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

This annotation must be specified for persistent map keys of type Date and Calendar. It may only be specified for map keys of these types.

The MapKeyTemporal annotation can be applied to an element collection or relationship of type java.util.Map in conjunction with the ElementCollection, OneToMany, or ManyToMany annotation.

     Example:
 
     @OneToMany
     @MapKeyTemporal(DATE)
     protected java.util.Map<java.util.Date, Employee> employees;