iHappyk iHappyk - 2 months ago 45
Java Question

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

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

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.