[[annotations]]
== Mapping annotations

[[annotations-jpa]]
=== JPA annotations

[[annotations-jpa-access]]
==== `@Access`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Access.html[`@Access`] annotation is used to specify the access type of the associated entity class, mapped superclass, or embeddable class, or entity attribute.

See the <<chapters/domain/access.adoc#access,Access type>> section for more info.

[[annotations-jpa-associationoverride]]
==== `@AssociationOverride`

The http://docs.oracle.com/javaee/7/api/javax/persistence/AssociationOverride.html[`@AssociationOverride`] annotation is used to override an association mapping (e.g. `@ManyToOne`, `@OneToOne`, `@OneToMany`, `@ManyToMany`) inherited from a mapped superclass or an embeddable.

[[annotations-jpa-associationoverrides]]
==== `@AssociationOverrides`

The http://docs.oracle.com/javaee/7/api/javax/persistence/AssociationOverrides.html[`@AssociationOverrides`] is used to group several <<annotations-jpa-associationoverride>> annotations.

[[annotations-jpa-attributeoverride]]
==== `@AttributeOverride`

The http://docs.oracle.com/javaee/7/api/javax/persistence/AttributeOverride.html[`@AttributeOverride`] annotation is used to override an attribute mapping inherited from a mapped superclass or an embeddable.

[[annotations-jpa-attributeoverrides]]
==== `@AttributeOverrides`

The http://docs.oracle.com/javaee/7/api/javax/persistence/AttributeOverrides.html[`@AttributeOverrides`] is used to group several <<annotations-jpa-attributeoverride>> annotations.

[[annotations-jpa-basic]]
==== `@Basic`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Basic.html[`@Basic`] annotation is used to map a basic attribute type to a database column.

See the <<chapters/domain/basic_types.adoc#basic,Basic types>> chapter for more info.

[[annotations-jpa-cacheable]]
==== `@Cacheable`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Cacheable.html[`@Cacheable`] annotation is used to specify whether an entity should be stored in the second-level cache.

If the `persistence.xml` `shared-cache-mode` XML attribute is set to `ENABLE_SELECTIVE`, then only the entities annotated with the `@Cacheable` are going to be stored in the second-level cache.

If `shared-cache-mode` XML attribute value is `DISABLE_SELECTIVE`, then the entities marked with the `@Cacheable` annotation are not going to be stored in the second-level cache, while all the other entities are stored in the cache.

See the <<chapters/caching/Caching.adoc#caching,Caching>> chapter for more info.

[[annotations-jpa-collectiontable]]
==== `@CollectionTable`

The http://docs.oracle.com/javaee/7/api/javax/persistence/CollectionTable.html[`@CollectionTable`] annotation is used to specify the database table that stores the values of a basic or an embeddable type collection.

See the <<chapters/domain/embeddables.adoc#embeddable-collections,Collections of embeddable types>> section for more info.

[[annotations-jpa-column]]
==== `@Column`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Column.html[`@Column`] annotation is used to specify the mapping between a basic entity attribute and the database table column.

See the <<chapters/domain/basic_types.adoc#basic-column-annotation, `@Column` annotation>> section for more info.

[[annotations-jpa-columnresult]]
==== `@ColumnResult`

The http://docs.oracle.com/javaee/7/api/javax/persistence/ColumnResult.html[`@ColumnResult`] annotation is used in conjunction with the <<annotations-jpa-sqlresultsetmapping>> or <<annotations-jpa-constructorresult>> annotations to map a SQL column for a given SELECT query.

See the <<chapters/query/native/Native.adoc#sql-composite-key-entity-associations_named-query-example, Entity associations with named native queries>> section for more info.

[[annotations-jpa-constructorresult]]
==== `@ConstructorResult`

The http://docs.oracle.com/javaee/7/api/javax/persistence/ConstructorResult.html[`@ConstructorResult`] annotation is used in conjunction with the <<annotations-jpa-sqlresultsetmapping>> annotations to map columns of a given SELECT query to a certain object constructor.

[[annotations-jpa-convert]]
==== `@Convert`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Convert.html[`@Convert`] annotation is used to specify the http://docs.oracle.com/javaee/7/api/javax/persistence/AttributeConverter.html[`AttributeConverter`] implementation used to convert the current annotated basic attribute.

If the `AttributeConverter` uses http://docs.oracle.com/javaee/7/api/javax/persistence/Converter.html#autoApply--[`autoApply`], then all entity attributes with the same target type are going to be converted automatically.

See the <<chapters/domain/basic_types.adoc#basic-enums-attribute-converter, `AttributeConverter`>> section for more info.

[[annotations-jpa-converter]]
==== `@Converter`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Converter.html[`@Converter`] annotation is used to specify that the current annotate http://docs.oracle.com/javaee/7/api/javax/persistence/AttributeConverter.html[`AttributeConverter`] implementation can be used as a JPA basic attribute converter.

If the http://docs.oracle.com/javaee/7/api/javax/persistence/Converter.html#autoApply--[`autoApply`] attribute is set to `true`, then the JPA provider will automatically convert all basic attributes with the same Java type as defined by the current converter.

See the <<chapters/domain/basic_types.adoc#basic-enums-attribute-converter, `AttributeConverter`>> section for more info.

[[annotations-jpa-converts]]
==== `@Converts`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Converts.html[`@Converts`] annotation is used to group multiple <<annotations-jpa-convert>> annotations.

See the <<chapters/domain/basic_types.adoc#basic-enums-attribute-converter, `AttributeConverter`>> section for more info.

[[annotations-jpa-discriminatorcolumn]]
==== `@DiscriminatorColumn`

The http://docs.oracle.com/javaee/7/api/javax/persistence/DiscriminatorColumn.html[`@DiscriminatorColumn`] annotation is used to specify the discriminator column name and the http://docs.oracle.com/javaee/7/api/javax/persistence/DiscriminatorColumn.html#discriminatorType--[discriminator type] for the `SINGLE_TABLE` and `JOINED` Inheritance strategies.

See the <<chapters/domain/inheritance.adoc#entity-inheritance-discriminator, Discriminator>> section for more info.

[[annotations-jpa-discriminatorvalue]]
==== `@DiscriminatorValue`

The http://docs.oracle.com/javaee/7/api/javax/persistence/DiscriminatorValue.html[`@DiscriminatorValue`] annotation is used to specify what value of the discriminator column is used for mapping the current annotated entity.

See the <<chapters/domain/inheritance.adoc#entity-inheritance-discriminator, Discriminator>> section for more info.

[[annotations-jpa-elementcollection]]
==== `@ElementCollection`

The http://docs.oracle.com/javaee/7/api/javax/persistence/ElementCollection.html[`@ElementCollection`] annotation is used to specify a collection of a basic or embeddable types.

See the <<chapters/domain/collections.adoc#collections, Collections>> section for more info.

[[annotations-jpa-embeddable]]
==== `@Embeddable`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Embeddable.html[`@Embeddable`] annotation is used to specify embeddable types. Like basic types, embeddable types do not have any identity, being managed by their owning entity.

See the <<chapters/domain/embeddables.adoc#embeddables, Embeddables>> section for more info.

[[annotations-jpa-embedded]]
==== `@Embedded`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Embedded.html[`@Embedded`] annotation is used to specify that a given entity attribute represents an embeddable type.

See the <<chapters/domain/embeddables.adoc#embeddables, Embeddables>> section for more info.

[[annotations-jpa-embeddedid]]
==== `@EmbeddedId`

The http://docs.oracle.com/javaee/7/api/javax/persistence/EmbeddedId.html[`@EmbeddedId`] annotation is used to specify the entity identifier is an embeddable type.

See the <<chapters/domain/identifiers.adoc#identifiers-composite-aggregated, Composite identifiers with `@EmbeddedId`>> section for more info.

