HI.
Whatever you are trying to return at this point is not a type that can be
understood (like node or map).
Before returning it, you need to transform or serialize it.
The quickest and dirtiest way to start to see what is going on is to
serialize it.
Assume you have $var
return $var
Change that to
return <res>{$var}</res>
Wrapping it in an XML element causes MarkLogic to serialize complex
objects. Then you can look and see what is being returned.
We usually pack things into map:map and transform this to json for
transport.
Kind Regards,
David
On 12 June 2014 18:45, Marc Limotte <[email protected]> wrote:
> I'm trying this solution out now. It seems to run the query, but then I
> get this exception:
>
> Caused by: java.io.IOException: Nodes of type 'object' are not supported
> in XCC result sequences
>
> at
> com.marklogic.xcc.impl.AbstractResultSequence.nodeFactory(AbstractResultSequence.java:237)
>
> at
> com.marklogic.xcc.impl.AbstractResultSequence.instantiateResultItem(AbstractResultSequence.java:191)
>
> at
> com.marklogic.xcc.impl.CachedResultSequence.<init>(CachedResultSequence.java:56)
>
> at
> com.marklogic.xcc.impl.handlers.GoodQueryResponseHandler.handleResponse(GoodQueryResponseHandler.java:48)
>
> at
> com.marklogic.xcc.impl.handlers.EvalRequestController.serverDialog(EvalRequestController.java:83)
>
> at
> com.marklogic.xcc.impl.handlers.AbstractRequestController.runRequest(AbstractRequestController.java:86)
>
> ...
>
>
> What does this mean and any suggestions on how to fix it?
>
>
> thanks,
>
> marc
>
>
>
>
> On Thu, Jun 5, 2014 at 1:49 PM, Michael Blakeley <[email protected]>
> wrote:
>
>> You could call https://docs.marklogic.com/sem:sparql through an XCC
>> moduleInvoke, something like this:
>>
>> xquery version "1.0-ml";
>> (: sparql.xqy :)
>> import module namespace sem="http://marklogic.com/semantics";
>> at "/MarkLogic/semantics.xqy" ;
>> (: Add more variables to support bindings, etc. as needed :)
>> declare variable $SPARQL as xs:string external ;
>> sem:sparql($SPARQL)
>> (: end :)
>>
>> Then in Java:
>>
>> Session session = contentSource.newSession("mydatabase");
>> Request request = session.newModuleInvoke("sparql.xqy");
>> request.setNewStringVariable('SPARQL', mySparqlQuery);
>> // add more variables to support bindings, etc. as needed.
>> ResultSequence rs = session.submitRequest(request);
>> while (rs.hasNext()) {
>> ResultItem item = rs.next();
>> // handle the item
>> }
>> session.close();
>>
>> Wrap that up in a utility class, parameterize it as needed, and you'll
>> never have to think about it again.
>>
>> -- Mike
>>
>> On 5 Jun 2014, at 09:43 , Marc Limotte <[email protected]> wrote:
>>
>> > Hi.
>> >
>> > I'd like to run a SPARQL query from Java. I've found various bits of
>> documentation (including
>> http://developer.marklogic.com/learn/semantics-exercises/sparql-101).
>> But the docs all seem to cover running SPARQL from the console or maybe
>> REST or Xquery. Can someone point me in the right direction for running a
>> SPARQL query in Java?
>> >
>> > I don't need detailed instructions, just an overview or a pointer to
>> the right documentation.
>> >
>> > thanks for any help,
>> > Marc
>> >
>> > _______________________________________________
>> > General mailing list
>> > [email protected]
>> > http://developer.marklogic.com/mailman/listinfo/general
>>
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>
>
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