query;
  :feature :UnionDefaultGraph, :BasicFederatedQuery;
  :availableGraphs <http://localhost:7036/.well_known/void##sparql-graph-collection> .

<http://localhost:7036/#sparql-default-dataset> a :Dataset;
  :defaultGraph <http://localhost:7036/.well_known/void##sparql-default-graph> .

<http://localhost:7036/.well_known/void##sparql-default-graph> a :Graph;
  void:distinctObjects "99723292"^^xsd:long;
  void_ext:distinctLiterals "19197485"^^xsd:long;
  void_ext:distinctIRIReferenceObjects "80525807"^^xsd:long;
  void:distinctSubjects "72839263"^^xsd:long;
  void_ext:distinctIRIReferenceSubjects "71581636"^^xsd:long;
  void_ext:distinctBlankNodeSubjects "1257627"^^xsd:long .