I'm writing a simple JUnit test class which uses the utilities mentioned
here: http://code.google.com/appengine/docs/java/tools/localunittesting.html
I'm stuck trying to persist more than one instance of simple entity in a
single transaction. Every time I run the test shown below, it fails with:
Caused by: java.lang.IllegalArgumentException: can't operate on multiple
entity groups in a single transaction. found both Element {
type: "Company"
id: 1
}
and Element {
type: "Company"
id: 2
}
I have one entity class "Company" which looks something like this:
@Entity
public class Company {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key id;
@Basic
private String name;
public Company(String name) {
setName(name);
}
public Key getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
My test class (mostly taken from the examples in the google
documentation) does the following within my Eclipse environment:
public class LocalDatastoreTest {
private final LocalServiceTestHelper helper = new LocalServiceTestHelper(
new LocalDatastoreServiceTestConfig());
EntityManager em = EMF.get().createEntityManager();
@Before
public void setUp() {
helper.setUp();
}
@After
public void tearDown() {
helper.tearDown();
}
@Test
public void testPersist() {
em.getTransaction().begin();
em.persist(new Company("Best Buy"));
em.persist(new Company("Trader Joe's"));
em.persist(new Company("Jack In The Box"));
em.getTransaction().commit();
}
}
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