[해결 방법] org.hibernate.MappingException

👉 기본 환경

- Language: Java

- DB: H2 Database

- IDE: IntelliJ

 

 

⌨️ 코드

@Entity
public class MemberUsingEm {
 
    @Id @GeneratedValue
    private long id;
 
    private String username;
 
    // Period
    @Embedded
    private Period workPeriod;
 
    // Address
    @Embedded
    private Address homeAddress;
    @Embedded
    private Address workAddress;
 
}
 

 

 

🖨️오류

WARN: HHH000457: Joined inheritance hierarchy [jpa_basic.Item] defined explicit @DiscriminatorColumn.  Legacy Hibernate behavior was to ignore the @DiscriminatorColumn.  However, as part of issue HHH-6911 we now apply the explicit @DiscriminatorColumn.  If you would prefer the legacy behavior, enable the `hibernate.discriminator.ignore_explicit_for_joined` setting (hibernate.discriminator.ignore_explicit_for_joined=true)
Exception in thread "main" javax.persistence.PersistenceException: [PersistenceUnit: hello] Unable to build Hibernate SessionFactory
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:1326)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1252)
    at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:56)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
    at jpa_basic.Main.main(Main.java:14)
Caused by: org.hibernate.MappingException: Repeated column in mapping for entity: jpa_basic.MemberUsingEm column: city (should be mapped with insert="false" update="false")
    at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:862)
    at org.hibernate.mapping.PersistentClass.checkPropertyColumnDuplication(PersistentClass.java:880)
    at org.hibernate.mapping.PersistentClass.checkPropertyColumnDuplication(PersistentClass.java:876)
    at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:902)
    at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:634)
    at org.hibernate.mapping.RootClass.validate(RootClass.java:267)
    at org.hibernate.boot.internal.MetadataImpl.validate(MetadataImpl.java:351)
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:464)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1249)
    ... 4 more
 

 

 

📡 원인

@Embedded 타입의 Address 객체가 homeAddress와 workAddress가 2개 존재

MemberUsingEm에서 이름이 같은 Address 컬럼들이 중복해서 생성

 

 

📰 해결 방법

@Entity
public class MemberUsingEm {
 
    @Id @GeneratedValue
    private long id;
 
    private String username;
 
    // Period
    @Embedded
    private Period workPeriod;
 
    // Address
    @Embedded
    private Address homeAddress;
    @Embedded
    @AttributeOverrides({
            @AttributeOverride(name="city",
                    column=@Column(name = "WORK_CITY")),
            @AttributeOverride(name="street",
                    column=@Column(name = "WORK_STREET")),
            @AttributeOverride(name="zipcode",
                    column=@Column(name = "WORK_ZIPCODE"))
    })
    private Address workAddress;
 
}
 

@AttributeOverrides 사용하여 중복되지 않는 새로운 컬럼 name 부여

 

 

🖨️ 실행 결과

Hibernate: 
    
    create table MemberUsingEm (
       id bigint not null,
        city varchar(255),
        street varchar(255),
        zipcode varchar(255),
        username varchar(255),
        WORK_CITY varchar(255),
        WORK_STREET varchar(255),
        WORK_ZIPCODE varchar(255),
        endDate timestamp,
        startDate timestamp,
        primary key (id)
    )