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)) } --> Nullpointerexception
SELECT distinct ?c ?l WHERE {{?c rdf:type owl:Class. FILTER (isURI(?c)) } -->
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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