[JENA-1521] TDB2 backed Datasets cannot be re-opened.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Jena 3.8.0

Environment

Apache Jena: 3.7.0

Java: 1.8_162

• Assignee: Andy Seaborne
• Reporter: Greg Albiston
• Created: 12/Apr/18 16:38
• Updated: 29/Jun/18 10:13
• Resolved: 13/Apr/18 21:15

Description

If a Dataset connected to with TDB2Factory.connectDataset() is opened, closed and then later re-opened it is reported that the Dataset is closed.

Opening, closing and re-opening a Dataset with TDBFactory.createDataset() causes no issues.

Example code to reproduce:

public void testTDB2OpenClose() {

System.out.println("TDB2 Open Close");
 try {
 Dataset dataset = TDB2Factory.connectDataset("test_tdb2");
 dataset.begin(ReadWrite.WRITE);
 Model defaultModel = dataset.getDefaultModel();
 defaultModel.add(ResourceFactory.createResource("http://example.org/my#SubjA"), ResourceFactory.createProperty("http://example.org/my#PropA"), ResourceFactory.createResource("http://example.org/my#ObjA"));
 dataset.commit();
 dataset.end();
 dataset.close();

Dataset dataset2 = TDB2Factory.connectDataset("test_tdb2");
 dataset2.begin(ReadWrite.READ);
 Model readModel = dataset2.getDefaultModel();
 Iterator<Statement> statements = readModel.listStatements();
 while (statements.hasNext())

{ Statement statement = statements.next(); System.out.println(statement); }
 dataset2.end();
 dataset2.close();
 } catch (Exception ex) \{ System.out.println("Exception: " + ex.getMessage()); }
 }
 

 public void testTDB1OpenClose() {
 
 System.out.println("TDB1 Open Close");
 try {
 Dataset dataset = TDBFactory.createDataset("test_tdb1");
 dataset.begin(ReadWrite.WRITE);
 Model defaultModel = dataset.getDefaultModel();
 defaultModel.add(ResourceFactory.createResource("http://example.org/my#SubjA"), ResourceFactory.createProperty("http://example.org/my#PropA"), ResourceFactory.createResource("http://example.org/my#ObjA"));
 dataset.commit();
 dataset.end();
 dataset.close();
 
 Dataset dataset2 = TDBFactory.createDataset("test_tdb1");
 dataset2.begin(ReadWrite.READ);
 Model readModel = dataset2.getDefaultModel();
 Iterator<Statement> statements = readModel.listStatements();
 while (statements.hasNext()) \{ Statement statement = statements.next(); System.out.println(statement); }

dataset2.end();
 dataset2.close();
 } catch (Exception ex)

{ System.out.println("Exception: " + ex.getMessage()); }

}

 

Issue Links

• links to: GitHub Pull Request #397