New Features of JSR 317 (JPA 2.0)

Feb 5, 20108 likes1,787 views

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.

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

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

@OneToMany / @ManyToOne
@OneToMany
@JoinColumn(name = "ID")
private List<Editor> editors;

markus@eisele.net 3

@ElementCollection

@ElementCollection
private Set<String> websites = new HashSet();

markus@eisele.net 4

@OrderColumn

@OrderColumn(name="ED_ORDER")
private List<Editor> editors;

markus@eisele.net 5

@MapKeyJoinColumn
@JoinTable(name="ADRESSESS",
joinColumns=
@JoinColumn(name="AUTORID"),
inverseJoinColumns=@JoinColumn(name="CONTACTID"))
@MapKeyJoinColumn(name="ADRESSID")
Map<Adress, Contactdetails> allAdressess;

markus@eisele.net 6

@Embeddable
@Embedded
PhoneNumber number;

@ManyToOne
PhoneServiceProvider provider;

markus@eisele.net 7

@Access
@Entity @Access(FIELD)
public class PhoneNumber {
...
@Transient String localnumber;

@Access(PROPERTY)
protected double getInternationalNumber(Locale locale) {
return convertToIntNumber(localnumber);
}
...
}

8

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

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

Criteria API II
Root autor = cq.from(Author.class);
cq.where(qb.equal(author.get("name"), name));
cq.select(autor);

markus@eisele.net 11

$Metamodel API @Entity public class Customer { @Id int custId; String name; ... @OneToMany(mappedBy="customer") Set<Order> orders; ... } import javax.persistence.metamodel.*; @TypesafeMetamodel public class Customer_ { public static volatile Attribute<Customer, Integer> custId; public static volatile Attribute<Customer, String> name; public static volatile Set<Customer, Order> orders; ... } 12$

Metamodel API + Criteria API

cq.where(qb.equal(autor.get(Autor_.name), "name"));

markus@eisele.net 13

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

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

JPQL Enhancements
• Timestamp
• Non-polymorphic Queries
• Collection Paramters in IN Expression
• Ordered List Index
• CASE Statement

16

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

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

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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; [email protected] 3

5. @ElementCollection @ElementCollection private Set<String> websites = new HashSet(); [email protected] 4

6. @OrderColumn @OrderColumn(name="ED_ORDER") private List<Editor> editors; [email protected] 5

7. @MapKeyJoinColumn @JoinTable(name="ADRESSESS", joinColumns= @JoinColumn(name="AUTORID"), inverseJoinColumns=@JoinColumn(name="CONTACTID")) @MapKeyJoinColumn(name="ADRESSID") Map<Adress, Contactdetails> allAdressess; [email protected] 6

8. @Embeddable @Embedded PhoneNumber number; @ManyToOne PhoneServiceProvider provider; [email protected] 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; } [email protected] 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(); [email protected] 10

12. Criteria API II Root autor = cq.from(Author.class); cq.where(qb.equal(author.get("name"), name)); cq.select(autor); [email protected] 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")); [email protected] 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 [email protected] 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 [email protected] 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(); } [email protected] 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 [email protected] 18

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