Question

我正在尝试在JAVA中执行SPARQL查询，但在.execSelect（）方法中得到了异常

我正在使用Apache Jena执行查询。我在pom.xml中添加的依赖项是

<dependency>
  <groupId>org.apache.jena</groupId>
  <artifactId>apache-jena-libs</artifactId>
  <type>pom</type>
  <version>3.0.0</version>
</dependency>

<dependency>
  <groupId>org.apache.jena</groupId>
  <artifactId>jena-text</artifactId>
  <version>3.0.0</version>
</dependency>

我正在尝试的代码（此查询在Virtuoso SparQL Query editor上完美运行）

String queryStr = "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>\n" + 
            "PREFIX dbr: <http://dbpedia.org/resource/>\n" + 
            "SELECT ?uri ?label \n" + 
            "    WHERE {?uri  <http://purl.org/dc/terms/subject> ?categories .\n" + 
            "?categories rdfs:label ?label\n" + 
            "    FILTER (?uri = dbr:Holy_Roman_Empire || ?uri = dbr:Part-of-speech_tagging || ?uri = dbr:Alt-Berlin || ?uri = dbr:Named-entity_recognition)\n" + 
            "    FILTER (lang(?label) = 'en' || lang(?label) = 'de')\n" + 
            "}\n" + 
            "ORDER BY DESC(?uri)";

        Query query = QueryFactory.create(queryStr); 
        QueryExecution qExe = QueryExecutionFactory.sparqlService( "http://dbpedia.org", query );
        ResultSet results = qExe.execSelect();
        ResultSetFormatter.out(System.out, results, query) ;

我在qExe.execSelect（）中得到的异常；是

线程“主”中的异常java.lang.NoSuchMethodError：org.apache.http.client.utils.URLEncodedUtils.format（Ljava / lang / Iterable; Ljava / nio / charset / Charset;）Ljava / lang / String;

我缺少一些依赖吗？

无法在Java中执行SPARQL查询（QueryExecution .execSelect（）方法中的异常）

0 个答案: