java - DBpedia Jena Query returning null -

i'm trying run small query on dbpedia, query works, see here, don't why returning when doing jena, i'm getting null.

string service = "http://dbpedia.org/sparql"; string querystring = ""; querystring = "prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> select ?label" +         "where {" +         "<http://dbpedia.org/resource/quatre_bornes> <http://dbpedia.org/ontology/country> ?y ."+         "?y rdfs:label ?label ."+          "filter (lang(?label) = 'en')"+         "}";  query query = queryfactory.create(querystring); queryenginehttp qexec = queryexecutionfactory.createservicerequest(service, query); resultset results = qexec.execselect(); ( ; results.hasnext() ; ) {     querysolution soln = results.nextsolution() ;     system.out.println(soln.getliteral("label")); } 

any suggestion?

that embarassing, there space problem in query:

string service = "http://dbpedia.org/sparql";         string querystring = "";         querystring = "prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> select ?label " +             "where {" +              "<http://dbpedia.org/resource/quatre_bornes> <http://dbpedia.org/ontology/country> ?y ."+              "?y rdfs:label ?label ."+               "filter (lang(?label) = 'en')"+             "}";