org.apache.jena.fuseki.servlets.ActionErrorException: Cannot read field "succ" because "n" is null #2616
Comments
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Hi @agustaf9, Thanks for the complete report. I've managed to reproduce the problem at my end. |
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Reproduced outside Fuseki and reduced to smaller data. public static void testCaseGH2616() {
JenaSystem.init();
String PREFIXES = """
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
""";
String queryString = PREFIXES + """
SELECT * {
VALUES ?s { rdfs:range rdfs:subPropertyOf }
?s ?p ?o .
}
""";
String updateString = PREFIXES + """
DELETE {?s ?p ?o}
WHERE {
VALUES ?s {
## Only this order, both needed, one single operation.
rdfs:range
rdfs:subPropertyOf
}
?s ?p ?o .
## Exclude this and there is no NPE
##FILTER ( ! ( ?s = rdfs:range && ?p = rdfs:subPropertyOf && ?o = rdfs:range ) )
## No effect - this isn't reached in the gathered triples to delete.
##FILTER ( ! ( ?s = rdfs:subPropertyOf && ?p = rdf:type && ?o = rdf:Property ) )
}
""";
String data = PREFIXES + """
## Triple that triggers the problem.
rdfs:range rdfs:subPropertyOf rdfs:range .
## Must be rdf:type rdf:Property
rdfs:subPropertyOf rdf:type rdf:Property .
""";
Model base = RDFParser.fromString(data, Lang.TTL).toModel();
InfModel inf = ModelFactory.createRDFSModel(base);
// This is the delete order
System.out.println("==== Deletes preview:");
try ( QueryExecution qExec = QueryExecution.model(inf).query(queryString).build()) {
ResultSetFormatter.out(qExec.execSelect(),qExec.getQuery());
}
System.out.println("==== Update");
System.out.flush();
Dataset ds = DatasetFactory.wrap(inf);
UpdateExecution uExec = UpdateExecution
//.model(inf)
.dataset(ds)
.update(updateString)
.build();
uExec.execute();
System.out.println("DONE");
} |
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Version
5.0.0
What happened?
Steps to Reproduce
curl -X POST 'http://localhost:3030/$/datasets' --upload-file ./dsConfigTemplate.ttl --header "Content-Type: text/turtle"wheredsConfigTemplate.ttlis:queryendpoint toupdateand run this query:Cannot read field "succ" because "n" is nullRelevant output and stacktrace
Are you interested in making a pull request?
No
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