[[annotations-jpa-entity]]
==== `@Entity`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Entity.html[`@Entity`] annotation is used to specify that the currently annotate class represents an entity type.
Unlike basic and embeddable types, entity types have an identity and their state is managed by the underlying Persistence Context.

See the <<chapters/domain/entity.adoc#entity, Entity>> section for more info.

[[annotations-jpa-entitylisteners]]
==== `@EntityListeners`

The http://docs.oracle.com/javaee/7/api/javax/persistence/EntityListeners.html[`@EntityListeners`] annotation is used to specify an array of callback listener classes that are used by the current annotated entity.

See the <<chapters/events/Events.adoc#events-jpa-callbacks-example, JPA callbacks>> section for more info.

[[annotations-jpa-entityresult]]
==== `@EntityResult`

The http://docs.oracle.com/javaee/7/api/javax/persistence/EntityResult.html[`@EntityResult`] annotation is used with the <<annotations-jpa-sqlresultsetmapping>> annotation to map the selected columns to an entity.

See the <<chapters/query/native/Native.adoc#sql-composite-key-entity-associations_named-query-example, Entity associations with named native queries>> section for more info.

[[annotations-jpa-enumerated]]
==== `@Enumerated`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Enumerated.html[`@Enumerated`] annotation is used to specify that an entity attribute represents an enumerated type.

See the <<chapters/domain/basic_types.adoc#basic-enums-Enumerated, `@Enumerated` basic type>> section for more info.

[[annotations-jpa-excludedefaultlisteners]]
==== `@ExcludeDefaultListeners`

The http://docs.oracle.com/javaee/7/api/javax/persistence/ExcludeDefaultListeners.html[`@ExcludeDefaultListeners`] annotation is used to specify that the current annotated entity skips the invocation of any default listener.

[[annotations-jpa-excludesuperclasslisteners]]
==== `@ExcludeSuperclassListeners`

The http://docs.oracle.com/javaee/7/api/javax/persistence/ExcludeSuperclassListeners.html[`@ExcludeSuperclassListeners`]  annotation is used to specify that the current annotated entity skips the invocation of listeners declared by its superclass.

[[annotations-jpa-fieldresult]]
==== `@FieldResult`

The http://docs.oracle.com/javaee/7/api/javax/persistence/FieldResult.html[`@FieldResult`] annotation is used with the <<annotations-jpa-entityresult>> annotation to map the selected columns to the fields of some specific entity.

See the <<chapters/query/native/Native.adoc#sql-composite-key-entity-associations_named-query-example, Entity associations with named native queries>> section for more info.

[[annotations-jpa-foreignkey]]
==== `@ForeignKey`

The http://docs.oracle.com/javaee/7/api/javax/persistence/ForeignKey.html[`@ForeignKey`] annotation is used to specify the associated foreign key of a <<annotations-jpa-joincolumn>> mapping.
The `@ForeignKey` annotation is only used if the automated schema generation tool is enabled, in which case, it allows you to customize the underlying foreign key definition.

See the <<chapters/domain/associations.adoc#associations-many-to-one-example,`@ManyToOne` with `@ForeignKey`>> section for more info.

[[annotations-jpa-generatedvalue]]
==== `@GeneratedValue`

The http://docs.oracle.com/javaee/7/api/javax/persistence/GeneratedValue.html[`@GeneratedValue`] annotation specifies that the entity identifier value is automatically generated using an identity column, a database sequence, or a table generator.
Hibernate supports the `@GeneratedValue` mapping even for `UUID` identifiers.

See the <<chapters/domain/identifiers.adoc#identifiers-simple-generated,Automatically-generated identifiers>> section for more info.

[[annotations-jpa-id]]
==== `@Id`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Id.html[`@Id`] annotation specifies the entity identifier.
An entity must always have an identifier attribute which is used when loading the entity in a given Persistence Context.

See the <<chapters/domain/identifiers.adoc#identifiers,Identifiers>> section for more info.

[[annotations-jpa-idclass]]
==== `@IdClass`

The http://docs.oracle.com/javaee/7/api/javax/persistence/IdClass.html[`@IdClass`] annotation is used if the current entity defined a composite identifier.
A separate class encapsulates all the identifier attributes, which are mirrored by the current entity mapping.

See the <<chapters/domain/identifiers.adoc#identifiers-composite-nonaggregated,Composite identifiers with `@IdClass`>> section for more info.

[[annotations-jpa-index]]
==== `@Index`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Index.html[`@Index`] annotation is used by the automated schema generation tool to create a database index.

[[annotations-jpa-inheritance]]
==== `@Inheritance`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Inheritance.html[`@Inheritance`] annotation is used to specify the inheritance strategy of a given entity class hierarchy.

See the <<chapters/domain/inheritance.adoc#entity-inheritance,Inheritance>> section for more info.

[[annotations-jpa-joincolumn]]
==== `@JoinColumn`

The http://docs.oracle.com/javaee/7/api/javax/persistence/JoinColumn.html[`@JoinColumn`] annotation is used to specify the FOREIGN KEY column used when joining an entity association or an embeddable collection.

See the <<chapters/domain/associations.adoc#associations-many-to-one-example,`@ManyToOne` with `@JoinColumn`>> section for more info.

[[annotations-jpa-joincolumns]]
==== `@JoinColumns`

The http://docs.oracle.com/javaee/7/api/javax/persistence/JoinColumns.html[`@JoinColumns`] annotation is used to group multiple <<annotations-jpa-joincolumn>> annotations, which are used when mapping entity association or an embeddable collection using a composite identifier

[[annotations-jpa-jointable]]
==== `@JoinTable`

The http://docs.oracle.com/javaee/7/api/javax/persistence/JoinTable.html[`@JoinTable`] annotation is used to specify the link table between two other database tables.

See the <<chapters/domain/collections.adoc#collections-map-unidirectional-example, `@JoinTable` mapping>> section for more info.

[[annotations-jpa-lob]]
==== `@Lob`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Lob.html[`@Lob`] annotation is used to specify that the current annotated entity attribute represents a large object type.

See the <<chapters/domain/basic_types.adoc#basic-blob-example, `BLOB` mapping>> section for more info.

[[annotations-jpa-manytomany]]
==== `@ManyToMany`

The http://docs.oracle.com/javaee/7/api/javax/persistence/ManyToMany.html[`@ManyToMany`] annotation is used to specify a many-to-many database relationship.

See the <<chapters/domain/associations.adoc#associations-many-to-many, `@ManyToMany` mapping>> section for more info.

[[annotations-jpa-manytoone]]
==== `@ManyToOne`

The http://docs.oracle.com/javaee/7/api/javax/persistence/ManyToOne.html[`@ManyToOne`] annotation is used to specify a many-to-one database relationship.

See the <<chapters/domain/associations.adoc#associations-many-to-one, `@ManyToOne` mapping>> section for more info.

[[annotations-jpa-mapkey]]
==== `@MapKey`

The http://docs.oracle.com/javaee/7/api/javax/persistence/MapKey.html[`@MapKey`] annotation is used to specify the key of a `java.util.Map` association for which the key type is either the primary key or an attribute of the entity which represents the value of the map.

See the <<chapters/domain/collections.adoc#collections-map-unidirectional-example, `@MapKey` mapping>> section for more info.

[[annotations-jpa-mapkeyclass]]
==== `@MapKeyClass`

The http://docs.oracle.com/javaee/7/api/javax/persistence/MapKeyClass.html[`@MapKeyClass`] annotation is used to specify the type of the map key of a `java.util.Map` associations.

[[annotations-jpa-mapkeycolumn]]
==== `@MapKeyColumn`

The http://docs.oracle.com/javaee/7/api/javax/persistence/MapKeyColumn.html[`@MapKeyColumn`] annotation is used to specify the database column which stores the key of a `java.util.Map` association for which the map key is a basic type.

