Hibernate Many To Many Mapping Relations using Annotation

Create Java Project:

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>HibernateManyToMany</groupId>
<artifactId>HibernateManyToMany</artifactId>
<version>0.0.1-SNAPSHOT</version>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.2.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
</dependencies>
</project>

hibernate.cfg.xml

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE hibernate-configuration PUBLIC

"-//Hibernate/Hibernate Configuration DTD 3.0//EN"

"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

<session-factory>

    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>

    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hohisa</property>

    <property name="hibernate.connection.username">root</property>

    <property name="hibernate.connection.password">root</property>

    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

    <property name="hibernate.show_sql">true</property>

    <property name="hbm2ddl.auto">update</property>

    <mapping class="com.hohisa.Student"/>

    <mapping class="com.hohisa.Course"/>

</session-factory>

</hibernate-configuration>

Student.java

package com.hohisa;
import java.util.Set;
import javax.persistence.*;
@Entity
@Table(name = "student")
public class Student {
@Id
@GeneratedValue
@Column(name = "studentId")
private int studentId;
@Column(name = "studentName")
private String studentName;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name = "student_course", joinColumns = { @JoinColumn(name = "studentId") }, inverseJoinColumns = { @JoinColumn(name = "courseId") })
private Set<Course> courses;
public int getStudentId() {
return studentId;
}
public void setStudentId(int studentId) {
this.studentId = studentId;
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
}
public Set<Course> getCourses() {
return courses;
}
public void setCourses(Set<Course> courses) {
this.courses = courses;
}
}

Course.java

package com.hohisa;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "course")
public class Course {
@Id
@GeneratedValue
@Column(name = "courseId")
private int courseId;
@Column(name = "courseName")
private String courseName;
public int getCourseId() {
return courseId;
}
public void setCourseId(int courseId) {
this.courseId = courseId;
}
public String getCourseName() {
return courseName;
}
public void setCourseName(String courseName) {
this.courseName = courseName;
}
}

Main.java

package com.hohisa;
import java.util.*;
import org.hibernate.*;
import org.hibernate.cfg.Configuration;
public class MainClass {
public static void main(String[] args) {
Configuration configuration = new Configuration();
configuration.configure("hibernate.cfg.xml");
SessionFactory sessionFactory = configuration.buildSessionFactory();
Session session = sessionFactory.openSession();
Transaction transaction =session.beginTransaction();
Course course1 =new Course();
course1.setCourseName("Computers");
Course course2 =new Course();
course2.setCourseName("Computers");
Set<Course> courses=new HashSet<Course>();
courses.add(course1);
courses.add(course2);
Student student1=new Student();
student1.setStudentName("Anil");
student1.setCourses(courses);
Student student2=new Student();
student2.setStudentName("davy");
student2.setCourses(courses);
session.persist(student1);
session.persist(student2);
transaction.commit();
session.close();
sessionFactory.close();
}
}

Console OutPut

Database Output