[Neo4j] batch within batch throws NotInTransactionException in 2.2.x

[Frandro]

I used to code in neo4j 2.1.x for batch within batch as following.
However, the code throws a NotInTransactionException exception in neo4j 
2.2.x.

Is this code wrong from 2.2.x?

Transaction tx = mGraphDb.beginTx();

try
{
while(itor.hasNext())
{
// DO SOMETHING
 if (count % BATCH_SIZE_GDB == 0)
{
tx.success();
tx.close();
tx = mGraphDb.beginTx();
}
 count++;
}
 tx.success();
} catch (Exception e) {
e.printStackTrace();
} finally {
tx.close();
}


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