[[annotations-jpa-mapkeyenumerated]]
==== `@MapKeyEnumerated`

The http://docs.oracle.com/javaee/7/api/javax/persistence/MapKeyEnumerated.html[`@MapKeyEnumerated`] annotation is used to specify that the key of `java.util.Map` association is a Java Enum.

See the <<chapters/domain/collections.adoc#collections-map-bidirectional-example, `@MapKeyEnumerated` mapping>> section for more info.

[[annotations-jpa-mapkeyjoincolumn]]
==== `@MapKeyJoinColumn`

The http://docs.oracle.com/javaee/7/api/javax/persistence/MapKeyJoinColumn.html[`@MapKeyJoinColumn`] annotation is used to specify that the key of `java.util.Map` association is an entity association.
The map key column is a FOREIGN KEY in a link table that also joins the `Map` owner's table with the table where the `Map` value resides.

See the <<chapters/domain/collections.adoc#collections-map-value-type-entity-key-example, `@MapKeyJoinColumn` mapping>> section for more info.

[[annotations-jpa-mapkeyjoincolumns]]
==== `@MapKeyJoinColumns`

The http://docs.oracle.com/javaee/7/api/javax/persistence/MapKeyJoinColumns.html[`@MapKeyJoinColumns`] annotation is used to group several <<annotations-jpa-mapkeyjoincolumn>> mappings when the `java.util.Map` association key uses a composite identifier.

[[annotations-jpa-mapkeytemporal]]
==== `@MapKeyTemporal`

The http://docs.oracle.com/javaee/7/api/javax/persistence/MapKeyTemporal.html[`@MapKeyTemporal`] annotation is used to specify that the key of `java.util.Map` association is a http://docs.oracle.com/javaee/7/api/javax/persistence/TemporalType.html[`@TemporalType`] (e.g. `DATE`, `TIME`, `TIMESTAMP`).

See the <<chapters/domain/collections.adoc#collections-map-unidirectional-example, `@MapKeyTemporal` mapping>> section for more info.

[[annotations-jpa-mappedsuperclass]]
==== `@MappedSuperclass`

The http://docs.oracle.com/javaee/7/api/javax/persistence/MappedSuperclass.html[`@MappedSuperclass`] annotation is used to specify that the current annotated type attributes are inherited by any subclass entity.

See the <<chapters/domain/inheritance.adoc#entity-inheritance-mapped-superclass, `@MappedSuperclass`>> section for more info.

[[annotations-jpa-mapsid]]
==== `@MapsId`

The http://docs.oracle.com/javaee/7/api/javax/persistence/MapsId.html[`@MapsId`] annotation is used to specify that the entity identifier is mapped by the current annotated `@ManyToOne` or `@OneToOne` association.

See the <<chapters/domain/identifiers.adoc#identifiers-derived-mapsid, `@MapsId` mapping>> section for more info.

[[annotations-jpa-namedattributenode]]
==== `@NamedAttributeNode`

The http://docs.oracle.com/javaee/7/api/javax/persistence/NamedAttributeNode.html[`@NamedAttributeNode`] annotation is used to specify each individual attribute node that needs to be fetched by an Entity Graph.

See the <<chapters/fetching/Fetching.adoc#fetching-strategies-dynamic-fetching-entity-graph-example, Fetch graph>> section for more info.

[[annotations-jpa-namedentitygraph]]
==== `@NamedEntityGraph`

The http://docs.oracle.com/javaee/7/api/javax/persistence/NamedEntityGraph.html[`@NamedEntityGraph`] annotation is used to specify an Entity Graph that can be used by an entity query to override the default fetch plan.

See the <<chapters/fetching/Fetching.adoc#fetching-strategies-dynamic-fetching-entity-graph-example, Fetch graph>> section for more info.

[[annotations-jpa-namedentitygraphs]]
==== `@NamedEntityGraphs`

The http://docs.oracle.com/javaee/7/api/javax/persistence/NamedEntityGraphs.html[`@NamedEntityGraphs`] annotation is used to group multiple <<annotations-jpa-namedentitygraph>> annotations.

[[annotations-jpa-namednativequeries]]
==== `@NamedNativeQueries`

The http://docs.oracle.com/javaee/7/api/javax/persistence/NamedNativeQueries.html[`@NamedNativeQueries`] annotation is used to group multiple <<annotations-jpa-namednativequery>> annotations.

See the <<chapters/query/native/Native.adoc#sql-custom-crud-example, Custom CRUD mapping>> section for more info.

[[annotations-jpa-namednativequery]]
==== `@NamedNativeQuery`

The http://docs.oracle.com/javaee/7/api/javax/persistence/NamedNativeQuery.html[`@NamedNativeQuery`] annotation is used to specify a native SQL query that can be retrieved later by its name.

See the <<chapters/query/native/Native.adoc#sql-custom-crud-example, Custom CRUD mapping>> section for more info.

[[annotations-jpa-namedqueries]]
==== `@NamedQueries`

The http://docs.oracle.com/javaee/7/api/javax/persistence/NamedQueries.html[`@NamedQueries`] annotation is used to group multiple <<annotations-jpa-namedquery>> annotations.

[[annotations-jpa-namedquery]]
==== `@NamedQuery`

The http://docs.oracle.com/javaee/7/api/javax/persistence/NamedQuery.html[`@NamedQuery`] annotation is used to specify a JPQL query that can be retrieved later by its name.

[[annotations-jpa-namedstoredprocedurequeries]]
==== `@NamedStoredProcedureQueries`

The http://docs.oracle.com/javaee/7/api/javax/persistence/NamedStoredProcedureQueries.html[`@NamedStoredProcedureQueries`] annotation is used to group multiple <<annotations-jpa-namedstoredprocedurequery>> annotations.

[[annotations-jpa-namedstoredprocedurequery]]
==== `@NamedStoredProcedureQuery`

The http://docs.oracle.com/javaee/7/api/javax/persistence/NamedStoredProcedureQuery.html[`@NamedStoredProcedureQuery`] annotation is used to specify a stored procedure query that can be retrieved later by its name.

[[annotations-jpa-namedsubgraph]]
==== `@NamedSubgraph`

The http://docs.oracle.com/javaee/7/api/javax/persistence/NamedSubgraph.html[`@NamedSubgraph`] annotation used to specify a subgraph in an Entity Graph.

[[annotations-jpa-onetomany]]
==== `@OneToMany`

The http://docs.oracle.com/javaee/7/api/javax/persistence/OneToMany.html[`@OneToMany`] annotation is used to specify a one-to-many database relationship.

See the <<chapters/domain/associations.adoc#associations-one-to-many, `@OneToMany` mapping>> section for more info.

[[annotations-jpa-onetoone]]
==== `@OneToOne`

The http://docs.oracle.com/javaee/7/api/javax/persistence/OneToOne.html[`@OneToOne`] annotation is used to specify a one-to-one database relationship.

See the <<chapters/domain/associations.adoc#associations-one-to-one, `@OneToOne` mapping>> section for more info.

[[annotations-jpa-orderby]]
==== `@OrderBy`

The http://docs.oracle.com/javaee/7/api/javax/persistence/OrderBy.html[`@OrderBy`] annotation is used to specify the entity attributes used for sorting when fetching the current annotated collection.

See the <<chapters/domain/collections.adoc#collections-unidirectional-ordered-list, `@OrderBy` mapping>> section for more info.

[[annotations-jpa-ordercolumn]]
==== `@OrderColumn`

The http://docs.oracle.com/javaee/7/api/javax/persistence/OrderColumn.html[`@OrderColumn`] annotation is used to specify that the current annotation collection order should be materialized in the database.

See the <<chapters/domain/collections.adoc#collections-unidirectional-ordered-list-order-column-example, `@OrderColumn` mapping>> section for more info.

