@Target(value={METHOD,FIELD}) @Retention(value=RUNTIME) public @interface GeneratedValue
 The GeneratedValue annotation
 may be applied to a primary key property or field of an entity or
 mapped superclass in conjunction with the Id annotation.
 The use of the GeneratedValue annotation is only
 required to be supported for simple primary keys.  Use of the
 GeneratedValue annotation is not supported for derived
 primary keys.
 
     Example 1:
     @Id
     @GeneratedValue(strategy=SEQUENCE, generator="CUST_SEQ")
     @Column(name="CUST_ID")
     public Long getId() { return id; }
     Example 2:
     @Id
     @GeneratedValue(strategy=TABLE, generator="CUST_GEN")
     @Column(name="CUST_ID")
     Long id;
 Id, 
TableGenerator, 
SequenceGenerator| Modifier and Type | Optional Element and Description | 
|---|---|
| String | generator(Optional) The name of the primary key generator
 to use as specified in the  SequenceGeneratororTableGeneratorannotation. | 
| GenerationType | strategy(Optional) The primary key generation strategy
 that the persistence provider must use to
 generate the annotated entity primary key. | 
public abstract GenerationType strategy
public abstract String generator
SequenceGenerator 
 or TableGenerator annotation.
 Defaults to the id generator supplied by persistence provider.
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