@Target(value={METHOD,FIELD}) @Retention(value=RUNTIME) public @interface ManyToMany
 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.  If the relationship is
 bidirectional, the non-owning side must use the mappedBy element of
 the ManyToMany annotation to specify the relationship field or
 property of the owning side.
 
The join table for the relationship, if not defaulted, is specified on the owning side.
 The ManyToMany annotation may be used within an
 embeddable class contained within an entity class to specify a
 relationship to a collection of entities. If the relationship is
 bidirectional and the entity containing the embeddable class is the
 owner of the relationship, the non-owning side must use the
 mappedBy element of the ManyToMany
 annotation to specify the relationship field or property of the
 embeddable class. The dot (".") notation syntax must be used in the
 mappedBy element to indicate the relationship
 attribute within the embedded attribute.  The value of each
 identifier used with the dot notation is the name of the respective
 embedded field or property.
 
    Example 1:
    // In Customer class:
    @ManyToMany
    @JoinTable(name="CUST_PHONES")
    public Set<PhoneNumber> getPhones() { return phones; }
    // In PhoneNumber class:
    @ManyToMany(mappedBy="phones")
    public Set<Customer> getCustomers() { return customers; }
    Example 2:
    // In Customer class:
    @ManyToMany(targetEntity=com.acme.PhoneNumber.class)
    public Set getPhones() { return phones; }
    // In PhoneNumber class:
    @ManyToMany(targetEntity=com.acme.Customer.class, mappedBy="phones")
    public Set getCustomers() { return customers; }
    Example 3:
    // In Customer class:
    @ManyToMany
    @JoinTable(name="CUST_PHONE",
        joinColumns=
            @JoinColumn(name="CUST_ID", referencedColumnName="ID"),
        inverseJoinColumns=
            @JoinColumn(name="PHONE_ID", referencedColumnName="ID")
        )
    public Set<PhoneNumber> getPhones() { return phones; }
    // In PhoneNumberClass:
    @ManyToMany(mappedBy="phones")
    public Set<Customer> getCustomers() { return customers; }
 JoinTable| Modifier and Type | Optional Element and Description | 
|---|---|
| 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 | mappedByThe field that owns the relationship. | 
| Class | targetEntity(Optional) The entity class that is the target of the
 association. | 
public abstract Class targetEntity
Defaults to the parameterized type of the collection when defined using generics.
public abstract CascadeType[] cascade
 When the target collection is a java.util.Map, the cascade element applies to the
 map value.
 
Defaults to no operations being cascaded.
public abstract FetchType fetch
public abstract String mappedBy
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