Hibernate Many To Many Annotation Tutorial

Add following dependency in pom.xml file.

<dependencies>

<dependency>
	<groupId>org.hibernate</groupId>
	<artifactId>hibernate-core</artifactId>
	<version>5.4.28.Final</version>
</dependency>

<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<version>5.1.6</version>
</dependency>

</dependencies>
  

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

<property name="hbm2ddl.auto">update</property>
<property name="show_sql">true</property>
		
	
</session-factory>
</hibernate-configuration>
   

Client.java

package com.deepsingh44.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Client {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;
	private String name;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

}
  

Product.java

package com.deepsingh44.model;

import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

@Entity
@Table(name = "pdt")
public class Product {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;
	private String name;
	@ManyToMany(cascade = CascadeType.ALL)
	@JoinTable(name = "third_table")
	private List<Client> clients;

	public List<Client> getClients() {
		return clients;
	}

	public void setClients(List<Client> clients) {
		this.clients = clients;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

}
  

Test.java

package com.deepsingh44.model;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

public class Test {
	public static void main(String[] args) {

		// Load your configuration file
	StandardServiceRegistry ssr = new StandardServiceRegistryBuilder().
			configure("hibernate.cfg.xml").
			build();
	Metadata meta = new MetadataSources(ssr).
			addAnnotatedClass(Client.class).
			addAnnotatedClass(Product.class).
			getMetadataBuilder().
			build();

		// Get sessionFactory object
	SessionFactory factory = meta.getSessionFactoryBuilder().
			build();

	// Get session object
	Session session = factory.openSession();

	Product p2 = new Product();
	p2.setName("Pen");

	Client c1 = new Client();
	c1.setName("Rohit");

	Client c2 = new Client();
	c2.setName("Syed");

	List<Client> clients = new ArrayList();
	clients.add(c1);
	clients.add(c2);

	p2.setClients(clients);

	Transaction txt = session.beginTransaction();

	session.save(p2);

	// Actual transaction here
	txt.commit();

	session.close();
	System.out.println("Successfully Inserted");

	}
}