New Features of JSR 317 (JPA 2.0)
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This document summarizes the new features of JPA 2.0 as defined in JSR 317. Key additions include expanded object-relational mappings, improved domain modeling capabilities, enhancements to the Java Persistence query language including a Criteria API, standardization of configuration hints, support for validation via JSR 303, and second level caching.
![Bean Validation (JSR-303)
@Entity
public class Autor implements Serializable {
[…]
@NotNull
@Size(max=30)
private String name;
[…]
}
•@NotNull
•@Size.max
•@Digits
•@Min / @Max
•@Future / @Past
•@Size
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New Features of JSR 317 (JPA 2.0)
- 1. „JPA 2.0“ New Features of JSR 317
- 2. JSR 317: Java Persistence API • Specification Lead: Linda DeMichiel, Sun Microsystems, Inc. • Expert Group: Adobe Systems Inc., akquinet tech@spree, BEA Systems, Adam Bien, DataDirect Technologies, Ericsson AB, Antonio Goncalves, IBM, Chris Maki, Oracle, OW2, Pramati Technologies, RedHat, SAP AG Sun Microsystems Inc., Sybase, TmaxSoft Inc., VMWare • Referenzimplemention: EclipseLink 2.x, www.eclipse.org/eclipselink 1
- 3. Goals • Expanded O/R mappings • Improved domain modeling capabilities • Additions to the Java Persistence query language • An API for criteria queries • Standardization of configuration hints • Additional contracts for detached entities and extended persistence contexts • Support for validation via integration with the work of JSR 303 2
- 4. @OneToMany / @ManyToOne @OneToMany @JoinColumn(name = "ID") private List<Editor> editors; markus@eisele.net 3
- 5. @ElementCollection @ElementCollection private Set<String> websites = new HashSet(); markus@eisele.net 4
- 6. @OrderColumn @OrderColumn(name="ED_ORDER") private List<Editor> editors; markus@eisele.net 5
- 7. @MapKeyJoinColumn @JoinTable(name="ADRESSESS", joinColumns= @JoinColumn(name="AUTORID"), inverseJoinColumns=@JoinColumn(name="CONTACTID")) @MapKeyJoinColumn(name="ADRESSID") Map<Adress, Contactdetails> allAdressess; markus@eisele.net 6
- 8. @Embeddable @Embedded PhoneNumber number; @ManyToOne PhoneServiceProvider provider; markus@eisele.net 7
- 9. @Access @Entity @Access(FIELD) public class PhoneNumber { ... @Transient String localnumber; @Access(PROPERTY) protected double getInternationalNumber(Locale locale) { return convertToIntNumber(localnumber); } ... } 8
- 10. Combined Primary Keys @Entity @IdClass(ArticlePK.class) public class Article { @Id Long id; @Id @ManyToOne Magazine magazine; @Id @ManyToOne Author author; } public class ArticlePK { Long id; Long magazine; Long author; } markus@eisele.net 9
- 11. Criteria API I // create / inject EntityManager EntityManager em = ...; // build Criteria Query CriteriaBuilder qb = em.getCriteriaBuilder(); CriteriaQuery cq = qb.createQuery(); Root<Author> autor = cq.from(Author.class); cq.select(author); // execute Criteria Query Query query = em.createQuery(cq); List result = query.getResultList(); markus@eisele.net 10
- 12. Criteria API II Root autor = cq.from(Author.class); cq.where(qb.equal(author.get("name"), name)); cq.select(autor); markus@eisele.net 11
- 13. Metamodel API @Entity public class Customer { @Id int custId; String name; ... @OneToMany(mappedBy="customer") Set<Order> orders; ... } import javax.persistence.metamodel.*; @TypesafeMetamodel public class Customer_ { public static volatile Attribute<Customer, Integer> custId; public static volatile Attribute<Customer, String> name; public static volatile Set<Customer, Order> orders; ... } 12
- 14. Metamodel API + Criteria API cq.where(qb.equal(autor.get(Autor_.name), "name")); markus@eisele.net 13
- 15. Bean Validation (JSR-303) @Entity public class Autor implements Serializable { […] @NotNull @Size(max=30) private String name; […] } •@NotNull •@Size.max •@Digits •@Min / @Max •@Future / @Past •@Size markus@eisele.net 14
- 16. LockModeTypes .READ => LockModeType.OPTIMISTIC .WRITE => LockModeType.OPTIMISTIC_FORCE_INCREMENT NEW!: LockModeType.PESSIMISTIC_READ (Repeatable Read) LockModeType.PESSIMISTIC_WRITE (Serialized) LockModeType.PESSIMISTIC_FORCE_INCREMENT markus@eisele.net 15
- 17. JPQL Enhancements • Timestamp • Non-polymorphic Queries • Collection Paramters in IN Expression • Ordered List Index • CASE Statement 16
- 18. Second Level Cache public interface Cache { boolean contains(Class clz, Object primaryKey); void evict(Class clz, Object primaryKey); void evict(Class clz); void evictAll(); } markus@eisele.net 17
- 19. Links und Informationen • http://blog.eisele.net/ • http://blogs.sun.com/ldemichiel/ • http://www.jcp.org/en/jsr/detail?id=317 • http://www.eclipse.org/eclipselink markus@eisele.net 18