@Entity
@Table(name = "map_entity")
public static class MapEntity {
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Integer id;
	
	@OneToMany(mappedBy = "mapEntity", cascade = CascadeType.ALL)
	@MapKey(name = "implicitType")
	private Map<ColorType, MapValue> implicitType = new HashMap<ColorType, MapValue>();
	@OneToMany(mappedBy = "mapEntity", cascade = CascadeType.ALL)
	@MapKey(name = "explicitType")
	private Map<ColorType, MapValue> explicitType = new HashMap<ColorType, MapValue>();

	@OneToMany(mappedBy = "mapEntity", cascade = CascadeType.ALL)
	@MapKey(name = "enumDefault")
	private Map<EnumMapKey, MapValue> enumDefaultType = new HashMap<EnumMapKey, MapValue>();
	@OneToMany(mappedBy = "mapEntity", cascade = CascadeType.ALL)
	@MapKey(name = "enumExplicitOrdinal")
	private Map<EnumMapKey, MapValue> enumExplicitOrdinalType = new HashMap<EnumMapKey, MapValue>();
	@OneToMany(mappedBy = "mapEntity", cascade = CascadeType.ALL)
	@MapKey(name = "enumExplicitString")
	private Map<EnumMapKey, MapValue> enumExplicitStringType = new HashMap<EnumMapKey, MapValue>();

	@OneToMany(mappedBy = "mapEntity", cascade = CascadeType.ALL)
	@MapKey(name = "enumExplicit")
	private Map<EnumMapKey, MapValue> enumExplicitType = new HashMap<EnumMapKey, MapValue>();
	@OneToMany(mappedBy = "mapEntity", cascade = CascadeType.ALL)
	@MapKey(name = "enumImplicit")
	private Map<ImplicitEnumMapKey, MapValue> enumImplicitType = new HashMap<ImplicitEnumMapKey, MapValue>();
	@OneToMany(mappedBy = "mapEntity", cascade = CascadeType.ALL)
	@MapKey(name = "enumImplicitOverrideOrdinal")
	private Map<ImplicitEnumMapKey, MapValue> enumImplicitOverrideOrdinalType = new HashMap<ImplicitEnumMapKey, MapValue>();
	@OneToMany(mappedBy = "mapEntity", cascade = CascadeType.ALL)
	@MapKey(name = "enumImplicitOverrideString")
	private Map<ImplicitEnumMapKey, MapValue> enumImplicitOverrideStringType = new HashMap<ImplicitEnumMapKey, MapValue>();

	@OneToMany(mappedBy = "mapEntity", cascade = CascadeType.ALL)
	@MapKey(name = "enumImplicitOverrided")
	private Map<ImplicitEnumMapKey, MapValue> enumImplicitOverridedType = new HashMap<ImplicitEnumMapKey, MapValue>();
}

@Column
private String foo = "bar";