The XML processing is inside the class ResultSetFormatter available from
Jena API. I'm not sure if it's parse with XML DOM or SAX.
Logs are here :
at
org.openjena.atlas.io.IndentedWriter.write(IndentedWriter.java:128)
at
org.openjena.atlas.io.IndentedWriter.printOneChar(IndentedWriter.java:123)
at org.openjena.atlas.io.IndentedWriter.print(IndentedWriter.java:87)
at
com.hp.hpl.jena.sparql.resultset.XMLOutputResultSet.printLiteral(XMLOutputResultSet.java:182)
at
com.hp.hpl.jena.sparql.resultset.XMLOutputResultSet.printBindingValue(XMLOutputResultSet.java:148)
at
com.hp.hpl.jena.sparql.resultset.XMLOutputResultSet.binding(XMLOutputResultSet.java:132)
Jena API provide way to add the stylesheet inside the XML (xsl:reference)
but not to directly run the XML with the XSL.
That's wy I firstly write the XML file (a result set serialization) , and
then run a SAX processor with a stylesheet. The output is a JSON file.
Brice
2013/6/6 Claude Warren <[email protected]>
> I have not followed this discussion very closely so please excuse any items
> that have already been discussed.
>
> You state you are serializing the result set to XML apply a style sheet and
> output as json.
>
> Does your XML processing use the XML Dom or SAX processor? (DOM results in
> a memory footprint of approx 3x document size) You can run the Style sheet
> processing directly agains the SAX processor and have a minimal footprint.
>
> Does your stylesheet output the JSON or do you use an XML to JSON
> converter? If the latter, is does it use or can it use streaming like the
> SAX parser does?
>
> Claude
>
>
> On Thu, Jun 6, 2013 at 1:28 PM, Brice Sommacal <[email protected]
> >wrote:
>
> > Hi Olivier,
> >
> > Thanks for the tips for using your library.
> > It may be useful one day.
> > Can I have a look at it? I'm wondering how the n3 graph is read (from a
> > file?)
> > Is it possible to manage an other data source from? like a RDF Store?
> >
> > For my case, my code is inside a java servlet and I don't manage to set
> up
> > the application with data from a IHM. So there is no way to use a
> > javascript library (not yet ;-))
> >
> > Thanks anyway,
> >
> >
> > Brice
> >
> >
> > 2013/6/5 Olivier Rossel <[email protected]>
> >
> > > i have a small javascript that converts a n3 graph into a javascript
> > graph
> > > of objects.
> > > if your problem is related to XML stuff and such a lib could help, let
> me
> > > know.
> > > (it might be interesting to contribute it directly to exhibit, btw)
> > >
> > >
> > > On Wed, Jun 5, 2013 at 6:13 PM, Brice Sommacal <
> [email protected]
> > > >wrote:
> > >
> > > > Hello everyone,
> > > >
> > > > I'm facing a "java.lang.OutOfMemoryError: GC overhead limit exceeded"
> > > error
> > > > and I would like an advice about how I could optimize my code.
> > > >
> > > > The aim of this method is to run a SPARQL query, convert it on a XML
> > > format
> > > > and then apply a XSL stylesheet[1] to write a JSON format (readable
> by
> > > > Exhibit - Scripted [2]).
> > > >
> > > > My piece of code was working well untill today. (I have been trying
> to
> > > > query a big model and the query returns too much results).
> > > > This makes my program break.
> > > >
> > > > <quote>
> > > > Query queryToExec = QueryFactory.create(query, Syntax.syntaxARQ);
> > > > QueryExecution qexec = QueryExecutionFactory.create(queryToExec,
> > ontoIn);
> > > > ResultSet result = null;
> > > > BufferedOutputStream buf;
> > > > try{
> > > > result = qexec.execSelect();
> > > > buf = new BufferedOutputStream(new FileOutputStream(new File(root +
> > > > "XML/JSON_XML/"+qNameClass+".xml")));
> > > > //Serialization of the resultSet
> > > > ResultSetFormatter.outputAsXML(buf, result);
> > > > buf.close();
> > > > }
> > > > catch (Exception e) {
> > > > e.printStackTrace();
> > > > }
> > > > finally{
> > > > qexec.close();
> > > > }
> > > > </quote>
> > > >
> > > > I know that writing XML file use loads memory....
> > > >
> > > > I was thinking of:
> > > > - creating several XML files by tracing the ResullSetFormatter
> memory
> > > > usage. (is there possible?)
> > > > - avoiding XML intermediate format and write directly in one or
> > several
> > > > JSON file...
> > > > - ...
> > > >
> > > >
> > > > > Is there someone whom find a way to avoid this kind of error
> > (without
> > > > increasing Xms Xmx) ??
> > > >
> > > > Thanks in advance,
> > > >
> > > >
> > > > Brice
> > > >
> > > > [1] http://data-gov.tw.rpi.edu/wiki/Sparqlxml2exhibitjson.xsl
> > > > [2] http://www.simile-widgets.org/exhibit3/
> > > >
> > >
> >
>
>
>
> --
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