About composite

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Manual
14

Defining a JPA Entity Class [2011-02-11]

keys,  including composite primary keys and automatic sequential value generation
Manual
14

Defining a JPA Entity Class

keys,  including composite primary keys and automatic sequential value generation
JPA Doc
8

javax.persistence.MapsId

. The value element specifies the attribute within a composite key to which the relationship attribute ... ; ... } // dependent entity uses EmbeddedId for composite key @Embeddable ... within the composite key to which the relationship attribute corresponds. (Optional) The name of the attribute
Issue
5

Explorer bug ? Objects seem to be missing from database in Class view, but are present as references

: RequestBean []: Created: com.greensoft.entity.Activity [null](TEST: activity 4 (AND composite)) INFO: RequestBean []: Persisted: com.greensoft.entity.Activity [21](TEST: activity 4 (AND composite)) INFO ... []: Updated: com.greensoft.entity.Activity [21](TEST: activity 4 (AND composite)) INFO: RequestBean
JPA Doc
4

javax.persistence.EmbeddedId

javax.persistence Annotation EmbeddedId Target: Fields (including property get methods) Applied to a persistent field or property of an entity class or mapped superclass to denote a composite primary key that is an embeddable class. The embeddable class must be annotated as Embeddable
JPA Doc
4

javax.persistence.IdClass

javax.persistence Annotation IdClass Target: Classes Specifies a composite primary key class that is mapped to multiple fields or properties of the entity. The names of the fields or properties in the primary key class and the primary key fields or properties of the entity must correspond
JPA Doc
4

javax.persistence.JoinColumns

javax.persistence Annotation JoinColumns Target: Fields (including property get methods) Defines mapping for composite foreign keys. This annotation groups JoinColumn annotations for the same relationship. When the JoinColumns annotation is used, both the name and the referencedColumnName elements
JPA Doc
4

javax.persistence.MapKey

of the associated entity is used as the map key. If the primary key is a composite primary key
JPA Doc
4

javax.persistence.MapKeyJoinColumns

javax.persistence Annotation MapKeyJoinColumns Target: Fields (including property get methods) Supports composite map keys that reference entities. The MapKeyJoinColumns annotation groups MapKeyJoinColumn annotations. When the MapKeyJoinColumns annotation is used, both the name
JPA Doc
4

javax.persistence.PrimaryKeyJoinColumns

javax.persistence Annotation PrimaryKeyJoinColumns Target: Classes and fields (including property get methods) Groups PrimaryKeyJoinColumn annotations. It is used to map composite foreign keys. Example: ValuedCustomer subclass @Entity @Table(name="VCUST") @DiscriminatorValue("VCUST