[[annotations-jpa-persistencecontext]]
==== `@PersistenceContext`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PersistenceContext.html[`@PersistenceContext`] annotation is used to specify the `EntityManager` that needs to be injected as a dependency.

[[annotations-jpa-persistencecontexts]]
==== `@PersistenceContexts`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PersistenceContexts.html[`@PersistenceContexts`] annotation is used to group multiple <<annotations-jpa-persistencecontext>> annotations.

[[annotations-jpa-persistenceproperty]]
==== `@PersistenceProperty`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PersistenceProperty.html[`@PersistenceProperty`] annotation is used by the <<annotations-jpa-persistencecontext>> annotation to declare JPA provider properties that are passed to the underlying container when the `EntityManager` instance is created.

[[annotations-jpa-persistenceunit]]
==== `@PersistenceUnit`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PersistenceUnit.html[`@PersistenceUnit`] annotation is used to specify the `EntityManagerFactory` that needs to be injected as a dependency.

[[annotations-jpa-persistenceunits]]
==== `@PersistenceUnits`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PersistenceUnits.html[`@PersistenceUnits`] annotation is used to group multiple <<annotations-jpa-persistenceunit>> annotations.

[[annotations-jpa-postload]]
==== `@PostLoad`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PostLoad.html[`@PostLoad`] annotation is used to specify a callback method that fires after an entity is loaded.

See the <<chapters/events/Events.adoc#events-jpa-callbacks-example, JPA callbacks>> section for more info.

[[annotations-jpa-postpersist]]
==== `@PostPersist`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PostPersist.html[`@PostPersist`] annotation is used to specify a callback method that fires after an entity is persisted.

See the <<chapters/events/Events.adoc#events-jpa-callbacks-example, JPA callbacks>> section for more info.

[[annotations-jpa-postremove]]
==== `@PostRemove`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PostRemove.html[`@PostRemove`] annotation is used to specify a callback method that fires after an entity is removed.

See the <<chapters/events/Events.adoc#events-jpa-callbacks-example, JPA callbacks>> section for more info.

[[annotations-jpa-postupdate]]
==== `@PostUpdate`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PostUpdate.html[`@PostUpdate`] annotation is used to specify a callback method that fires after an entity is updated.

See the <<chapters/events/Events.adoc#events-jpa-callbacks-example, JPA callbacks>> section for more info.

[[annotations-jpa-prepersist]]
==== `@PrePersist`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PrePersist.html[`@PrePersist`] annotation is used to specify a callback method that fires before an entity is persisted.

See the <<chapters/events/Events.adoc#events-jpa-callbacks-example, JPA callbacks>> section for more info.

[[annotations-jpa-preremove]]
==== `@PreRemove`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PreRemove.html[`@PreRemove`] annotation is used to specify a callback method that fires before an entity is removed.

See the <<chapters/events/Events.adoc#events-jpa-callbacks-example, JPA callbacks>> section for more info.

[[annotations-jpa-preupdate]]
==== `@PreUpdate`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PreUpdate.html[`@PreUpdate`] annotation is used to specify a callback method that fires before an entity is updated.

See the <<chapters/events/Events.adoc#events-jpa-callbacks-example, JPA callbacks>> section for more info.

[[annotations-jpa-primarykeyjoincolumn]]
==== `@PrimaryKeyJoinColumn`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PrimaryKeyJoinColumn.html[`@PrimaryKeyJoinColumn`] annotation is used to specify that the primary key column of the current annotated entity is also a foreign key to some other entity
(e.g. a base class table in a `JOINED` inheritance strategy, the primary table in a secondary table mapping, or the parent table in a `@OneToOne` relationship).

See the <<chapters/domain/identifiers.adoc#identifiers-derived-primarykeyjoincolumn, `@PrimaryKeyJoinColumn` mapping>> section for more info.

[[annotations-jpa-primarykeyjoincolumns]]
==== `@PrimaryKeyJoinColumns`

The http://docs.oracle.com/javaee/7/api/javax/persistence/PrimaryKeyJoinColumns.html[`@PrimaryKeyJoinColumns`] annotation is used to group multiple <<annotations-jpa-primarykeyjoincolumn>> annotations.

[[annotations-jpa-queryhint]]
==== `@QueryHint`

The http://docs.oracle.com/javaee/7/api/javax/persistence/QueryHint.html[`@QueryHint`] annotation is used to specify a JPA provider hint used by a `@NamedQuery` or a `@NamedNativeQuery` annotation.

[[annotations-jpa-secondarytable]]
==== `@SecondaryTable`

The http://docs.oracle.com/javaee/7/api/javax/persistence/SecondaryTable.html[`@SecondaryTable`] annotation is used to specify a secondary table for the current annotated entity.

See the <<chapters/query/native/Native.adoc#sql-custom-crud-secondary-table-example, `@SecondaryTable` mapping>> section for more info.

[[annotations-jpa-secondarytables]]
==== `@SecondaryTables`

The http://docs.oracle.com/javaee/7/api/javax/persistence/SecondaryTables.html[`@SecondaryTables`] annotation is used to group multiple <<annotations-jpa-secondarytable>> annotations.

[[annotations-jpa-sequencegenerator]]
==== `@SequenceGenerator`

The http://docs.oracle.com/javaee/7/api/javax/persistence/SequenceGenerator.html[`@SequenceGenerator`] annotation is used to specify the database sequence used by the identifier generator of the current annotated entity.

[[annotations-jpa-sqlresultsetmapping]]
==== `@SqlResultSetMapping`

The http://docs.oracle.com/javaee/7/api/javax/persistence/SqlResultSetMapping.html[`@SqlResultSetMapping`] annotation is used to specify the `ResultSet` mapping of a native SQL query or stored procedure.

See the <<chapters/query/native/Native.adoc#sql-composite-key-entity-associations_named-query-example, `SqlResultSetMapping` mapping>> section for more info.

[[annotations-jpa-sqlresultsetmappings]]
==== `@SqlResultSetMappings`

The http://docs.oracle.com/javaee/7/api/javax/persistence/SqlResultSetMappings.html[`@SqlResultSetMappings`] annotation is group multiple <<annotations-jpa-sqlresultsetmapping>> annotations.

[[annotations-jpa-storedprocedureparameter]]
==== `@StoredProcedureParameter`

The http://docs.oracle.com/javaee/7/api/javax/persistence/StoredProcedureParameter.html[`@StoredProcedureParameter`] annotation is used to specify a parameter of a <<annotations-jpa-namedstoredprocedurequery>>.

[[annotations-jpa-table]]
==== `@Table`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Table.html[`@Table`] annotation is used to specify the primary table of the current annotated entity.

See the <<chapters/query/native/Native.adoc#sql-custom-crud-secondary-table-example, `@Table` mapping>> section for more info.

[[annotations-jpa-tablegenerator]]
==== `@TableGenerator`

The http://docs.oracle.com/javaee/7/api/javax/persistence/TableGenerator.html[`@TableGenerator`] annotation is used to specify the database table used by the identity generator of the current annotated entity.

[[annotations-jpa-temporal]]
==== `@Temporal`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Temporal.html[`@Temporal`] annotation is used to specify the `TemporalType` of the current annotated `java.util.Date` or `java.util.Calendar` entity attribute.

See the <<chapters/domain/basic_types.adoc#basic-datetime,Basic temporal types>> chapter for more info.

[[annotations-jpa-transient]]
==== `@Transient`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Transient.html[`@Transient`] annotation is used to specify that a given entity attribute should not be persisted.

See the <<chapters/events/Events.adoc#events-jpa-callbacks-example, `@Transient` mapping>> section for more info.

[[annotations-jpa-uniqueconstraint]]
==== `@UniqueConstraint`

The http://docs.oracle.com/javaee/7/api/javax/persistence/UniqueConstraint.html[`@UniqueConstraint`] annotation is used to specify a unique constraint to be included by the automated schema generator for the primary or secondary table associated with the current annotated entity.

