Getting
org.hibernate.AnnotationException: Unknown mappedBy in: LocalizedString.values, referenced property unknown: LocalizedStringMap.localizedString.

LocalizedString -
@OneToOne(mappedBy = "localizedString")
@Cascade({ CascadeType.ALL, CascadeType.DELETE_ORPHAN})
private LocalizedStringMap values;

LocalizedStringMap -
@OneToOne
@JoinColumn(name="LocalizedString_id", nullable = false)
private LocalizedString localizedString;
& has corresponding getters & setters (public).

Please point out why I am getting the above mentioned error.
Thanks in advance.