Hibernate twice embedded entities

Question

I have Hibernate 5.2.10 version and hibernate-jpa-2.1-api with version 1.0.0.Final. I am using MairaDB as database. In persistance.xml, set the property hibernate.ejb.naming_strategy as DefaultComponentSafeNamingStrategy but still I receive the same error: Repeated column in mapping for entity. I do not want to use @attributeoverrides hibernate and I tried different methodes but still the same error. I want two or more embedded enities.

Thanks

v.ladynev · Accepted Answer · 2017-05-15 14:13:37Z

1

You can't use DefaultComponentSafeNamingStrategy with Hibernate 5, because of it is an implementation of the old NamingStrategy interface from Hibernate 4.

As you probably know, Hibernate 5 uses two new interfaces ImplicitNamingStrategy and PhysicalNamingStrategy.

You can use this implicit naming strategy: org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl. You will need to set hibernate.implicit_naming_strategy property (not hibernate.ejb.naming_strategy).

For these entities

@Embeddable
public class AuthorInfo {

    @Column
    private String authorInfo;

    @OneToOne
    private Book bestBook;

}

@Entity
public class Book {

    @Id
    private Long pid;

    @Embedded
    private AuthorInfo firstAuthor;

    @Embedded
    private AuthorInfo secondAuthor;

}

it creates this schema

create table Book (
        pid bigint not null,
        firstAuthor_authorInfo varchar(255),
        secondAuthor_authorInfo varchar(255),
        firstAuthor_bestBook_pid bigint,
        secondAuthor_bestBook_pid bigint,
        primary key (pid)
)

Unit test to check a schema: TwoEmbeddedStrategyTest.java

edited May 15, 2017 at 14:13

answered May 15, 2017 at 14:00

v.ladynev

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5 Comments

Elhamo Over a year ago

I used annotation @column and used this org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl and did not work but after removing annotations it worked.

v.ladynev Over a year ago

@Elhamo I have checked this with Hibernate SessionFactory, not with PersistentContext. It can be a reason, but I am not sure. You could just miss something.

mbmast Over a year ago

@v.ladynev My experience is that if you use the org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl strategy then @Column is ignored (specifically the name value). Is there a way to use this strategy while preserving the use of @Column? This problem might be what @Elhamo was describing.

v.ladynev Over a year ago

@mbmast @Column is ignored with PhysicalNamingStrategy. It shouldn't be ignored with ImplicitNamingStrategy, as I can remember.

mjs Over a year ago

PhysicalNamingStrategy only contains information on the column. How am I to detect if the naming applies to a certain field of a certain class or embeddable type. Containz zero useful information. Just column name through identifier.getText().

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