我收到以下错误
线程“main”中出现异常 javax.persistence.PersistenceException: [PersistenceUnit: person] 无法构建 Hibernate SessionFactory
在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException（EntityManagerFactoryBuilderImpl.java:1249）
在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.access$600(EntityManagerFactoryBuilderImpl.java:120)
在 org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:860)
在 org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)
在 org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:425)
在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build（EntityManagerFactoryBuilderImpl.java:849）
在org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory（HibernatePersistenceProvider.java:75）
在org.hibernate.ogm.jpa.HibernateOgmPersistence.createEntityManagerFactory（HibernateOgmPersistence.java:63）
在javax.persistence.Persistence.createEntityManagerFactory（Persistence.java:55）
在javax.persistence.Persistence.createEntityManagerFactory（Persistence.java:39）
在 com.ihappyk.utility.Utility.setUpEntityManagerFactory(Utility.java:11)
在 com.ihappyk.work.PersonWorker.main(PersonWorker.java:14)
引起原因：org.hibernate.MappingException：无法实例化 id 生成器 [entity-name=com.ihappyk.model.Person]
在org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator（DefaultIdentifierGeneratorFactory.java:123）
在 org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:225)
在 org.hibernate.internal.SessionFactoryImpl.(SessionFactoryImpl.java:323)
在org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java：1859）
在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl $4.perform（EntityManagerFactoryBuilderImpl.java:857）
... 9 更多
引起原因：org.hibernate.HibernateException：UUID 转换出现意外的返回类型 [java.lang.Long]
在org.hibernate.id.UUIDGenerator.configure（UUIDGenerator.java:111）
在org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator（DefaultIdentifierGeneratorFactory.java:117）
... 13 更多
实用程序.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();
}
}
持久类
@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;
}
}
主班
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();
}
}
持久性.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>
根异常说明了一切：
Caused by: org.hibernate.HibernateException: Unanticipated return type [java.lang.Long] for UUID
您在不支持的类型上使用 UUID id 生成器。你应该使用String代替Long在这种情况下。
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