Hi there,
I'm trying to query dbpedia for a list of company names. I'm
inconsistently getting WstxEOFException's caught by jena, which then
raises a ResultSetException. This happens after some data has been read
successfully. Following the tcp stream in wireshark shows a complete
response from the dbpedia server.
Is this a bug in woodstox? I've tried replacing the libs with wstx4 and
stax2, but same error occurred. Is there anything I'm doing wrong/badly
with jena/sparql? (I'm relatively new to this). The minimal test case
below seems to reproduce the error (output also below) reliably. I've
tried this on both windows7 and OS X 10.6 from different locations.
Could you check to see if you get the same error?
Any ideas?
Many thanks,
Simon Wibberley
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.RDFNode;
public class TestJena {
public static void main(String[] args) {
String queryString = "PREFIX rdf:
<http://www.w3.org/1999/02/22-rdf-syntax-ns#>"
+ "PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>"
+ "SELECT ?var "
+ "WHERE { ?var rdf:type dbpedia-owl:Company . }";
Query query = QueryFactory.create(queryString);
QueryExecution qexec = QueryExecutionFactory.sparqlService(
"http://dbpedia.org/sparql";, query);
ResultSet rs = null;
rs = qexec.execSelect();
qexec.close();
while(rs.hasNext()) {
QuerySolution sqs = rs.next();
RDFNode node = sqs.get("var");
System.out.println(node);
}
}
}
com.ctc.wstx.exc.WstxEOFException: Unexpected EOF; was expecting a close
tag for element <uri>
at [row,col {unknown-source}]: [106,47]
at
com.ctc.wstx.sr.StreamScanner.throwUnexpectedEOF(StreamScanner.java:686)
at
com.ctc.wstx.sr.BasicStreamReader.nextFromTree(BasicStreamReader.java:2730)
at com.ctc.wstx.sr.BasicStreamReader.next(BasicStreamReader.java:1019)
at
com.ctc.wstx.sr.BasicStreamReader.getElementText(BasicStreamReader.java:669)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.getOneSolution(XMLInputStAX.java:480)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.hasNext(XMLInputStAX.java:216)
at sw206.TestJena.main(TestJena.java:31)
Exception in thread "main"
com.hp.hpl.jena.sparql.resultset.ResultSetException: XMLStreamException:
Unexpected EOF; was expecting a close tag for element <uri>
at [row,col {unknown-source}]: [106,47]
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.staxError(XMLInputStAX.java:510)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.hasNext(XMLInputStAX.java:220)
at sw206.TestJena.main(TestJena.java:31)
Caused by: com.ctc.wstx.exc.WstxEOFException: Unexpected EOF; was
expecting a close tag for element <uri>
at [row,col {unknown-source}]: [106,47]
at
com.ctc.wstx.sr.StreamScanner.throwUnexpectedEOF(StreamScanner.java:686)
at
com.ctc.wstx.sr.BasicStreamReader.nextFromTree(BasicStreamReader.java:2730)
at com.ctc.wstx.sr.BasicStreamReader.next(BasicStreamReader.java:1019)
at
com.ctc.wstx.sr.BasicStreamReader.getElementText(BasicStreamReader.java:669)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.getOneSolution(XMLInputStAX.java:480)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.hasNext(XMLInputStAX.java:216)
... 1 more
22:59:25,250 WARN XMLInputStAX$ResultSetStAX:73 - StAX error:
XMLStreamException: Unexpected EOF; was expecting a close tag for
element <uri>
at [row,col {unknown-source}]: [106,47]
com.ctc.wstx.exc.WstxEOFException: Unexpected EOF; was expecting a close
tag for element <uri>
at [row,col {unknown-source}]: [106,47]
at
com.ctc.wstx.sr.StreamScanner.throwUnexpectedEOF(StreamScanner.java:686)
at
com.ctc.wstx.sr.BasicStreamReader.nextFromTree(BasicStreamReader.java:2730)
at com.ctc.wstx.sr.BasicStreamReader.next(BasicStreamReader.java:1019)
at
com.ctc.wstx.sr.BasicStreamReader.getElementText(BasicStreamReader.java:669)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.getOneSolution(XMLInputStAX.java:480)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.hasNext(XMLInputStAX.java:216)
at sw206.TestJena.main(TestJena.java:31)
