Hibernate joined table inheritance im combination with OneToOne and @MapsId

Question

Using Hibernate in combination with mysql.

When I try to create a @OneToOne Relationship from a child of a joined table inheritance while also using @MapsId to map the Id of the joined table child.

For testing it, I have even created a test project with the following structure:

Joined Table Parent

@Entity
@Table(name = "test_joined_bases")
@Getter
@Setter
@NoArgsConstructor
@Inheritance(strategy = InheritanceType.JOINED)
public class AJoinedBase implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
}

Joined Table Child

@Entity
@Table(name = "test_joined_children")
@Getter
@Setter
@NoArgsConstructor
@PrimaryKeyJoinColumn(name = "id")
public class JoinedChild extends AJoinedBase {
    @OneToOne(mappedBy = "note", fetch = FetchType.LAZY, cascade = CascadeType.ALL, optional = false)
    private NoteContent content;
}

OneToOne-Extension

@Entity
@Table(name = "test_joined_child_extensions")
@Getter
@Setter
@NoArgsConstructor
public class JoinedChildExtension implements Serializable {
    @Id
    private Long id;

    @OneToOne(fetch = FetchType.LAZY)
    @MapsId
    private JoinedChild joinedChild;
}

However, I cannot even start the spring boot application without it throwing an error. The problem seems to be that Hibernate cannot find the key-columns of the referenced Entity (here: JoinedChild) and thus throws a NullPointerException when calling columnIterator.next();. I believe that this happens because the key is saved in a wrappedValue due to the Joined Table Inheritance.
Can anyone help me with that or is this an issue with the Hibernate ORM?

StackTrace

When building the project, I get the following error:

2018-08-10 18:54:20.611  WARN 9836 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is java.util.NoSuchElementException
[...]
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is java.util.NoSuchElementException
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1706) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:579) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:501) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1089) ~[spring-context-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:859) ~[spring-context-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.2.RELEASE.jar:2.0.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-2.0.2.RELEASE.jar:2.0.2.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395) [spring-boot-2.0.2.RELEASE.jar:2.0.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.2.RELEASE.jar:2.0.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) [spring-boot-2.0.2.RELEASE.jar:2.0.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) [spring-boot-2.0.2.RELEASE.jar:2.0.2.RELEASE]
    at com.studynote.StudynoteBackendApplication.main(StudynoteBackendApplication.java:27) [classes/:na]
Caused by: java.util.NoSuchElementException: null
    at java.util.ArrayList$Itr.next(ArrayList.java:862) ~[na:1.8.0_171]
    at org.hibernate.cfg.annotations.TableBinder.linkJoinColumnWithValueOverridingNameIfImplicit(TableBinder.java:724) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.cfg.PkDrivenByDefaultMapsIdSecondPass.doSecondPass(PkDrivenByDefaultMapsIdSecondPass.java:37) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1640) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1597) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:278) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:861) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:888) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) ~[spring-orm-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390) ~[spring-orm-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) ~[spring-orm-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1765) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1702) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    ... 16 common frames omitted

Because I want the related Entity (JoinedChildExtension) to automatically get the id from the other side of the OneToOne (JoinedChild). — Leaze, Aug 11 '18 at 16:15

Vadym Ozarynskyi · Answer 1 · 2020-09-11T12:19:06.153

1

@MapId is designed for Embeddable id for more details you can read here I've fixed this for my problem replacing @MapId("nameOfColumn") with @JoinColumn("nameOfColumn")

edited Sep 11 '20 at 12:19

answered Jun 26 '19 at 10:50

Vadym Ozarynskyi

177
9

Khoa Le · Answer 2 · 2021-08-07T19:05:53.257

@MapsId is perfectly fine for using with @OneToOne relationship. See these articles for usage:

One-to-One Relationship in JPA.

The best way to map a @OneToOne relationship with JPA and Hibernate.

However, the NoSuchElementException is in the stacktrace probably because using @Inheritance(strategy = InheritanceType.JOINED) with @MapsId together. The problem is described in these Hibernate issue tickets: HHH-13335, HHH-13295, and HHH-7135.

Currently, all three tickets are unresolved. We have to wait for this bug to be fixed. In the mean time, you can use InheritanceType.SINGLE_TABLE or InheritanceType.TABLE_PER_CLASS with @MapsId as a workaround. See this article for the usage of these InheritanceType alternatives.

Hibernate joined table inheritance im combination with OneToOne and @MapsId

Joined Table Parent

Joined Table Child

OneToOne-Extension

StackTrace

2 Answers2