Damien Obrist created JENA-2360:
-----------------------------------
Summary: No result when listing specific statement using TDB
Key: JENA-2360
URL: https://issues.apache.org/jira/browse/JENA-2360
Project: Apache Jena
Issue Type: Bug
Components: TDB2
Affects Versions: Jena 5.1.0
Reporter: Damien Obrist
The following sample code reproduces the issue:
{code:java}
public static void main(String[] arguments) {
try {
FileUtils.deleteDirectory(new File("sample-data"));
} catch (IOException e) {
throw new RuntimeException(e);
}
Dataset dataset = TDB2Factory.connectDataset("sample-data");
Txn.executeWrite(dataset, () -> {
// TDB: 'listStatement' returns no result
Model model = dataset.getDefaultModel();
// in-memory: 'listStatement' returns statement
//Model model = ModelFactory.createDefaultModel();
model.add(
ResourceFactory.createResource("http://www.test.com/my-graph";),
RDF.type,
ResourceFactory.createTypedLiteral("2", XSDDatatype.XSDdecimal)
);
Statement stmt1 = model.listStatements().next();
StmtIterator stmts = model.listStatements(stmt1.getSubject(),
stmt1.getPredicate(), stmt1.getObject());
while (stmts.hasNext())
System.out.println(stmts.next());
});
} {code}
The behaviour is as follows:
* When running the code with Jena 5.1.0, the second {{listStatements}} call
returns no result and nothing is printed
* When running the code with Jena 5.0.0, the second {{listStatements}} call
returns the expected statement and the following is printed
{code:java}
[http://www.test.com/my-graph, http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
"2"^^xsd:decimal] {code}
Note that when using the in-memory model instead of the TDB one, then with both
Jena 5.0.0 and 5.1.0 the second {{listStatements}} call returns the expected
statement and prints the above message.
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