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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

. 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