[JENA-1006] How read and add triples to `Graph` at the same time?

• Type: Question
• Status: Closed
• Priority: Minor
• Resolution: Done
• Affects Version/s: Jena 2.13.0
• Fix Version/s: Jena 3.0.1
• Component/s: Core, TDB
• Assignee: Unassigned
• Reporter: Yevhen Tienkaiev
• Created: 05/Aug/15 19:42
• Updated: 06/Aug/15 07:16
• Resolved: 06/Aug/15 07:16

Description

Here is my code:

public class App {
    public static void main(String[] args) {
        DatasetGraph datasetGraph = TDBFactory.createDatasetGraph();
        Graph graph = datasetGraph.getDefaultGraph();

        // Fill graph.
        graph.add(
            new Triple(
                NodeFactory.createURI("www.test.org/unit13"),
                NodeFactory.createURI("name"),
                NodeFactory.createLiteral("Unit 13", "en")
            )
        );

        graph.add(
            new Triple(
                NodeFactory.createURI("www.test.org/unit13"),
                NodeFactory.createURI("type"),
                NodeFactory.createURI("robot")
            )
        );

        graph.add(
            new Triple(
                NodeFactory.createURI("www.test.org/unit13"),
                NodeFactory.createURI("creationYear"),
                NodeFactory.createURI("2015")
            )
        );

        // Test
        ExtendedIterator<Triple> iter = graph.find(
            Node.ANY,
            NodeFactory.createURI("creationYear"),
            NodeFactory.createURI("2015")
        );

        while (iter.hasNext()) {
            Triple triple = iter.next();
            Node subject = triple.getSubject();

            // Exception here.
            graph.add(
                new Triple(
                    subject, NodeFactory.createURI("status"), NodeFactory.createURI("available")
                )
            );
        }
    }
}

This code gives me exception:

Exception in thread "main" java.util.ConcurrentModificationException: Iterator: started at 8, now 9
    at com.hp.hpl.jena.tdb.sys.DatasetControlMRSW.policyError(DatasetControlMRSW.java:157)
    at com.hp.hpl.jena.tdb.sys.DatasetControlMRSW.access$000(DatasetControlMRSW.java:32)
    at com.hp.hpl.jena.tdb.sys.DatasetControlMRSW$IteratorCheckNotConcurrent.checkCourrentModification(DatasetControlMRSW.java:110)
    at com.hp.hpl.jena.tdb.sys.DatasetControlMRSW$IteratorCheckNotConcurrent.hasNext(DatasetControlMRSW.java:118)
    at org.apache.jena.atlas.iterator.Iter$4.hasNext(Iter.java:318)
    at org.apache.jena.atlas.iterator.Iter$4.hasNext(Iter.java:318)
    at org.apache.jena.atlas.iterator.Iter$4.hasNext(Iter.java:318)
    at org.apache.jena.atlas.iterator.Iter.hasNext(Iter.java:942)
    at com.hp.hpl.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:90)
    at com.github.hronom.test.jena.App.main(App.java:48)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)

I accept this.
But how I must change code, to add meta info <status> <available> to every <www.test.org/unit13> that has <creationYear> <2015>?

Test project on GitHub

Please help me