[[annotations-jpa-version]]
==== `@Version`

The http://docs.oracle.com/javaee/7/api/javax/persistence/Version.html[`@Version`] annotation is used to specify the version attribute used for optimistic locking.

See the <<chapters/domain/entity.adoc#entity-pojo-optlock, Optimistic locking mapping>> section for more info.

[[annotations-hibernate]]
=== Hibernate annotations

[[annotations-hibernate-accesstype]]
==== [line-through]#`@AccessType`#

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/AccessType.html[[line-through]#`@AccessType`#] annotation is deprecated.
You should use either the JPA <<annotations-jpa-access>> or the Hibernate native <<annotations-hibernate-attributeaccessor>> annotation.

[[annotations-hibernate-any]]
==== `@Any`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Any.html[`@Any`] annotation is used to define the *any-to-one* association
which can point to one one of several entity types.

See the <<chapters/domain/basic_types.adoc#mapping-column-any,`@Any` mapping>> section for more info.

[[annotations-hibernate-anymetadef]]
==== `@AnyMetaDef`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/AnyMetaDef.html[`@AnyMetaDef`] annotation is used to provide metadata about an `@Any` or `@ManyToAny` mapping.

See the <<chapters/domain/basic_types.adoc#mapping-column-any,`@Any` mapping>> section for more info.

[[annotations-hibernate-anymetadefs]]
==== `@AnyMetaDefs`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/AnyMetaDefs.html[`@AnyMetaDefs`] annotation is used to group multiple <<annotations-hibernate-anymetadef>> annotations.

[[annotations-hibernate-attributeaccessor]]
==== `@AttributeAccessor`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/AttributeAccessor.html[`@AttributeAccessor`] annotation is used to specify a custom https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/property/access/spi/PropertyAccessStrategy.html[`PropertyAccessStrategy`].

Should only be used to name a custom `PropertyAccessStrategy`.
For property/field access type, the JPA <<annotations-jpa-access>> annotation should be preferred.

However, if this annotation is used with either value="property" or value="field", it will act just as the corresponding usage of the JPA <<annotations-jpa-access>> annotation.

[[annotations-hibernate-batchsize]]
==== `@BatchSize`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/BatchSize.html[`@BatchSize`] annotation is used to specify the size for batch loading the entries of a lazy collection.

[[annotations-hibernate-cache]]
==== `@Cache`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Cache.html[`@Cache`] annotation is used to specify the https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/CacheConcurrencyStrategy.html[`CacheConcurrencyStrategy`] of a root entity or a collection.

See the <<chapters/caching/Caching.adoc#caching,Caching>> chapter for more info.

[[annotations-hibernate-cascade]]
==== `@Cascade`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Cascade.html[`@Cascade`] annotation is used to apply the Hibernate specific http://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/CascadeType.html[`CascadeType`] strategies (e.g. `CascadeType.LOCK`, `CascadeType.SAVE_UPDATE`, `CascadeType.REPLICATE`) on a given association.

For JPA cascading, prefer using the http://docs.oracle.com/javaee/7/api/javax/persistence/CascadeType.html[`javax.persistence.CascadeType`] instead.

When combining both JPA and Hibernate `CascadeType` strategies, Hibernate will merge both sets of cascades.

[[annotations-hibernate-check]]
==== `@Check`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Check.html[`@Check`] annotation is used to specify an arbitrary SQL CHECK constraint which can be defined at the class, property or collection level.

[[annotations-hibernate-collectionid]]
==== `@CollectionId`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/CollectionId.html[`@CollectionId`] annotation is used to specify an identifier column for an idbag collection.

You might want to use the JPA <<annotations-jpa-ordercolumn>> instead.

[[annotations-hibernate-collectiontype]]
==== `@CollectionType`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/CollectionType.html[`@CollectionType`] annotation is used to specify a custom collection type.

The collection can also name a <<annotations-hibernate-type>>, which defines the Hibernate Type of the collection elements.

[[annotations-hibernate-columndefault]]
==== `@ColumnDefault`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/ColumnDefault.html[`@ColumnDefault`] annotation is used to specify the `DEFAULT` DDL value to apply when using the automated schema generator.

The same behavior can be achieved using the `definition` attribute of the JPA <<annotations-jpa-column>> annotation.

[[annotations-hibernate-columns]]
==== `@Columns`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Columns.html[`@Columns`] annotation is used to group multiple JPA <<annotations-jpa-column>> annotations.

See the <<chapters/domain/basic_types.adoc#mapping-column-read-and-write-composite-type-example,`@Columns` mapping>> section for more info.

[[annotations-hibernate-columntransformer]]
==== `@ColumnTransformer`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/ColumnTransformer.html[`@ColumnTransformer`] annotation is used to customize how a given column value is read from or write into the database.

See the <<chapters/domain/basic_types.adoc#mapping-column-read-and-write-example,`@ColumnTransformer` mapping>> section for more info.

[[annotations-hibernate-columntransformers]]
==== `@ColumnTransformers`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/ColumnTransformers.html[`@ColumnTransformers`] annotation iis used to group multiple <<annotations-hibernate-columntransformer>> annotations.

[[annotations-hibernate-creationtimestamp]]
==== `@CreationTimestamp`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/CreationTimestamp.html[`@CreationTimestamp`] annotation is used to specify that the current annotated temporal type must be initialized with the current JVM timestamp value.

Supported attribute types:

- `java.util.Date`
- `java.util.Calendar`
- `java.sql.Date`
- `java.sql.Time`
- `java.sql.Timestamp`

[[annotations-hibernate-discriminatorformula]]
==== `@DiscriminatorFormula`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/DiscriminatorFormula.html[`@DiscriminatorFormula`] annotation is used to specify a Hibernate <<annotations-hibernate-formula>> to resolve the inheritance discriminator value.

See the <<chapters/domain/inheritance.adoc#entity-inheritance-single-table-discriminator-formula-example, `@DiscriminatorFormula`>> section for more info.

[[annotations-hibernate-discriminatoroptions]]
==== `@DiscriminatorOptions`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/DiscriminatorOptions.html[`@DiscriminatorOptions`] annotation is used to provide the `force` and `insert` Discriminator properties.

See the <<chapters/domain/inheritance.adoc#entity-inheritance-discriminator, Discriminator>> section for more info.

[[annotations-hibernate-dynamicinsert]]
==== `@DynamicInsert`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/DynamicInsert.html[`@DynamicInsert`] annotation is used to specify that the `INSERT` SQL statement should be generated whenever an entity is to be persisted.

By default, Hibernate uses a cached `INSERT` statement that sets all table columns.
When the entity is annotated with the `@DynamicInsert` annotation, the `PreparedStatement` is going to include only the non-null columns.

[[annotations-hibernate-dynamicupdate]]
==== `@DynamicUpdate`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/DynamicUpdate.html[`@DynamicUpdate`] annotation is used to specify that the `UPDATE` SQL statement should be generated whenever an entity is modified.

By default, Hibernate uses a cached `UPDATE` statement that sets all table columns.
When the entity is annotated with the `@DynamicUpdate` annotation, the `PreparedStatement` is going to include only the columns whose values have been changed.

[NOTE]
====
For reattachment of detached entities, the dynamic update is not possible without having the <<annotations-hibernate-selectbeforeupdate>> annotation as well.
====

[[annotations-hibernate-entity]]
==== [line-through]#`@Entity`#

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Entity.html[[line-through]#`@Entity`#] annotation is deprecated. Use the JPA <<annotations-jpa-entity>> annotation instead.

