Hi there, I am trying to runa valid SPARQL ASK query and Fuseki browser query
interface appears to fail when displaying the result. I have reproduced the
issue with both Apache Jena Fuseki 6.1.0 and 6.2.0 on Windows. For example:
ASK {
?s ?p ?o .
}
When the query is executed in the Fuseki browser query interface, the following
JavaScript error is displayed:
Cannot read properties of undefined (reading 'bindings')
No Boolean result is shown.
The query should return a Boolean result:
*
true if the graph contains at least one triple;
*
false if the graph is empty.
Verification
The query itself executes correctly outside the Fuseki browser result renderer.
When the Fuseki query endpoint is accessed directly with:
Accept: application/sparql-results+json
it returns a valid SPARQL Boolean response, for example:
{
"head": {},
"boolean": true
}
The same ASK query also executes correctly using the Jena/ARQ command-line
query tool, where the Boolean result is displayed as yes or no.
I would greatly appreciate any advice on the issue.
Thank you.
Regards, Neli.
Neli P. Zlatareva, Ph.D.
Professor of Computer Science
Central Connecticut State University,
1615 New Britain, CT 06050.
www.cs.ccsu.edu/~neli
