Java/Hibernate 错误：检测到连接泄漏。内部连接池已达到最大大小，当前没有可用连接

Question

我是 Java/Hibernate 的新手，我不知道这个错误意味着什么。ERROR: Connection leak detected: there are 1 unclosed connections upon shutting down pool jdbc:mysql://localhost:3306/hb_student_records?useSSL=false&serverTimezone=UTCException in thread "main" org.hibernate.HibernateException: The internal connection pool has reached its maximum size and no connection is currently available!我在 Stack Overflow 的其他论坛上查找了答案，但对我来说没有任何意义。我的课程如下：创建学生演示package com.rsharma.hibernate.demo;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;import com.rsharma.hibernate.demo.entity.Student;public class CreateStudentDemo {    public static void main(String[] args) {        // create session factory        SessionFactory factory = new Configuration()                                .configure("hibernate.cfg.xml")                                .addAnnotatedClass(Student.class)                                .buildSessionFactory();        // create session        Session session = factory.getCurrentSession();        try {                       // create a student object            System.out.println("Creating new student object...");            Student tempStudent = new Student("Rishav", "Sharma", "[e-mail]");            // start a transaction            session.beginTransaction();            // save the student object            System.out.println("Saving the student...");            session.save(tempStudent);            // commit transaction            session.getTransaction().commit();            System.out.println("Done!");        }        finally {            factory.close();        }    }}

Answer 1

我认为您还应该在关闭工厂对象之前刷新并关闭会话对象。

Answer 2

在您的实体类中使用以下 @GeneratedValue(strategy = GenerationType.IDENTITY)