Exception using Hibernate OGM and MongoDB at Entity declaration

Question

I´m not able to initialize my EntityManagerFactory using Hibernate OGM and mongoDB, I´m getting the following Exception:

    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)

This is the code involved with the Exception:

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
        }
    }
}

On the other hand, I have tried to remove the attribute 'levels' from next Entity and then, there is no exception and persistence works. So I suppose that something wrong is happening with this attribute. Maybe I should add a special annotation but I´m really stuck on this.

Here is my code:

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
}

I would apreciate any help.

Doesn't look like the exception has anything to do with the code you posted? Why don't you post the code where the exception actually happens? — Strelok, Aug 23 '18 at 06:24
@Strelok I have edited it. You are right! Hope now it´s better. Thank you. — Ángel Rodríguez, Aug 23 '18 at 09:41
Would you be able to create a small project as an example an publish it somewhere so that we can re-create the error? — Davide D'Alto, Aug 23 '18 at 10:00
You’re not seeing the full exception. Remove your try catch clause so you can get the full stack trace of the hibernate exception. — Strelok, Aug 23 '18 at 14:54
@Strelok I took your advice. Full stack trace is now updated in my post. My problem should be this: org.hibernate.MappingException: Could not determine type for: applicationdatamodel.sleep.SleepLevels, at table: Sleep, for columns: [org.hibernate.mapping.Column(levels)]. What should I do to solve it? — Ángel Rodríguez, Aug 24 '18 at 07:05
I solved the problem! I had to add 'Embedded' annotation to 'levels' attribute. Then I added 'Embeddable' annotation to its class. Finally I used this for the rest of embedded classes that represent a embedded object in the mongoDB document. Finally, I had to add 'ElementCollection' annotation to a List of another class that I implemented. — Ángel Rodríguez, Aug 25 '18 at 10:23
I wrote the answer without noticing your last comment, I guess it will be useful for other people having similar issues. — Davide D'Alto, Aug 29 '18 at 08:48

Davide D'Alto · Accepted Answer · 2018-09-13T12:45:21.850

The column causing the issue is: val levels: SleepLevels.

Hibernate doesn't know how to map this class on the database (I assume it's not an enum). This means that you need to map it as:

Embedded, using the @Embeddaded and @Embeddable annotations;
Association, using the @OneToOne or @ManyToOne annotations.

Not knowing the details of your model I cannot help you more than this but you should be able to find all the details you need in the official hibernate documentation.

Exception using Hibernate OGM and MongoDB at Entity declaration

1 Answers1