[[annotations-hibernate-fetch]]
==== `@Fetch`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Fetch.html[`@Fetch`] annotation is used to specify the Hibernate specific https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/FetchMode.html[`FetchMode`] (e.g. `JOIN`, `SELECT`, `SUBSELECT`) used for the current annotated association:

[[annotations-hibernate-fetchprofile]]
==== `@FetchProfile`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/FetchProfile.html[`@FetchProfile`] annotation is used to specify a custom fetching profile, similar to a JPA Entity Graph.

See the <<chapters/fetching/Fetching.adoc#fetching-strategies-dynamic-fetching-profile-example, Fetch mapping>> section for more info.

[[annotations-hibernate-fetchprofile-fetchoverride]]
==== `@FetchProfile.FetchOverride`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/FetchProfile.FetchOverride.html[`@FetchProfile.FetchOverride`] annotation is used in conjunction with the <<annotations-hibernate-fetchprofile>> annotation,
and it's used for overriding the fetching strategy of a particular entity association.

See the <<chapters/fetching/Fetching.adoc#fetching-strategies-dynamic-fetching-profile-example, Fetch profile>> section for more info.

[[annotations-hibernate-fetchprofiles]]
==== `@FetchProfiles`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/FetchProfiles.html[`@FetchProfiles`] annotation is used to group multiple <<annotations-hibernate-fetchprofile>> annotations.

[[annotations-hibernate-filter]]
==== `@Filter`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Filter.html[`@Filter`] annotation is used to add filters to an entity or the target entity of a collection.

See the <<chapters/domain/basic_types.adoc#mapping-filter-example,Filter mapping>> section for more info.

[[annotations-hibernate-filterdef]]
==== `@FilterDef`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/FilterDef.html[`@FilterDef`] annotation is used to specify a `@Filter` definition (name, default condition and parameter types, if any).

See the <<chapters/domain/basic_types.adoc#mapping-filter-example,Filter mapping>> section for more info.

[[annotations-hibernate-filterdefs]]
==== `@FilterDefs`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/FilterDefs.html[`@FilterDefs`] annotation is used to group multiple <<annotations-hibernate-filterdef>> annotations.
[[annotations-hibernate-filterjointable]]
==== `@FilterJoinTable`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/FilterJoinTable.html[`@FilterJoinTable`] annotation is used to add `@Filter` capabilities to a join table collection.

[[annotations-hibernate-filterjointables]]
==== `@FilterJoinTables`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/FilterJoinTables.html[`@FilterJoinTables`] annotation is used to group multiple <<annotations-hibernate-filterjointable>> annotations.

[[annotations-hibernate-filters]]
==== `@Filters`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Filters.html[`@Filters`] annotation is used to group multiple <<annotations-hibernate-filter>> annotations.

==== [line-through]#`@ForeignKey`#

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/ForeignKey.html[[line-through]#`@ForeignKey`#] annotation is deprecated. Use the JPA 2.1 <<annotations-jpa-foreignkey>> annotation instead.

[[annotations-hibernate-formula]]
==== `@Formula`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Formula.html[`@Formula`] annotation is used to specify an SQL fragment that is executed in order to populate a given entity attribute.

See the <<chapters/domain/basic_types.adoc#mapping-column-formula-example,`@Formula` mapping>> section for more info.

[[annotations-hibernate-generated]]
==== `@Generated`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Generated.html[`@Generated`] annotation is used to specify that the current annotated entity attribute is generated by the database.

[[annotations-hibernate-generatortype]]
==== `@GeneratorType`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/GeneratorType.html[`@GeneratorType`] annotation is used to provide a https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/tuple/ValueGenerator.html[`ValueGenerator`]
and a https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/GenerationTime.html[`GenerationTime`] for the current annotated generated attribute.

[[annotations-hibernate-genericgenerator]]
==== `@GenericGenerator`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/GenericGenerator.html[`@GenericGenerator`] annotation can be used to configure any Hibernate identifier generator.

[[annotations-hibernate-genericgenerators]]
==== `@GenericGenerators`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/GenericGenerators.html[`@GenericGenerators`] annotation is used to group multiple <<annotations-hibernate-genericgenerator>> annotations.

[[annotations-hibernate-immutable]]
==== `@Immutable`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Immutable.html[`@Immutable`] annotation is used to specify that the annotated entity, attribute, or collection is immutable.

See the <<chapters/domain/immutability.adoc#entity-immutability,`@Immutable` mapping>> section for more info.

[[annotations-hibernate-index]]
==== [line-through]#`@Index`#

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Index.html[[line-through]#`@Index`#] annotation is deprecated. Use the JPA <<annotations-jpa-index>> annotation instead.

[[annotations-hibernate-indexcolumn]]
==== [line-through]#`@IndexColumn`#

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/IndexColumn.html[[line-through]#`@IndexColumn`#] annotation is deprecated. Use the JPA <<annotations-jpa-ordercolumn>> annotation instead.

[[annotations-hibernate-joincolumnorformula]]
==== `@JoinColumnOrFormula`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/JoinColumnOrFormula.html[`@JoinColumnOrFormula`] annotation is used to specify that the entity association is resolved either through a FOREIGN KEY join (e.g. <<annotations-jpa-joincolumn>>) or using the result of a given SQL formula (e.g. <<annotations-hibernate-joinformula>>).

[[annotations-hibernate-joincolumnsorformulas]]
==== `@JoinColumnsOrFormulas`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/JoinColumnsOrFormulas.html[`@JoinColumnsOrFormulas`] annotation is used to group multiple <<annotations-hibernate-joincolumnorformula>> annotations.
[[annotations-hibernate-joinformula]]
==== `@JoinFormula`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/JoinFormula.html[`@JoinFormula`] annotation is used as a replacement for <<annotations-jpa-joincolumn>> when the association does not have a dedicated FOREIGN KEY column.

[[annotations-hibernate-lazycollection]]
==== `@LazyCollection`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/LazyCollection.html[`@LazyCollection`] annotation is used to specify the lazy fetching behavior of a given collection.
The possible values are given by the `https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/LazyCollectionOption.html[LazyCollectionOption]` enumeration:

`TRUE`:: Load it when the state is requested.
`FALSE`:: Eagerly load it.
`EXTRA`:: Prefer extra queries over full collection loading.

The `TRUE` and `FALSE` values are deprecated since you should be using the JPA http://docs.oracle.com/javaee/7/api/javax/persistence/FetchType.html[`FetchType`] attribute of the <<annotations-jpa-elementcollection>>, <<annotations-jpa-onetomany>>, or <<annotations-jpa-manytomany>> collection.

The `EXTRA` value has no equivalent in the JPA specification, and it's used to avoid loading the entire collection even when the collection is accessed for the first time.
Each element is fetched individually using a secondary query.

[[annotations-hibernate-lazygroup]]
==== `@LazyGroup`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/LazyGroup.html[`@LazyGroup`] annotation is used to specify that an entity attribute should be fetched along with all the other attributes belonging to the same group.

To load entity attributes lazily, bytecode enhancement is needed.
By default, all non-collection attributes are loaded in one group named "DEFAULT".

This annotation allows defining different groups of attributes to be initialized together when access one attribute in the group.

See the <<chapters/pc/BytecodeEnhancement.adoc#BytecodeEnhancement-lazy-loading-example,`@LazyGroup` mapping>> section for more info.

[[annotations-hibernate-lazytoone]]
==== `@LazyToOne`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/LazyToOne.html[`@LazyToOne`] annotation is used to specify the laziness options, represented by https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/LazyToOneOption.html[`LazyToOneOption`], available for a `@OneToOne` or `@ManyToOne` association.

`LazyToOneOption` defines the following alternatives:

FALSE:: Eagerly load the association. This one is not needed since the JPA `FetchType.EAGER` offers the same behavior.
NO_PROXY:: This option will fetch the association lazily while returning real entity object.
PROXY:: This option will fetch the association lazily while returning a proxy instead.

