Hi Nico,
You should pose this question on the Virtuoso Users mailing list rather than
the DBpedia mailing, thus please subscribe the the Virtuoso mailing lists as
detailed at:
http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VOSMailingLists
What Virtuoso release are you running when encountering this issue ?
We also have a Jena Provider which is Java based, but would like to determine
if their is an issue with the Sesame provider and resolve it, so if you can
provide steps to reproduce that would be useful ...
Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support
Twitter: http://twitter.com/OpenLink
On 20 Apr 2010, at 15:27, N.Stieler wrote:
> Hello everybody,
>
> We have a problem with Virtuoso Sesame Provider.
>
> We get a NullPointerException, when we try to read the result
> (result.hasnext()), but only if we have a OPTIONAL in the query:
> SELECT distinct ?c ?l WHERE {{?c rdf:type owl:Class}. OPTIONAL {?c rdfs:label
> ?l}. FILTER (isURI(?c)) } à Nullpointerexception
>
> SELECT distinct ?c ?l WHERE {{?c rdf:type owl:Class. FILTER (isURI(?c)) } à
> exact result and no exceptions
>
> But if I run this query with using the Virtuoso JDBC Driver or web interface
> it works in all cases.
>
> - Do you have a solution to this problem?
> - Is it dependent to the OPTIONAL?
> - Do you know any other Interfaces for Java?
>
> Thank you for your help.
>
> Regards,
> Nico
>
>
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