IllegalStateException: Operation cannot be executed because the enclosing transaction is closed

[fanc...@gmail.com]

I am using titan-0.5.3 with hbase 0.98-hadoop2

my codes:

    for (Object o : graph.getVertices()) {

      TitanVertex tv = (TitanVertex) o;

      TitanTools.getAllStringValue(tv);

   }

Exception in thread "main" java.lang.IllegalStateException: Operation cannot be executed because the enclosing transaction is closed

        at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.verifyOpen(StandardTitanTx.java:282)

        at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.getVertex(StandardTitanTx.java:367)

        at com.thinkaurelius.titan.graphdb.vertices.AbstractVertex.it(AbstractVertex.java:40)

        at com.thinkaurelius.titan.graphdb.relations.CacheProperty.<init>(CacheProperty.java:26)

        at com.thinkaurelius.titan.graphdb.transaction.RelationConstructor.readRelation(RelationConstructor.java:79)

        at com.thinkaurelius.titan.graphdb.transaction.RelationConstructor.readRelation(RelationConstructor.java:62)

        at com.thinkaurelius.titan.graphdb.transaction.RelationConstructor$1$1.next(RelationConstructor.java:46)

        at com.thinkaurelius.titan.graphdb.transaction.RelationConstructor$1$1.next(RelationConstructor.java:34)

[fanc...@gmail.com]

  public static Set<String> getAllStringValue(TitanVertex tv){

    Set<String> set=new HashSet<>(3);

    for(TitanProperty tp:tv.getProperties("key")){

      set.add((String)tp.getValue());

    }

    return set;

[Matthias Broecheler]

It looks like the enclosing transaction was closed somewhere.

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Matthias Broecheler
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[Li Li]

it throws exception when cal getAllStringValue method. But I do not
close transaction in the for loop. And when I run it again, it's ok.

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