JPAの「Repeated column in mapping for entity」エラー

Caused by: org.hibernate.MappingException: Repeated column in mapping for entity: jp.co.XXX.entity.Case column: contact__herokurecordid__c (should be mapped with insert="false" update="false")

とのエラーになったら以下のように@JoinColumnにinsertable = false, updatable = falseを書く

    @Column(name = "contact__herokurecordid__c", length = 255)
    private String contactHerokuRecordId;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "contact__herokurecordid__c", referencedColumnName = "herokurecordid__c", insertable = false, updatable = false)
    @Setter(AccessLevel.NONE)
    private Contact contact;

    public String getContactLastName() {
        if (contact != null) {
            return contact.getLastName();
        }
        return null;
    }