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## org.hibernate.annotations
Annotation Type MapKey

Deprecated. Use `MapKeyColumn` This is the default behavior for Map properties marked as @OneToMany, @ManyToMany or @ElementCollection

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

Define the map key columns as an explicit column holding the map key This is completely different from `MapKey` which use an existing column This annotation and `MapKey` are mutually exclusive

Author:
  Emmanuel Bernard

Optional Element Summary
`Column[]` | `columns` Deprecated.
`Class` | `targetElement` Deprecated. Represent the key class in a Map Only useful if the collection does not use generics
`Type` | `type` Deprecated. The optional map key type.

### columns

    public abstract Column[] columns

  Deprecated.
  Default:
    {}

### targetElement

    public abstract Class targetElement

  Deprecated.
  Represent the key class in a Map Only useful if the collection does not use generics

  Default:
    void.class

### type

    public abstract Type type

  Deprecated.
  The optional map key type. Guessed if default

  Default:
    @org.hibernate.annotations.Type(type="")

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