[[annotations-hibernate-listindexbase]]
==== `@ListIndexBase`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/ListIndexBase.html[`@ListIndexBase`] annotation is used to specify the start value for a list index, as stored in the database.

By default, `List` indexes are stored starting at zero. Generally used in conjunction with <<annotations-jpa-ordercolumn>>.

[[annotations-hibernate-loader]]
==== `@Loader`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Loader.html[`@Loader`] annotation is used to override the default `SELECT` query used for loading an entity loading.

See the <<chapters/query/native/Native.adoc#sql-custom-crud-example, Custom CRUD mapping>> section for more info.

[[annotations-hibernate-manytoany]]
==== `@ManyToAny`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/ManyToAny.html[`@ManyToAny`] annotation is used to specify a many-to-one association when the target type is dynamically resolved.

See the <<chapters/domain/basic_types.adoc#mapping-column-many-to-any, `@ManyToAny` mapping>> section for more info.

[[annotations-hibernate-mapkeytype]]
==== `@MapKeyType`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/MapKeyType.html[`@MapKeyType`] annotation is used to specify the map key type.

[[annotations-hibernate-metavalue]]
==== `@MetaValue`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/MetaValue.html[`@MetaValue`] annotation is used by the <<annotations-hibernate-anymetadef>> annotation to specify the association between a given discriminator value and an entity type.

See the <<chapters/domain/basic_types.adoc#mapping-column-any,`@Any` mapping>> section for more info.

[[annotations-hibernate-namednativequeries]]
==== `@NamedNativeQueries`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/NamedNativeQueries.html[`@NamedNativeQueries`] annotation is used to group multiple <<annotations-hibernate-namednativequery>> annotations.

[[annotations-hibernate-namednativequery]]
==== `@NamedNativeQuery`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/NamedNativeQuery.html[`@NamedNativeQuery`] annotation extends the JPA <<annotations-jpa-namednativequery>> with Hibernate specific features.

[[annotations-hibernate-namedqueries]]
==== `@NamedQueries`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/NamedQueries.html[`@NamedQueries`] annotation is used to group multiple <<annotations-hibernate-namedquery>> annotations.

[[annotations-hibernate-namedquery]]
==== `@NamedQuery`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/NamedQuery.html[`@NamedQuery`] annotation extends the JPA <<annotations-jpa-namedquery>> with Hibernate specific features.

[[annotations-hibernate-nationalized]]
==== `@Nationalized`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Nationalized.html[`@Nationalized`] annotation is used to specify that the current annotated attribute is a character type (e.g. `String`, `Character`, `Clob`) that is stored in a nationalized column type (`NVARCHAR`, `NCHAR`, `NCLOB`).

See the <<chapters/domain/basic_types.adoc#basic-nationalized-example,`@Nationalized` mapping>> section for more info.

[[annotations-hibernate-naturalid]]
==== `@NaturalId`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/NaturalId.html[`@NaturalId`] annotation is used to specify that the current annotated attribute is part of the natural id of the entity.

See the <<chapters/domain/natural_id.adoc#naturalid,Natural Ids>> section for more info.

[[annotations-hibernate-naturalidcache]]
==== `@NaturalIdCache`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/NaturalIdCache.html[`@NaturalIdCache`] annotation is used to specify that the natural id values associated with the annotated entity should be stored in the second-level cache.

See the <<chapters/domain/natural_id.adoc#naturalid-caching,`@NaturalIdCache` mapping>> section for more info.

[[annotations-hibernate-notfound]]
==== `@NotFound`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/NotFound.html[`@NotFound`] annotation is used to specify the https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/NotFoundAction.html[`NotFoundAction`] strategy for when an element is not found in a given association.

The `NotFoundAction` defines with two possibilities:

`EXCEPTION`:: An exception is thrown when an element is not found (default and recommended).
`IGNORE`:: Ignore the element when not found in the database.

[[annotations-hibernate-ondelete]]
==== `@OnDelete`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/OnDelete.html[`@OnDelete`] annotation is used to specify the delete strategy employed by the current annotated collection, array or joined subclasses.
This annotation is used by the automated schema generation tool to generated the appropriate FOREIGN KEY DDL cascade directive.

The two possible strategies are defined by the https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/OnDeleteAction.html[`OnDeleteAction`] enumeration:

CASCADE:: Use the database FOREIGN KEY cascade capabilities.
NO_ACTION:: Take no action.

[[annotations-hibernate-optimisticlock]]
==== `@OptimisticLock`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/OptimisticLock.html[`@OptimisticLock`] annotation is used to specify if the current annotated attribute will trigger an entity version increment upon being modified.

[[annotations-hibernate-optimisticlocking]]
==== `@OptimisticLocking`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/OptimisticLocking.html[`@OptimisticLocking`] annotation is used to specify the current annotated an entity optimistic locking strategy.

The four possible strategies are defined by the https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/OptimisticLockType.html[`OptimisticLockType`] enumeration:

NONE:: The implicit optimistic locking mechanism is disabled.
VERSION:: The implicit optimistic locking mechanism is using a dedicated version column.
ALL:: The implicit optimistic locking mechanism is using *all* attributes as part of an expanded WHERE clause restriction for the `UPDATE` and `DELETE` SQL statements.
DIRTY:: The implicit optimistic locking mechanism is using the *dirty* attributes (the attributes that were modified) as part of an expanded WHERE clause restriction for the `UPDATE` and `DELETE` SQL statements.

[[annotations-hibernate-orderby]]
==== `@OrderBy`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/OrderBy.html[`@OrderBy`] annotation is used to specify a *SQL* ordering directive for sorting the current annotated collection.

It differs from the JPA <<annotations-jpa-orderby>> annotation because the JPA annotation expects a JPQL order-by fragment, not an SQL directive.

[[annotations-hibernate-paramdef]]
==== `@ParamDef`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/ParamDef.html[`@ParamDef`] annotation is used in conjunction with <<annotations-hibernate-filterdef>> so that the Hibernate Filter can be customized with runtime-provided parameter values.

See the <<chapters/domain/basic_types.adoc#mapping-filter-example,Filter mapping>> section for more info.

[[annotations-hibernate-parameter]]
==== `@Parameter`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Parameter.html[`@Parameter`] annotation is generic parameter (basically a key/value combination) tused to parametrize other annotations,
like <<annotations-hibernate-collectiontype>>, <<annotations-hibernate-genericgenerator>>, and <<annotations-hibernate-type>>, <<annotations-hibernate-typedef>>.

[[annotations-hibernate-parent]]
==== `@Parent`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Parent.html[`@Parent`] annotation is used to specify that the current annotated embeddable attribute references back the owning entity.

[[annotations-hibernate-persister]]
==== `@Persister`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Persister.html[`@Persister`] annotation is used to specify a custom entity or collection persister.

For entities, the custom persister must implement the https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/persister/entity/EntityPersister.html[`EntityPersister`] interface.

For collections, the custom persister must implement the https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/persister/collection/CollectionPersister.html[`CollectionPersister`] interface.

[[annotations-hibernate-polymorphism]]
==== `@Polymorphism`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Polymorphism.html[`@Polymorphism`] annotation is used to define the https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/PolymorphismType.html[`PolymorphismType`] Hibernate will apply to entity hierarchies.

There are two possible `PolymorphismType` options:

EXPLICIT:: The current annotated entity is retrieved only if explicitly asked.
IMPLICIT:: The current annotated entity is retrieved if any of its super entity are retrieved. This is the default option.

[[annotations-hibernate-proxy]]
==== `@Proxy`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Proxy.html[`@Proxy`] annotation is used to specify a custom Proxy implementation for the current annotated entity.

[[annotations-hibernate-rowid]]
==== `@RowId`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/RowId.html[`@RowId`] annotation is used to specify the database column used as a `ROWID` pseudocolumn.
For instance, Oracle defines the https://docs.oracle.com/cd/B19306_01/server.102/b14200/pseudocolumns008.htm[`ROWID` pseudocolumn] which provides the address of every table row.

