错误：找不到 hibernate.properties

Question

我收到一个错误。如果你能帮助我，我会很高兴的。我在学习hibernate时收到以下错误消息。我也使用 PostgreSQL 数据库。我是通过关注that video 做到的。

错误信息：

Exception in thread "main" org.hibernate.internal.util.config.ConfigurationException: Unable to perform unmarshalling at line number 0 and column 0 in RESOURCE hibernate.cfg.xml. Message: null

HibernateTest.java（主类）

package hibernate1;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateTest {

    public static void main(String[] args) {

        UserDetails user = new UserDetails();
        user.setUserId(1);
        user.setUserName("oguzhancevik");

        SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.save(user);
        session.getTransaction().commit();

    }

}

UserDetails.Java

hibernate.cfg.xml

Answer 1

由于是Main.java，需要实例化配置。

Configuration conf = new Configuration(); conf.configure("hibernate.cfg.xml"); 

并从 conf 对象开始会话

Answer 2

我找到了解决方案（正确答案）。

来源https://github.com/oguzhancevik/Hibernate

休眠配置文件

hibernate.cfg.xml

<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<session-factory>

    <!-- JDBC Database connection settings -->
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="connection.url">jdbc:mysql://localhost:3306/hb_student_tracker?useSSL=false</property>
    <property name="connection.username">root</property>
    <property name="connection.password"></property>

    <!-- JDBC connection pool settings ... using built-in test pool -->
    <property name="connection.pool_size">1</property>

    <!-- Select our SQL dialect -->
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

    <!-- Echo the SQL to stdout -->
    <property name="show_sql">true</property>

    <!-- Set the current session context -->
    <property name="current_session_context_class">thread</property>

</session-factory>

实体类

学生.java

package com.oguzhancevik.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "student")
public class Student {

    @Id
    @Column(name = "id")
    private int id;

    @Column(name = "first_name")
    private String firstName;

    @Column(name = "last_name")
    private String lastName;

    @Column(name = "email")
    private String email;

    public Student(String firstName, String lastName, String email) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }

    public int getId() {
        return id;
    }

    public void setId(int 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 String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Student [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", email=" + email + "]";
    }

}

主类

CreateStudentDemo.java

package com.oguzhancevik.demo;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

import com.oguzhancevik.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 {

            // use the session object to save Java object
            System.out.println("Creating new Student object...");
            Student student = new Student("Oguzhan", "Cevik", "cevik.ogsan@gmail.com");

            // start a transaction
            session.beginTransaction();

            // save the student object
            System.out.println("Saving the student...");
            session.save(student);

            // commit transaction
            session.getTransaction().commit();

            System.out.println("Done!");

        } finally {
            session.close();
            factory.close();
        }

    }

}