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

[Eugene Tenkaev (JIRA)]

Eugene Tenkaev created JENA-1006:
------------------------------------

             Summary: How read and add triples to `Graph` at the same time?
                 Key: JENA-1006
                 URL: https://issues.apache.org/jira/browse/JENA-1006
             Project: Apache Jena
          Issue Type: Question
          Components: Core, TDB
    Affects Versions: Jena 2.13.0
            Reporter: Eugene Tenkaev


Here is my code:
{code:java}
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")
                )
            );
        }
    }
}
{code}
This code gives me exception:
{noformat}
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)
{noformat}
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|https://github.com/Hronom/test-jena]



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