SPARQL查询不检索java中的结果

import org.apache.jena.query.*;

public class SPARQLQueryExample {
    public static void main(String[] args) {
        // 创建一个查询
        String queryString = "SELECT ?subject ?predicate ?object WHERE { ?subject ?predicate ?object }";
        Query query = QueryFactory.create(queryString);

        // 创建一个查询执行器
        try (QueryExecution qexec = QueryExecutionFactory.sparqlService("http://example.com/sparql-endpoint", query)) {
            // 执行查询并获取结果集
            ResultSet results = qexec.execSelect();

            // 处理结果集
            while (results.hasNext()) {
                QuerySolution soln = results.nextSolution();
                RDFNode subject = soln.get("subject");
                RDFNode predicate = soln.get("predicate");
                RDFNode object = soln.get("object");
                System.out.println(subject + " " + predicate + " " + object);
            }
        }
    }
}