{code:java}@Entity
@Table(name = "MY_TABLE")
@DiscriminatorColumn(name = "DISC_COL", discriminatorType = DiscriminatorType.INTEGER)
@DiscriminatorValue("0")
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class ParentEntity {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID")
Integer id;
@JoinColumn(name = "PARENT", foreignKey = @ForeignKey(name = "FK_PARENT_01"))
@ManyToOne
@Fetch(FetchMode.SELECT)
ParentEntity parent;
}{code}
{code:java}@Entity
@DiscriminatorValue("1")
public class ChildEntity extends ParentEntity {}{code}
{code:java}public class ORMUnitTestCase extends BaseCoreFunctionalTestCase {
// Add your entities here.
@Override
protected Class<?>[] getAnnotatedClasses() {
return new Class<?>[] { ParentEntity.class, ChildEntity.class };
}
// Add in any settings that are specific to your test. See
// resources/hibernate.properties for the defaults.
@Override
protected void configure(Configuration configuration) {
super.configure(configuration);
configuration.setProperty(AvailableSettings.SHOW_SQL, Boolean.TRUE.toString());
configuration.setProperty(AvailableSettings.FORMAT_SQL, Boolean.TRUE.toString());
configuration.setProperty(AvailableSettings.DEFAULT_BATCH_FETCH_SIZE, "10");
}
// Add your tests, using standard JUnit.
@Test
public void hhh0000Test() throws Exception {
// BaseCoreFunctionalTestCase automatically creates the SessionFactory and
// provides the Session.
ChildEntity child1 = new ChildEntity();
ChildEntity child2 = new ChildEntity();
try (Session s = openSession()) {
Transaction tx = s.beginTransaction();
child1.parent = child2;
s.persist(child1);
s.persist(child2);
tx.commit();
// To simulate that all data was already persisted before the application starts
s.getSessionFactory().getCache().evictAllRegions();
}
try (Session s = openSession()) {
Transaction tx = s.beginTransaction();
ParentEntity entity = s.byId(ParentEntity.class).load(child1.id);
assertThat(entity.parent).isInstanceOf(ChildEntity.class);
tx.commit();
}
}
}{code}
{noformat}java.lang.AssertionError:
Expecting:
<org.hibernate.bugs.ChildEntity@713afa0e>
to be an instance of:
<org.hibernate.bugs.ChildEntity>
but was instance of:
<org.hibernate.bugs.ParentEntity$HibernateProxy$1AjGQHjF>
at org.hibernate.bugs.ORMUnitTestCase.hhh0000Test(ORMUnitTestCase.java:79)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.hibernate.testing.junit4.ExtendedFrameworkMethod.invokeExplosively(ExtendedFrameworkMethod.java:45)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)
at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.lang.Thread.run(Thread.java:833){noformat}
The exact scenario works fine in 6.1.7.Final and 5.6.15
The issue only happens when all the conditions are met: "batch fetch size", "cache", "fetch mode select"
Reproducible test case to be uploaded attached and also available at [https://github.com/ratoaq2/HHH-16254|https://github.com/ratoaq2/HHH-16254|smart-link] |
|
