Problem of querying dbpedia endpoint

[朱曼]

Dear list,

hi~~

I encounter "HttpException: java.net.SocketException: Connection reset:
java.net.SocketException: Connection reset" exception when I run the
following code, could you help me?

        try {
            Model dbpedia_model = ModelFactory.createDefaultModel();
            String queryStr = "SELECT distinct ?c WHERE { ?c a owl:Class }";
            Query query = QueryFactory.create(queryStr);
            query.addGraphURI("http://dbpedia.org/";);
            QueryExecution qexec = QueryExecutionFactory.sparqlService("
http://dbpedia.org/sparql";, query);
            ResultSet rs = qexec.execSelect();
            ResultSetFormatter.out(System.out, rs, query);
            qexec.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

all the best

June