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I have an entity with composite key so I use the @Embeddable and @EmbeddedId annotations. Embeddable class looks like this : @Embeddable public class DitaAdminAccountSkillPK implements Serializable { @ManyToOne @JoinColumn(name = "admin_id") private DitaAdmin admin; @ManyToOne @JoinColumn(name = "account_id") private DitaAccount account; //constructor, getters, setters... } And the entity that uses it : @Entity public class DitaAdminAccountSkill { @EmbeddedId private DitaAdminAccountSkillPK id; //constructor, getters, setters... } Now I want to map the entity in another entity like this : @OneToMany(fetch = FetchType.LAZY, mappedBy = "id.admin") private List<DitaAdminAccountSkill> accountSkills; Notice the mappedBy = "id.admin" which refers to admin field in DitaAdminAccountSkillPK using the id field of DitaAdminAccountSkill . This compiles and runs just fine. However, in eclipse there is an error displayed that says : In attribute 'accountSkills', the "mapped by" value 'id.admin' cannot be resolved to an attribute on the target entity. Note that this is a JPA Problem meaning the JPA facet is complaining. Now, I know I could use @IdClass instead but I am just wondering why does it think its an error. Or maybe I do something terribly wrong ?

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