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https://issues.apache.org/jira/browse/JENA-466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13674216#comment-13674216
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Andy Seaborne edited comment on JENA-466 at 6/4/13 10:13 AM:
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You have created an ASK query but used execDescribe() -- you want execAsk().
The result of an ASK query is not an RDF model but one of the result set
formats. So the remote endpoint is correctly returning
application/sparql-results+xml, and you can't treat that as an RDF model.
BTW: You don't have to QueryEngineHTTP directly - the public API of
QueryExecutionFactory has createRemote operations.
Similarly, SPARQLResult is mainly an internal class.
was (Author: andy.seaborne):
You have created an ASK query but used execDescribe() -- you want execASK().
The result of an ASK query is not an RDF model but one of the result set
formats. So the remote endpoint is correctly returning
application/sparql-results+xml, and you can't treat that as an RDF model.
BTW: You don't have to QueryEngineHTTP directly - the public API of
QueryExecutionFactory has createRemote operations.
Similarly, SPARQLResult is mainly an internal class.
> a QueryEngineHTTP doesn't handle the returned content type after an
> execModel() call.
> -------------------------------------------------------------------------------------
>
> Key: JENA-466
> URL: https://issues.apache.org/jira/browse/JENA-466
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 2.10.0
> Reporter: ArthurVaisse-Lesteven
> Labels: ASK, Jena-2.10.0, QueryEngineHTTP, content-type
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> When executing this simple piece of code :
> public class test {
> public static void main(String[] argv){
> String request = "Ask from <http://example.com#graphe> where
> {<http://example.com#ProofOfConcept> ?p ?o}";
> String endpoint = "http://localhost:3030/ds/query";;
> Query query;
> try{
> query = QueryFactory.create(request);
> }
> catch(Exception e){
> throw e;
> }
> QueryEngineHTTP query_engine = new QueryEngineHTTP(endpoint,
> query);
> try{
> SPARQLResult spqlr = new
> SPARQLResult(query_engine.execDescribe());
> }
> finally{
> query_engine.close();
> }
> }
> }
> I got the following exception :
> Exception in thread "main" com.hp.hpl.jena.query.QueryException: Endpoint
> returned Content Type: application/sparql-results+xml which is not a valid
> RDF Graph syntax
> at
> com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execModel(QueryEngineHTTP.java:275)
> at
> com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execDescribe(QueryEngineHTTP.java:251)
> at
> com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execDescribe(QueryEngineHTTP.java:248)
> at test.main(test.java:29)
> The same error occurs when I change the endpoint to a Sesame repository. So I
> think the problem come from the code who receive the repository response and
> check content type. He probably wait another content type.
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