According to Oracle documentation, `ROWID` is the fastest way to access a single row from a table.

[[annotations-hibernate-selectbeforeupdate]]
==== `@SelectBeforeUpdate`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/SelectBeforeUpdate.html[`@SelectBeforeUpdate`] annotation is used to specify that the current annotated entity state be selected from the database when determining whether to perform an update when the detached entity is reattached.

[[annotations-hibernate-sort]]
==== [line-through]#`@Sort`#

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Sort.html[[line-through]#`@Sort`#] annotation is deprecated. Use the Hibernate specific <<annotations-hibernate-sortcomparator>> or <<annotations-hibernate-sortnatural>> annotations instead.

[[annotations-hibernate-sortcomparator]]
==== `@SortComparator`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/SortComparator.html[`@SortComparator`] annotation is used to specify a `Comparator` for sorting the `Set`/`Map` in-memory.

See the <<chapters/domain/collections.adoc#collections-unidirectional-sorted-set-custom-comparator-example, `@SortComparator` mapping>> section for more info.

[[annotations-hibernate-sortnatural]]
==== `@SortNatural`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/SortNatural.html[`@SortNatural`] annotation is used to specify that the `Set`/`Map` should be sorted using natural sorting.

See the <<chapters/domain/collections.adoc#collections-bidirectional-sorted-set-example, `@SortNatural` mapping>> section for more info.

[[annotations-hibernate-source]]
==== `@Source`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Source.html[`@Source`] annotation is used in conjunction with a `@Version` timestamp entity attribute indicating
the https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/SourceType.html[`SourceType`] of the timestamp value.

The `SourceType` offers two options:

DB:: Get the timestamp from the database.
VM:: Get the timestamp from the current JVM.

[[annotations-hibernate-sqldelete]]
==== `@SQLDelete`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/SQLDelete.html[`@SQLDelete`] annotation is used to specify a custom SQL `DELETE` statement for the current annotated entity or collection.

See the <<chapters/query/native/Native.adoc#sql-custom-crud-example, Custom CRUD mapping>> section for more info.

[[annotations-hibernate-sqldeleteall]]
==== `@SQLDeleteAll`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/SQLDeleteAll.html[`@SQLDeleteAll`] annotation is used to specify a custom SQL `DELETE` statement when removing all elements of the current annotated collection.

See the <<chapters/query/native/Native.adoc#sql-custom-crud-example, Custom CRUD mapping>> section for more info.

[[annotations-hibernate-sqlfragmentalias]]
==== `@SqlFragmentAlias`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/SqlFragmentAlias.html[`@SqlFragmentAlias`] annotation is used to specify an alias for a Hibernate <<annotations-hibernate-filter>>.

The alias (e.g. `myAlias`) can then be used in the `@Filter` `condition` clause using the `{alias}` (e.g. `{myAlias}`) placeholder.

[[annotations-hibernate-sqlinsert]]
==== `@SQLInsert`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/SQLInsert.html[`@SQLInsert`] annotation is used to specify a custom SQL `INSERT` statement for the current annotated entity or collection.

See the <<chapters/query/native/Native.adoc#sql-custom-crud-example, Custom CRUD mapping>> section for more info.

[[annotations-hibernate-sqlupdate]]
==== `@SQLUpdate`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/SQLUpdate.html[`@SQLUpdate`] annotation is used to specify a custom SQL `UPDATE` statement for the current annotated entity or collection.

See the <<chapters/query/native/Native.adoc#sql-custom-crud-example, Custom CRUD mapping>> section for more info.

[[annotations-hibernate-subselect]]
==== `@Subselect`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Subselect.html[`@Subselect`] annotation is used to specify an immutable and read-only entity using a custom SQL `SELECT` statement.

[[annotations-hibernate-synchronize]]
==== `@Synchronize`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Synchronize.html[`@Synchronize`] annotation is usually used in conjunction with the <<annotations-hibernate-subselect>> annotation to specify the list of database tables used by the `@Subselect` SQL query.

With this information in place, Hibernate will properly trigger an entity flush whenever a query targeting the `@Subselect` entity is to be executed while the Persistence Context has scheduled some insert/update/delete actions against the database tables used by the `@Subselect` SQL query.

Therefore, the `@Synchronize` annotation prevents the derived entity from returning stale data when executing entity queries against the `@Subselect` entity.

[[annotations-hibernate-table]]
==== `@Table`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Table.html[`@Table`] annotation is used to specify additional information to a JPA <<annotations-hibernate-table>> annotation, like custom `INSERT`, `UPDATE` or `DELETE` statements or a specific https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/FetchMode.html[`FetchMode`].

[[annotations-hibernate-tables]]
==== `@Tables`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Tables.html[`@Tables`] annotation is used to group multiple <<annotations-hibernate-table>> annotations.

[[annotations-hibernate-target]]
==== `@Target`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Target.html[`@Target`] annotation is used to specify an explicit target implementation when the current annotated association is using an interface type.

[[annotations-hibernate-tuplizer]]
==== `@Tuplizer`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Tuplizer.html[`@Tuplizer`] annotation is used to specify a custom tuplizer for the current annotated entity or embeddable.

For entities, the tupelizer must implement the https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/tuple/entity/EntityTuplizer.html[`EntityTuplizer`] interface.

For embeddables, the tupelizer must implement the https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/tuple/component/ComponentTuplizer.html[`ComponentTuplizer`] interface.

[[annotations-hibernate-tuplizers]]
==== `@Tuplizers`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Tuplizers.html[`@Tuplizers`] annotation is used to group multiple <<annotations-hibernate-tuplizer>> annotations.

[[annotations-hibernate-type]]
==== `@Type`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Type.html[`@Type`] annotation is used to specify the Hibernate https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/type/Type.html[`@Type`] used by the current annotated basic attribute.

See the <<chapters/domain/basic_types.adoc#collections-comma-delimited-collection-example, `@Type` mapping>> section for more info.

[[annotations-hibernate-typedef]]
==== `@TypeDef`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/TypeDef.html[`@TypeDef`] annotation is used to specify a https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/type/Type.html[`@Type`] definition which can later be reused for multiple basic attribute mappings.

[[annotations-hibernate-typedefs]]
==== `@TypeDefs`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/TypeDefs.html[`@TypeDefs`] annotation is used to group multiple <<annotations-hibernate-typedef>> annotations.

[[annotations-hibernate-updatetimestamp]]
==== `@UpdateTimestamp`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/UpdateTimestamp.html[`@UpdateTimestamp`] annotation is used to specify that the current annotated timestamp attribute should be updated with the current JVM timestamp whenever the owning entity gets modified.

- `java.util.Date`
- `java.util.Calendar`
- `java.sql.Date`
- `java.sql.Time`
- `java.sql.Timestamp`

[[annotations-hibernate-valuegenerationtype]]
==== `@ValueGenerationType`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/ValueGenerationType.html[`@ValueGenerationType`] annotation is used to specify that the current annotation type should be used as a generator annotation type.

See the <<chapters/domain/basic_types.adoc#mapping-database-generated-value-example,`@ValueGenerationType` mapping>> section for more info.

[[annotations-hibernate-where]]
==== `@Where`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/Where.html[`@Where`] annotation is used to specify a custom SQL `WHERE` clause used when fetching an entity or a collection.

See the <<chapters/domain/basic_types.adoc#mapping-where-example,`@Where` mapping>> section for more info.

[[annotations-hibernate-wherejointable]]
==== `@WhereJoinTable`

The https://docs.jboss.org/hibernate/orm/{majorMinorVersion}/javadocs/org/hibernate/annotations/WhereJoinTable.html[`@WhereJoinTable`] annotation is used to specify a custom SQL `WHERE` clause used when fetching a join collection table.
