java - 线程中的异常 "main"org.hibernate.TransactionException : nested transactions not supported

Question

这是我的模型类。这里我们使用 setter 和 getters 方法来初始化变量:

package org.koushik.javabrains.dto;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class UserDetails {
    @Id 
    private int userId;
    private String userName;
    public int getUserId() {
         return userId;
    }
    public void setUserId(int userId) {
         this.userId = userId;
    }
    public String getUserName() {
            return userName;
    }
    public void setUserName(String userName) {
            this.userName = userName;
    }    
}

这是我的模型对象，并将值分配给模型类中创建的变量:

package org.koushik.hibernate;

import org.hibernate.cfg.Configuration;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
//import org.hibernate.Transaction;
import org.koushik.javabrains.dto.UserDetails;

public class HibernateTest {
    public static void main(String arg[])
    {
        UserDetails user = new UserDetails();
        user.setUserId(1);
        user.setUserName("First User");

        SessionFactory sessionFactory = new Configuration().configure()
                                        .buildSessionFactory();
        Session session = sessionFactory.openSession();

        session.beginTransaction();
        session.save(user);
        session.beginTransaction().commit();
    }
}

Answer 1

替换

session.beginTransaction().commit(); 

与

session.getTransaction().commit();

注意使用 Spring 的 @Transactional将消除您自己管理交易的需要