javax.persistence
Annotation Type ManyToMany

@Target(value={METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface ManyToMany

A ManyToMany annotation defines a many-valued association with many-to-many multiplicity. If the Collection is defined using generics to specify the element type, the associated target entity class does not need to be specified; otherwise it must be specified.
Every many-to-many association has two sides, the owning side and the non-owning, or inverse, side. The join table is specified on the owning side. If the association is bidirectional, either side may be designated as the owning side.

Since:

EJB 3.0 version.

Author:

Florent Benoit

See Also:

EJB 3.0 specification

Optional Element Summary

CascadeType[]	cascade (Optional) The operations that must be cascaded to the target of the association.
FetchType	fetch (Optional) Whether the association should be lazily loaded or must be eagerly fetched.
String	mappedBy The field that owns the relationship.
Class	targetEntity (Optional) The entity class that is the target of the association.

targetEntity

public abstract Class targetEntity

(Optional) The entity class that is the target of the association. Optional only if the collection property is defined using Java generics. Must be specified otherwise.

Default:

void.class

cascade

public abstract CascadeType[] cascade

(Optional) The operations that must be cascaded to the target of the association.

Default:

{}

fetch

public abstract FetchType fetch

(Optional) Whether the association should be lazily loaded or must be eagerly fetched. The EAGER strategy is a requirement on the persistence provider runtime that the associated entities must be eagerly fetched. The LAZY strategy is a hint to the persistence provider runtime.

Default:

javax.persistence.FetchType.LAZY

mappedBy

public abstract String mappedBy

The field that owns the relationship. Required unless the relationship is unidirectional.

Default:

""