Question

我无法使用Hibernate OGM和mongoDB初始化EntityManagerFactory，但出现以下异常：

    Exception in thread "main" java.lang.ExceptionInInitializerError
    at model.DBManager.initEntityManagerFactory(DBManager.kt:11)
    at controller.restapi.RestapiApplicationKt.main(RestapiApplication.kt:13)
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: myPersistenceConfig] Unable to build Hibernate SessionFactory
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:970)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:895)
    at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:58)
    at org.hibernate.ogm.jpa.HibernateOgmPersistence.createEntityManagerFactory(HibernateOgmPersistence.java:57)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39)
    at model.util.HibernateOGMUtil.<clinit>(HibernateOGMUtil.kt:15)
    ... 2 more
Caused by: org.hibernate.MappingException: Could not determine type for: applicationdatamodel.sleep.SleepLevels, at table: Sleep, for columns: [org.hibernate.mapping.Column(levels)]
    at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:456)
    at org.hibernate.mapping.Property.getType(Property.java:69)
    at org.hibernate.jpa.event.spi.JpaIntegrator.integrate(JpaIntegrator.java:150)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:281)
    at org.hibernate.ogm.boot.impl.OgmSessionFactoryBuilderImpl.build(OgmSessionFactoryBuilderImpl.java:55)
    at org.hibernate.ogm.boot.impl.OgmSessionFactoryBuilderImpl.build(OgmSessionFactoryBuilderImpl.java:23)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:892)

这是与异常有关的代码：

class HibernateOGMUtil {

    companion object {

        private lateinit var entityManagerFactory: EntityManagerFactory

        init {
            try{
                entityManagerFactory = Persistence.createEntityManagerFactory("myPersistenceConfig")

            }catch (e:Exception){
                println(System.err.println("Initial EntityManagerFactory creation failed." + e))
            }
        }
        fun getEntityManagerFactory(): EntityManagerFactory{
            return entityManagerFactory
        }
    }
}

另一方面，我尝试从下一个实体中删除属性“级别”，然后，没有异常，并且持久性起作用。因此，我认为此属性正在发生错误。也许我应该添加一个特殊的注释，但是我真的对此感到困惑。

这是我的代码：

import applicationdatamodel.sleep.SleepLevels
import org.hibernate.annotations.Type
import java.util.*
import javax.persistence.*

@Entity
data class Sleep (
    @Temporal(TemporalType.TIMESTAMP) val dateOfSleep: Date,
    val user_cif: String,
    val duration: Int,
    @Temporal(TemporalType.TIMESTAMP) val startTime: Date,
    @Temporal(TemporalType.TIMESTAMP) val endTime: Date,
    val minutesAsleep: Int,
    val minutesAwake: Int,
    val levels: SleepLevels
){
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Type(type = "objectid")
    private lateinit var id: String
}

我将不胜感激。

Answer 1

引起问题的列为：val levels: SleepLevels。

Hibernate不知道如何在数据库上映射此类（我假设它不是枚举）。这意味着您需要将其映射为：

Embedded，使用@Embeddaded和@Embeddable批注；
Association，使用@OneToOne或@ManyToOne注释。

不知道您的模型的详细信息，我不能为您提供更多帮助，但是您应该能够在官方的休眠文档中找到所需的所有详细信息。

在实体声明时使用Hibernate OGM和MongoDB的异常

1 个答案: