Я видел похожие сообщения, но у меня все еще есть проблемы. Я позаботился о javax.persistence.Entity
, а также о классе сопоставления в xml, но мне трудно понять этот. Помогите !!!org.hibernate.MappingException: Неизвестный объект: com.gontuseries.hibernate.Student_Info
Исключение в потоке "основного" org.hibernate.MappingException: Неизвестный объект: com.gontuseries.hibernate.Student_Info в org.hibernate.internal.SessionFactoryImpl.getEntityPersister (SessionFactoryImpl.java:776) в орг. hibernate.internal.SessionImpl.getEntityPersister (SessionImpl.java:1451) в org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId (AbstractSaveEventListener.java:100) ...
package com.gontuseries.hibernate;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
public class Main {
public static void main(String[] args) {
// Write the Student_Info object into the database
Student_Info student = new Student_Info();
student.setName("Gontu");
student.setRollNo(1);
SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openSession();
session.beginTransaction();
// this would save the Student_Info object into the database
session.save(student);
session.getTransaction().commit();
session.close();
sessionFactory.close();
}
}
package com.gontuseries.hibernate;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="STUDENT_INFORMATION")
public class Student_Info{
@Id
private int rollNo;
@Column
private String name;
public int getRollNo() {
return rollNo;
}
public void setRollNo(int rollNo) {
this.rollNo = rollNo;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
package com.gontuseries.hibernate;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static ServiceRegistry serviceRegistry;
private static SessionFactory buildSessionFactory() {
try {
Configuration configuration = new Configuration();
configuration.configure();
serviceRegistry = new StandardServiceRegistryBuilder().applySettings(
configuration.getProperties()).build();
return configuration.buildSessionFactory(serviceRegistry);
} catch (Throwable ex) {
System.err.println("Failed to create sessionFactory object." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/hibernateTutorials</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop the existing tables and create new one -->
<property name="hbm2ddl.auto">create</property>
<!-- Mention here all the model classes along with their package name -->
<mapping class="com.gontuseries.hibernate.Student_Info"/>
</session-factory>
</hibernate-configuration>
Я очистил свой вопрос на некоторые из них. Включение сообщений об ошибках в комментарии полезно. Для получения дополнительной информации об уценке вы можете обратиться к [редактированию справки] (http://stackoverflow.com/editing-help) – Machavity