jpa-2.0

I have an one-to-one, bidirectional entity relationship with shared keys. When I attempt to save the owner of the association I get a "null id generated" exception against the owned side of the relationship. I am utilizing hibernate-entitymanager and using spring for transaction management. Owning Entity @Entity @Table(name = "lead") public class Lead { private Long leadId; private LeadAffiliate leadAffiliate; @Id @GeneratedValue(strategy = GenerationType.AUTO) public Long getLeadId() { return leadId; } @OneToOne(cascade = CascadeType.ALL) @PrimaryKeyJoinColumn public LeadAffiliate

I need to create a "real" dynamic JPA CriteriaBuilder . I get an Map<String, String> with the statements. It looks like: name : John surname : Smith email : email@email.de ...more pairs possible Here is what i implement: CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<User> query = cb.createQuery(User.class); Root<User> userRoot = query.from(User.class); query.select(userRoot); List<Predicate> predicates = new ArrayList<Predicate>(); Iterator<String> column = statements.keySet().iterator(); while (column.hasNext()) { // get the pairs String colIndex = column.next(); String colValue

If I'm using an ORM like JPA2 - where I have my entities that are mapped to my database, should I still be using a DAO? It seems like a lot more overhead. For example, I would need to maintain three extra packages: One that specifies my domain objects (which pretty much map my Entity objects): public class Employee { private String firstName; private String lastName; ... // Getters and setters } One that contains interfaces that specify my DAO methods public interface EmployeeDAO { public void addEmployee(Employee employee); public Employee getEmployeeById(long id); ... } One that contains