What version of woodstox?
On Tue, Feb 8, 2011 at 8:37 AM, Andy Seaborne <[email protected]> wrote: > Simon, > > Thanks for a complete, minimal example. I get the same error. > > I suspect it's not woodstox per se, but a lower level networking issue > because I can get things to work by reading the data as fast as possible. > Maybe woodstow's use of the inputstream is seeing the connection close flag > without making sure there isn't more data to read. > > The code in ARQ SVN has a workaround for this - it slurps up the network > bytes as fast as possible, then passes them to woodstox; woodstox is not > then working over the network input stream but instead a > ByteArrayInputStream. > > (An alternative, I tried was adding a buffering layer to the input stream > but that didn't work). > > Andy > > On 07/02/11 23:09, Simon Wibberley wrote: >> >> 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) >> >> >> >> >
