Hibernate - OGM [PersistenceUnit: person] Unable to build Hibernate SessionFactory

Question

i am getting an below error

Exception in thread "main" javax.persistence.PersistenceException: [PersistenceUnit: person] Unable to build Hibernate SessionFactory at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:1249) at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.access$600(EntityManagerFactoryBuilderImpl.java:120) at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:860) at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850) at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:425) at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:849) at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:75) at org.hibernate.ogm.jpa.HibernateOgmPersistence.createEntityManagerFactory(HibernateOgmPersistence.java:63) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39) at com.ihappyk.utility.Utility.setUpEntityManagerFactory(Utility.java:11) at com.ihappyk.work.PersonWorker.main(PersonWorker.java:14) Caused by: org.hibernate.MappingException: Could not instantiate id generator [entity-name=com.ihappyk.model.Person] at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:123) at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:225) at org.hibernate.internal.SessionFactoryImpl.(SessionFactoryImpl.java:323) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1859) at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:857) ... 9 more Caused by: org.hibernate.HibernateException: Unanticipated return type [java.lang.Long] for UUID conversion at org.hibernate.id.UUIDGenerator.configure(UUIDGenerator.java:111) at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:117) ... 13 more

Utilty.java

public class Utility {
    private static EntityManagerFactory entityManagerFactory;

    //@BeforeClass
    public static EntityManagerFactory setUpEntityManagerFactory() {
        entityManagerFactory = Persistence.createEntityManagerFactory( "person" );
        return entityManagerFactory;
    }

    //@AfterClass
    public static void closeEntityManagerFactory() {
        entityManagerFactory.close();
    }
}

Persistant Class

@Entity
public class Person {

        @Id
        @GeneratedValue(generator = "uuid")
        @GenericGenerator(name = "uuid", strategy = "uuid2")
        private long id;

        private String firstName;
        private String lastName;

        public long getId() {
            return id;
        }
        public void setId(long id) {
            this.id = id;
        }
        public String getFirstName() {
            return firstName;
        }
        public void setFirstName(String firstName) {
            this.firstName = firstName;
        }
        public String getLastName() {
            return lastName;
        }
        public void setLastName(String lastName) {
            this.lastName = lastName;
        }

        public Person(){

        }

        public Person(String firstName, String lastName) {
            this.firstName = firstName;
            this.lastName = lastName;
        }    
}

main class

public class PersonWorker {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        EntityManagerFactory emf = Utility.setUpEntityManagerFactory();

        EntityManager em = emf.createEntityManager();

        em.getTransaction().begin();

            // create a Person
        Person bob = new Person( "Bob", "McRobb" );

        em.persist( bob );
        em.getTransaction().commit();
        em.close();
        emf.close();

    }

}

persistance.xml

<?xml version="1.0"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
             version="2.0">

    <persistence-unit name="person" transaction-type="JTA">
        <provider>org.hibernate.ogm.jpa.HibernateOgmPersistence</provider>
       <class>com.ihappyk.model.Person</class>
        <properties>
            <property name="hibernate.ogm.datastore.provider" value="mongodb" />
            <property name="hibernate.ogm.datastore.database" value="hibernateOGM" />
            <property name="hibernate.ogm.datastore.host" value="127.0.0.1" />
            <property name="hibernate.ogm.datastore.port" value="27017" />
            <property name="hibernate.ogm.datastore.provider" value="org.hibernate.ogm.datastore.mongodb.impl.MongoDBDatastoreProvider"/>

            <property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.JBossStandAloneJtaPlatform"/>
        </properties>
    </persistence-unit>
</persistence>

Answer 1

The root exception says it all:

Caused by: org.hibernate.HibernateException: Unanticipated return type [java.lang.Long] for UUID

You are using a UUID id generator on a type which it does not support. You should use String instead of Long in this case.