JPA mapping @ManyToOne between Embeddable and EmbeddedId

Question

I have the following setup in my Spring Boot JPA application:

Embeddable

@Embeddable
public class LogSearchHistoryAttrPK {
    @Column(name = "SEARCH_HISTORY_ID")
    private Integer searchHistoryId;

    @Column(name = "ATTR", length = 50)
    private String attr;

    @ManyToOne
    @JoinColumn(name = "ID")
    private LogSearchHistory logSearchHistory;
    ...
}

EmbeddedId

@Repository
@Transactional
@Entity
@Table(name = "LOG_SEARCH_HISTORY_ATTR")
public class LogSearchHistoryAttr implements Serializable {
    @EmbeddedId
    private LogSearchHistoryAttrPK primaryKey;

    @Column(name = "VALUE", length = 100)
    private String value;
    ...
}

OneToMany

@Repository
@Transactional
@Entity
@Table(name = "LOG_SEARCH_HISTORY")
public class LogSearchHistory implements Serializable {
    @Id
    @Column(name = "ID", unique = true, nullable = false)
    private Integer id;

    @OneToMany(mappedBy = "logSearchHistory", fetch = FetchType.EAGER)
    private List<LogSearchHistoryAttr> logSearchHistoryAttrs;
    ...
}

Database DDLs

CREATE TABLE log_search_history (
    id serial NOT NULL,
    ...
    CONSTRAINT log_search_history_pk PRIMARY KEY (id)
 );

CREATE TABLE log_search_history_attr (
    search_history_id INTEGER NOT NULL,
    attr CHARACTER VARYING(50) NOT NULL,
    value CHARACTER VARYING(100),
    CONSTRAINT log_search_history_attr_pk PRIMARY KEY (search_history_id, attr),
    CONSTRAINT log_search_history_attr_fk1 FOREIGN KEY (search_history_id) REFERENCES
        log_search_history (id)
);

When I go to start the application, I get the following error:

Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: com.foobar.entity.LogSearchHistoryAttr.logSearchHistory in com.foobar.entity.LogSearchHistory.logSearchHistoryAttrs

I am not sure why I am getting this error - the mapping looks correct (to me). What is wrong with this mapping that I have? Thanks!

Answer 1

You moved the mappedBy attribute into an embeddable primary key, so the field is no longer named logSearchHistory but rather primaryKey.logSearchHistory. Change your mapped by entry:

@OneToMany(mappedBy = "primaryKey.logSearchHistory", fetch = FetchType.EAGER)
private List<LogSearchHistoryAttr> logSearchHistoryAttrs;

Reference: JPA / Hibernate OneToMany Mapping, using a composite PrimaryKey.

You also need to make the primary key class LogSearchHistoryAttrPK serializable.

Answer 2

At OneToMany part:

@OneToMany(mappedBy = "primaryKey.logSearchHistory", fetch = FetchType.EAGER)
private List<LogSearchHistoryAttr> logSearchHistoryAttrs;