This SPARQL query no longer works, any ideas why? - Wikidata

25 Jan 2016

Wikidata SPARQL aficionados,

This SPARQL query worked for several weeks, but quit working a few days
ago:

      PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
      PREFIX wikibase: <http://wikiba.se/ontology#>
      PREFIX entity: <http://www.wikidata.org/entity/>
      PREFIX p: <http://www.wikidata.org/prop/direct/>

      SELECT ?propUrl ?propLabel ?valUrl ?valLabel
      WHERE {
        hint:Query hint:optimizer 'None' .
        entity:Q42 ?propUrl ?valUrl .
        ?valUrl rdfs:label ?valLabel

        FILTER (LANG(?valLabel) = 'en') .

        ?property ?ref ?propUrl .
        ?property a wikibase:Property .
        ?property rdfs:label ?propLabel

        FILTER (lang(?propLabel) = 'en' )
        }
      ORDER BY ?propUrl ?valUrl LIMIT 100

Here is the first part of the exception:

java.util.concurrent.ExecutionException:
java.util.concurrent.ExecutionException:
org.openrdf.query.QueryEvaluationException: java.lang.RuntimeException:
java.util.concurrent.ExecutionException: java.lang.RuntimeException:
java.util.concurrent.ExecutionException: java.lang.Exception:
task=ChunkTask{query=7be8b715-1429-4348-bf97-237d06d6084c,bopId=17,partitionId=-1,sinkId=19,altSinkId=null},
cause=java.util.concurrent.ExecutionException:
java.lang.RuntimeException:
com.bigdata.rdf.internal.NotMaterializedException: Vocab(6)

Any ideas on how I can modify the query to work again?

Please advise,
James Weaver