HHH-11740 - Default MultiTableBulkIdStrategy for DB2 does not work with connection pools

- Fix tests on PostgreSQL

hibernate-core/src/test/java/org/hibernate/test/unionsubclass/UnionSubclassTest.java

@@ -22,6 +22,7 @@ import org.hibernate.testing.SkipForDialect;
 import org.hibernate.testing.TestForIssue;
 import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
 
+import static org.hibernate.testing.transaction.TransactionUtil.doInHibernate;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
@@ -414,9 +415,7 @@ public class UnionSubclassTest extends BaseCoreFunctionalTestCase {
 			comment = "skip dialects that throw PessimisticLockException"
 	)
 	public void testBulkOperationsInTwoConcurrentSessions() throws Exception {
-		Session s = openSession();
-		s.getTransaction().begin();
-
+		doInHibernate( this::sessionFactory, s -> {
 			Location mars = new Location( "Mars" );
 			s.persist( mars );
 
@@ -438,40 +437,31 @@ public class UnionSubclassTest extends BaseCoreFunctionalTestCase {
 
 			Human human = new Human();
 			human.setIdentity( "Jane Doe" );
+			human.setSex( 'M' );
 			earth.addBeing( human );
 
 			s.persist( human );
+		} );
 
-		s.getTransaction().commit();
-		s.close();
-
-		Session s1 = openSession();
-		s1.beginTransaction();
+		doInHibernate( this::sessionFactory, s1 -> {
 			assertEquals(
 					1,
 					s1.createQuery( "update Being set identity = 'John Doe' where identity = 'Jane Doe'" )
 							.executeUpdate()
 			);
 
-		Session s2 = openSession();
-		s2.beginTransaction();
+			doInHibernate( this::sessionFactory, s2 -> {
 				assertEquals( 1, s2.createQuery( "delete from Being where species = 'Martian'" ).executeUpdate() );
+			} );
+		} );
 
-		s2.getTransaction().commit();
-		s1.getTransaction().commit();
-
-		s1.close();
-		s2.close();
-
-		s = openSession();
-		s.getTransaction().begin();
-		human = (Human) s.createQuery( "from Being" ).uniqueResult();
+		doInHibernate( this::sessionFactory, s -> {
+			Human human = (Human) s.createQuery( "from Being" ).uniqueResult();
 			assertEquals( "John Doe", human.getIdentity() );
 			s.createQuery( "delete from Being" ).executeUpdate();
 			s.createQuery( "delete from Hive" ).executeUpdate();
 			s.createQuery( "delete from Location" ).executeUpdate();
-		s.getTransaction().commit();
-		s.close();
+		} );
 	}
 }