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I have a simple OneToMany association between 2 object Parent & Child as shown below. Parent Entity @Entity public class Parent { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; private String name; @Version private Long version; @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER) List<Child> children = new ArrayList<Child>(); .... } Child entity @Entity public class Child { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; private String name; @Version private Long version; ... } Following is my test which loads an existing parent adds a child and calls EntityManager.merge() on the parent. @Test public void testParent(){ Parent parent = (Parent) dao.loadParent(Parent.class, parentId); Child c = new Child(); c.setName("c"); parent.getChildren().add(c); dao.mergeEntity(parent); Assert.assertNotNull(c.getId()); } The assertion where primary key of the id is tested fails. I see the record being inserted correctly in the database along with the primary key auto assigned. All my DAO calls are wrapped around transaction with propagation as Required.

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