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JPA Annotation GeneratedValue Target: METHOD, FIELD Implemented Interfaces: Annotation Provides for the specification of generation strategies for the values of primary keys. The GeneratedValue ... conjunction with the Id annotation. The use of the GeneratedValue annotation is only required

Marking a field with the @ GeneratedValue annotation specifies that a value will be automatically ... @ GeneratedValue with the AUTO strategy: @Entity public class EntityWithAutoId1 { @Id @ GeneratedValue ... definition is equivalent: @Entity public class EntityWithAutoId2 { @Id @ GeneratedValue long id

JPA Annotation Attribute in javax.persistence. GeneratedValue String generator default "" (Optional) The name of the primary key generator to use as specified in the SequenceGenerator or TableGenerator annotation. Defaults to the id generator supplied by persistence provider. Since: JPA 1.0

JPA Annotation Attribute in javax.persistence. GeneratedValue GenerationType strategy default AUTO (Optional) The primary key generation strategy that the persistence provider must use to generate the annotated entity primary key. Since: JPA 1.0

a primary key field: @Entity public class Project { @Id @ GeneratedValue long id; // still set ... ; @ GeneratedValue annotation specifies that the primary key is automatically allocated by ObjectDB. Automatic value ... If an entity has a primary key field that is not marked with @ GeneratedValue , automatic primary key

Automatically generated values are mainly useful for primary key fields, but are supported by ObjectDB also for regular (non primary key) persistent fields. At the field level, the @ GeneratedValue with an optional GenerationType strategy is specified: The @ GeneratedValue annotation

too). @Entity public class Product implements Serializable { @Id @ GeneratedValue private long id ... implements Serializable { @Id //@ GeneratedValue private long id; @ManyToMany(cascade=CascadeType.PERSIST ... .persistence. GeneratedValue ; import javax.persistence.Id; import javax.persistence.ManyToMany; import javax

. GeneratedValue ; import javax.persistence.Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @ GeneratedValue Long id; private

.Serializable; import java.sql.Date; import javax.persistence.Entity; import javax.persistence. GeneratedValue ... final long serialVersionUID = 1L; // Persistent Fields: @Id @ GeneratedValue Long id; private String

. GeneratedValue ; import javax.persistence.Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @ GeneratedValue Long id

. GeneratedValue ; import javax.persistence.Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @ GeneratedValue Long id; private String

. GeneratedValue ; import javax.persistence.Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @ GeneratedValue Long id; private

; import javax.persistence. GeneratedValue ; import javax.persistence.Id; @Entity public class Guest ... @ GeneratedValue Long id; private String name; private Date signingDate; // Constructors: public

.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence. GeneratedValue ; import ... ;          @Id @ GeneratedValue private long id;   ... Serializable {             @Id @ GeneratedValue

I've got two objects: @Entity public class EEvent { @Id @ GeneratedValue (strategy = GenerationType ... implements Serializable { private static final long serialVersionUID = 1L; @Id @ GeneratedValue private Long ... @ GeneratedValue private Long id; @Temporal(TemporalType.TIMESTAMP) private Date sendDate = new Date

.persistence.FetchType; import javax.persistence. GeneratedValue ; import javax.persistence.GenerationType ... Serializable { private static final long serialVersionUID = 1L; // @ GeneratedValue @Id @Column(name = "id") @ GeneratedValue (strategy = GenerationType.IDENTITY) private int id; @Column(name = "username") private

for the GeneratedValue annotation. A table generator may be specified on the entity class or ... ", allocationSize=1) @Id @ GeneratedValue (strategy=TABLE, generator="empGen") int id; ... } Example 2 ... _KEY", valueColumnName="GEN_VALUE", pkColumnValue="ADDR_ID") @Id @ GeneratedValue (strategy=TABLE

.persistence. GeneratedValue ; import javax.persistence.GenerationType; import javax.persistence.Id ... public class Client implements Serializable , Identifiable { // @Id @ GeneratedValue (strategy ... ; import javax.persistence. GeneratedValue ; import javax.persistence.GenerationType; import javax

annotation @ GeneratedValue like the following: Solution 1) class A { @Id @ GeneratedValue private long uid; ... } Solution 2) class CompositePK { @ GeneratedValue private long uid; ... } Actually I ... ) @Entity public static class A {     @Id @ GeneratedValue public long id;   

with no  @ GeneratedValue  and you do not initialize it manually. support Support Yes, at first, there is no @ GeneratedValue , but it do not work after I add this command: @ GeneratedValue ... ; @ GeneratedValue should solve the problem, unless you already have entity objects with IDs 0

= "b", allocationSize = 1) public class Parent { @Id @ GeneratedValue (strategy = GenerationType.SEQUENCE ... @ GeneratedValue (strategy = GenerationType.SEQUENCE, generator = "b") private int id; @ManyToOne ... ;EntityManagerFactory), it fails. Entities: @Entity public class Parent { @Id @ GeneratedValue (strategy

Serializable { private static final long serialVersionUID = 1L; @Id @ GeneratedValue private long id

static final long serialVersionUID = 1L; @Id @ GeneratedValue private long id; private int x; private

; import javax.persistence. GeneratedValue ; import javax.persistence.Id; import org.eummcr.datastore ... implements Serializable { private static final long  serialVersionUID = 1L; @Id @ GeneratedValue ... ;      @Id @ GeneratedValue Long id;       

.FetchType; import javax.persistence.FlushModeType; import javax.persistence. GeneratedValue ; import javax ... { @Entity public static class ParentEntity {   @Id   @ GeneratedValue   private long id ... ; @Id   @ GeneratedValue   private long id;   @ManyToOne(fetch = FetchType.LAZY

