Oh, I changed Prefix from "PREFIX dbpedia: http://dbpedia.org/"; to "PREFIX dbpedia: <http://dbpedia.org/resource/>"
the error also changed as below: HttpException: java.net.SocketException: Connection reset: java.net.SocketException: Connection reset at com.hp.hpl.jena.sparql.engine.http.HttpQuery.execCommon(HttpQuery.java:529) at com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:289) at com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:240) at com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:302) at Dbpedia.GetFromSparql.SearchSparql(GetFromSparql.java:42) at Dbpedia.GetFromSparql.main(GetFromSparql.java:53) Caused by: java.net.SocketException: Connection reset at java.net.SocketInputStream.read(SocketInputStream.java:168) at java.io.BufferedInputStream.fill(BufferedInputStream.java:218) at java.io.BufferedInputStream.read1(BufferedInputStream.java:258) at java.io.BufferedInputStream.read(BufferedInputStream.java:317) at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:687) at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:632) at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:652) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1064) at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:373) at com.hp.hpl.jena.sparql.engine.http.HttpQuery.execCommon(HttpQuery.java:412) ... 5 more How can I do ? 发件人： Marco Neumann 发送时间： 2013-09-02 18:46 收件人： users 主题： Re: JENA API question change dbpedia prefix to "PREFIX dbpedia: <http://dbpedia.org/resource/>" + On Mon, Sep 2, 2013 at 5:37 AM, bocai <[email protected]> wrote: > Hi, > I want to access remote sparql endpoint throuth JENA API. My program is > below. > After I ran the program, There is no record in resultset > ----- > | p | > ===== > ----- > But I visit http://dbpedia.org/sparql and ran this sparql ( select * > where {?p dbpedia-owl:country dbpedia:Germany.} LIMIT 10 ) as same as > sparql in my program, I can get the result i want > > p > http://dbpedia.org/resource/%C3%96lsen > http://dbpedia.org/resource/%C3%96stringen > http://dbpedia.org/resource/%C3%9Cbach-Palenberg > http://dbpedia.org/resource/%C3%9Cberherrn > http://dbpedia.org/resource/%C3%9Cdersdorf > http://dbpedia.org/resource/%C3%9Chlingen-Birkendorf > http://dbpedia.org/resource/%C3%9Crzig > http://dbpedia.org/resource/16_Blocks > http://dbpedia.org/resource/18_%E2%80%93_Allein_unter_M%C3%A4dchen > http://dbpedia.org/resource/2011_German_Grand_Prix > > > Can you point out my error? thanks very much! > > public static void SearchSparql(){ > try { > String queryStr = > "PREFIX dbpedia: <http://dbpedia.org/>" + > "PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>" + > "select * where {?p dbpedia-owl:country dbpedia:Germany.} LIMIT 10"; > > Query query = QueryFactory.create(queryStr); > QueryExecution qexec = QueryExecutionFactory.sparqlService(" > http://dbpedia.org/sparql";, query); > ((QueryEngineHTTP)qexec).addParam("timeout", "10000") ; > ResultSet rs = qexec.execSelect(); > ResultSetFormatter.out(System.out, rs, query); > qexec.close(); > } catch (Exception e) { > e.printStackTrace(); > } > > } > > > - --- Marco Neumann KONA
