hello:
I got error messages as follows:
HttpException: HttpException: 500 SPARQL Request Failed: HttpException:
500 SPARQL Request Failed
com.hp.hpl.jena.sparql.engine.http.HttpQuery.execCommon(HttpQuery.java:340)
com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:190)
com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:147)
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:131)
eMSE.DBPedia.searchOnDBPedia(DBPedia.java:66)
eMSE.SemanticSearcher.doGet(SemanticSearcher.java:44)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
When excuting the following sparql query code through
"QueryExecutionFactory.sparqlService("http://dbpedia.org/sparql";, query)" :
PREFIX : <http://dbpedia.org/resource/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dbpedia: <http://dbpedia.org/property/#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT DISTINCT ?label ?abstract ?ref ?type
WHERE
{ ?x rdfs:comment ?abstract ;
rdf:type ?type ;
<http://dbpedia.org/property/reference> ?ref ;
rdfs:label ?label .
FILTER regex(?label, "semantic", "i")
}
ORDER BY ?label
what is the problem? how to solve that?
many thanks!
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