. GeneratedValue ; import javax.persistence.Id; import javax.persistence.ManyToOne; import javax ... {   @Id   @ GeneratedValue   private long id;   @OneToMany(fetch = FetchType.LAZY ... ;   } } @Entity public static class ChildEntity {   @Id   @ GeneratedValue   private

javax.persistence. GeneratedValue ; import javax.persistence.Id; import javax.persistence ... class Person {   @Id @ GeneratedValue private long id;   private String name;   ... ;   } } @Entity public static class Address {   @Id @ GeneratedValue private long id;  

: private @Id @ GeneratedValue long id; // JPA code and then the ID will be injected automatically ... @Id @ GeneratedValue long id; but i think it only works in case of JPA not with JDO. Do you the any ... anyway:     @Id @ GeneratedValue     private long id; This should work

.IObjectValue {   @javax.persistence.Id   @javax.persistence. GeneratedValue (strategy ... ; @javax.persistence. GeneratedValue (strategy=javax.persistence.GenerationType.TABLE, generator ... ; @javax.persistence. GeneratedValue (strategy = javax.persistence.GenerationType.TABLE, generator

long serialVersionUID = -7979088681300801112L; /** * Primary key for entity */ @Id // @ GeneratedValue ... ", initialValue = 1, allocationSize = 50) // @ GeneratedValue (strategy = GenerationType.SEQUENCE) @ GeneratedValue private Long id; /** * Version of object, supporting optimistic lock */ @Column (name = "opt

;   @Id @ GeneratedValue long id;         int value ... .EntityManagerFactory; import javax.persistence. GeneratedValue ; import javax.persistence.Id; import javax.persistence ... ;     @ GeneratedValue         long id;  

{     @Id @ GeneratedValue     private long characterId;   ... characterLocation; and: @Entity public class Cell {     @Id @ GeneratedValue    ... {     @Id @ GeneratedValue     private long cellID;  

.persistence. GeneratedValue ; import javax.persistence.GenerationType; import javax.persistence.Id ... class Node { @Id     @ GeneratedValue (strategy=GenerationType.IDENTITY) int id

follows: @Id @ GeneratedValue (strategy = GenerationType.AUTO) private Long id; private String ... fields are as follows: @Id @ GeneratedValue (strategy = GenerationType.AUTO) private Long id; private

@ GeneratedValue     private long id;     @ManyToMany(fetch = FetchType. EAGER , cascade ... {     @Id @ GeneratedValue     private long id;     @ManyToMany(fetch

.persistence.Entity; import javax.persistence. GeneratedValue ; import javax.persistence.Id; @Entity public class SimpleEntity {     @Id @ GeneratedValue private Long primaryKey;    

BaseEntity implements Serializable, Convertable {     @ GeneratedValue (strategy ... , Convertable {     @ GeneratedValue (strategy = GenerationType.AUTO)     

A { @Id @ GeneratedValue Long id; @OneToMany(fetch=FetchType.LAZY, cascade=CascadeType.ALL) List list; } @Entity static class B { @Id @ GeneratedValue public Long id; int value; B(int value

. GeneratedValue ; import javax.persistence.Id; /** * MyEntity */ @Entity public class MyEntity implements Serializable { private static final long serialVersionUID = 1L; @Id @ GeneratedValue private long

. GeneratedValue ; import javax.persistence.Id; @Entity public class RequirementDBEntity implements Serializable { /** * */ private static final long serialVersionUID = 5019171545896480392L; @Id @ GeneratedValue

") @ GeneratedValue (strategy = GenerationType.AUTO) private Long id; @OneToMany (fetch=FetchType.LAZY,cascade ... ; @Id @Column(name = "ID") @ GeneratedValue (strategy = GenerationType.AUTO) private Long id

.persistence.EntityManagerFactory; import javax.persistence. GeneratedValue ; import javax.persistence ... ;     @ GeneratedValue (strategy=GenerationType.SEQUENCE, generator="DateTime_sequence

: @Entity public class Request { public Request() { } @Id @ GeneratedValue (strategy=GenerationType ... @ GeneratedValue (strategy=GenerationType.IDENTITY)         private

; @ GeneratedValue (strategy = GenerationType.SEQUENCE , generator = "gen") @Id private int principalId; public ... ") }) public class UserInfo implements Serializable { @ GeneratedValue (strategy = GenerationType.AUTO

JPA Annotation SequenceGenerator Target: TYPE, METHOD, FIELD Implemented Interfaces: Annotation Defines a primary key generator that may be referenced by name when a generator element is specified for the GeneratedValue annotation. A sequence generator may be specified on the entity class or

JPA Enum GenerationType java.lang.Object ∟  java.lang.Enum ∟  javax.persistence.GenerationType Defines the types of primary key generation strategies. See Also: GeneratedValue Since: JPA 1.0 The Auto Generated Values article explains how to use GenerationType . Enum Constants AUTO

: @Id public Long getId() { return id; } See Also: Column GeneratedValue Since: JPA 1.0 The JPA

        @ GeneratedValue (strategy = GenerationType.AUTO)    ... ; @Id         @ GeneratedValue (strategy = GenerationType.AUTO ... A {         @Id @ GeneratedValue long id;     

; import javax.persistence . EntityManager ; import javax.persistence . GeneratedValue ; import javax ... A {          @Id          @ GeneratedValue ... ;   @Id          @ GeneratedValue ( strategy = IDENTITY )  

extends AbstractEntity implements IAbstractEntity { @Id @Column(name = "account_id") @ GeneratedValue ... { @Id @Column(name = "project_id") @ GeneratedValue (strategy= GenerationType.TABLE) protected Long id