tkaryadis opened a new issue, #1874:
URL: https://github.com/apache/jena/issues/1874
### Version
4.8.0
### What happened?
I wanted to write this simple RDF-star query using the Jena query builder :
```sparql
SELECT ?city
WHERE
{ << <https://squery.org/joy/athens> <https://squery.org/joy/connected>
?city >>
<https://squery.org/joy/distance>
"500"^^<http://www.w3.org/2001/XMLSchema#int>}
```
My code :
```java
var athens = ResourceFactory.createResource(
"https://squery.org/joy/athens";).asNode();
var connected =ResourceFactory.createProperty(
"https://squery.org/joy/connected";).asNode();
var city_var = Var.alloc("city").asNode();
Node_Triple node_triple = new Node_Triple(athens,connected,city_var);
var distance = ResourceFactory.createResource(
"https://squery.org/joy/distance";).asNode();
var l500 = ResourceFactory.createTypedLiteral( 500).asNode();
Triple triple = Triple.create(node_triple,distance,l500);
SelectBuilder s = new SelectBuilder();
var q=
s.addVar("?city")
.addWhere(triple)
.build()
.toString();
System.out.println(q);
```
Exception :
```java
Exception in thread "main" java.lang.IllegalArgumentException: Subject (<<
https://squery.org/joy/athens @https://squery.org/joy/connected ?city >>) must
be a URI, blank, variable, or a wildcard.
Is a prefix missing? Prefix must be defined before use.
at
org.apache.jena.arq.querybuilder.handlers.WhereHandler.testTriple(WhereHandler.java:200)
at
org.apache.jena.arq.querybuilder.handlers.WhereHandler.addWhere(WhereHandler.java:212)
at
org.apache.jena.arq.querybuilder.SelectBuilder.addWhere(SelectBuilder.java:307)
at org.apache.jena.arq.querybuilder.MyMain.main(MyMain.java:44)
```
I used the source code and i comment the error checking on
querybuilder/handlers/wherehandler,
private static void testTriple(TriplePath t) function and it worked,
maybe the wherehanlder is not updated for RDF-star,
and throws exception. After making comment the //throw new
IllegalArgumentException(sb.toString());
I got the expected output :
```sparql
SELECT ?city
WHERE
{ << <https://squery.org/joy/athens> <https://squery.org/joy/connected>
?city >>
<https://squery.org/joy/distance>
"500"^^<http://www.w3.org/2001/XMLSchema#int>}
```
### Relevant output and stacktrace
_No response_
### Are you interested in making a pull request?
None
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