[appengine-java] Simple Put, get operations in transaction

[Trung]

I have a simple test as below

public class TestDS extends TestCase{
    private final LocalServiceTestHelper helper =
      new LocalServiceTestHelper(new
LocalDatastoreServiceTestConfig());

  @Before
  public void setUp() {
    helper.setUp();
  }

  @After
  public void tearDown() throws Exception{
    Thread.sleep(100);

    helper.tearDown();
  }

  public void testWithoutTransaction() throws Exception{
    DatastoreService ds =
DatastoreServiceFactory.getDatastoreService();
    doTest(ds, null);
  }

  public void testWithTransaction() throws Exception{
    DatastoreService ds =
DatastoreServiceFactory.getDatastoreService();
    Transaction txn = ds.beginTransaction();
    doTest(ds, txn);
    txn.commit();
  }

  public void doTest(DatastoreService ds, Transaction txn) throws
Exception{
    Key parentKey = KeyFactory.createKey("parent", "default");

    Entity entity = new Entity("Entity01", parentKey);
    entity.setProperty("prop01", "Property 01");
    Key key = ds.put(txn, entity);

    Entity entity2 = ds.get(txn, key);
    System.out.println(entity2.getProperty("prop01"));
  }
}

For the test testWithoutTransaction, it run successful.

However, the test testWithTransaction, exception
EntityNotFoundException is raised at line
Entity entity2 = ds.get(txn, key);

Why we can not get the entity we just put into datastore within a
transaction?
Please help.

Thanks in advance.

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