The DBpedia response has a processing directive:
<?xml version="1.1" ?>
not XML "1.0" (or default) Setting it to "1.0" and I worked for me. I
don't see any XML 1.1 feature being used.
It fails because there is no XML 1.1 parser registered.
((The results aren't schema conforming anyway distinct= and ordered=
aren't in the standard, not that it is checked))
There aren't many XML 1.1 parsers about and the uptake of XML 1.1 is
low. There are issues due to the strictness for character sets in XML
parsing - invalid documents becoming valid is a big deal of that
document is a business process document i.e. $$$ is involved and its a
security issue.
Anyone know how to ignore the processing directive and have Jena setup
the parser factory anyway?
Workaround: use a different like the JSON format.
Andy
On 13/05/15 12:27, Jeremy Debattista wrote:
Hi Rob,
Yes that is what I suspect as well, even though when I use a curl function with
content negotiation [1], the returned results look good (and well formed).
Anyway, this is the complete error stack:
com.hp.hpl.jena.sparql.resultset.ResultSetException: Failed when initializing
the StAX parsing engine
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX.<init>(XMLInputStAX.java:119)
at com.hp.hpl.jena.sparql.resultset.XMLInput.make(XMLInput.java:73)
at com.hp.hpl.jena.sparql.resultset.XMLInput.fromXML(XMLInput.java:42)
at com.hp.hpl.jena.sparql.resultset.XMLInput.fromXML(XMLInput.java:37)
at
com.hp.hpl.jena.query.ResultSetFactory.fromXML(ResultSetFactory.java:312)
at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:372)
at
de.unibonn.iai.eis.linda.helper.SPARQLHandler.executeQuery(SPARQLHandler.java:41)
at
de.unibonn.iai.eis.linda.helper.SPARQLHandler.getLabelFromNode(SPARQLHandler.java:80)
at
de.unibonn.iai.eis.linda.querybuilder.classes.RDFClass.<init>(RDFClass.java:62)
at
de.unibonn.iai.eis.linda.querybuilder.classes.RDFClass.searchRDFClass(RDFClass.java:228)
at
de.unibonn.iai.eis.linda.querybuilder.classes.RDFClass.searchRDFClass(RDFClass.java:222)
at com.servlet.routes.BuilderRoute.getProperties(BuilderRoute.java:172)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
Cheers,
Jeremy
[1] curl -H "Accept: application/sparql-results+xml" -g
"http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=PREFIX+rdf%3A%3Chttp%3A%2F%2Fwww.w3.org%2F1999%2F02%2F22-rdf-syntax-ns%23%3E+PREFIX+rdfs%3A%3Chttp%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23%3E+PREFIX+owl%3A%3Chttp%3A%2F%2Fwww.w3.org%2F2002%2F07%2Fowl%23%3E++SELECT+distinct+%3Fclass+%3Flabel++WHERE+%7B+%7B%3Fclass+rdf%3Atype+owl%3AClass%7D+UNION+%7B%3Fclass+rdf%3Atype+rdfs%3AClass%7D.+%3Fclass+rdfs%3Alabel+%3Flabel.+++FILTER%28bound%28%3Flabel%29++%26%26+REGEX%28%3Flabel%2C+%22%5C%5Cbact%22%2C%22i%22%29%29%7D+ORDER+BY+%3Fclass%0D%0A”
On 13 May 2015, at 12:32, Rob Vesse <[email protected]> wrote:
What is the error message you get?
It is not unheard of for Virtuoso (the software that powers DBPedia) to
produce bad output particularly if the data has not been appropriately
sanitised so I would suspect Virtuoso before suspecting Jena in a case
like this
Rob
On 13/05/2015 10:16, "Jeremy Debattista" <[email protected]> wrote:
Dear All,
I am trying to query the DBpedia SPARQL endpoint using the
QueryExecutionFactory sparqlService and execSelect(), but I’m given the
following error: com.hp.hpl.jena.sparql.resultset.ResultSetException:
Failed when initializing the StAX parsing engine
The query in question is
PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX
rdfs:<http://www.w3.org/2000/01/rdf-schema#> PREFIX
owl:<http://www.w3.org/2002/07/owl#> SELECT distinct ?class ?label
WHERE { {?class rdf:type owl:Class} UNION {?class rdf:type rdfs:Class}.
?class rdfs:label ?label. FILTER(bound(?label) && REGEX(?label,
"\\bact","i"))} ORDER BY ?class
which gives a result in dbpedia sparql web interface [1].
The code in question is the following:
public static ResultSet executeQuery(String uri, String queryString) {
Query query = QueryFactory.create(queryString);
QueryExecution qexec = QueryExecutionFactory.sparqlService(uri, query);
try {
ResultSet results = qexec.execSelect();
return results;
} finally {
}
}
After debugging, the problem seems to be related to how the XML parser is
reading the stream input. Would you have any other idea how I can go
around it?
Best Regards,
Jeremy
[1]
http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query
=PREFIX+rdf%3A%3Chttp%3A%2F%2Fwww.w3.org%2F1999%2F02%2F22-rdf-syntax-ns%23
%3E+PREFIX+rdfs%3A%3Chttp%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23%3
E+PREFIX+owl%3A%3Chttp%3A%2F%2Fwww.w3.org%2F2002%2F07%2Fowl%23%3E++SELECT+
distinct+%3Fclass+%3Flabel++WHERE+%7B+%7B%3Fclass+rdf%3Atype+owl%3AClass%7
D+UNION+%7B%3Fclass+rdf%3Atype+rdfs%3AClass%7D.+%3Fclass+rdfs%3Alabel+%3Fl
abel.+++FILTER%28bound%28%3Flabel%29++%26%26+REGEX%28%3Flabel%2C+%22%5C%5C
bact%22%2C%22i%22%29%29%7D+ORDER+BY+%3Fclass%0D%0A&format=text%2Fhtml&time
out=30000&debug=on
