package com.vaannila.course;
public class Course {

   private int courseId;
   private String courseName;
   
   public Course(){
      
   }
   
   public Course(String courseName){
      this.courseName = courseName;
   }
   
   public int getCourseId(){
      return this.courseId;
   }
   
   public void setCourseId(int courseId) {
      this.courseId = courseId;
   }
   
   public String getCourseName() {
      return this.courseName;
   }
   
   public void setCourseName(String courseName) {
      this.courseName = courseName;
   }   
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
   <session-factory>
      <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
      <property name="connection.url">jdbc:mysql://localhost:3306/tutorial</property>
      <property name="connection.username">root</property>
      <property name="connection.password">password</property>
      <property name="connection.pool_size">1</property>
      <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
      <property name="show_sql">true</property>
      <property name="hbm2ddl.auto">create</property>
      <mapping resource="com/vaannila/course/Course.hbm.xml"/>
   </session-factory>
</hibernate-configuration>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
   <class name="com.vaannila.course.Course" table="COURSES">
        <id name="courseId" type="integer" column="COURSE_ID"></id>
      <property name="courseName" type="string" column="COURSE_NAME" />
   </class>
</hibernate-mapping>

package com.vaannila.util;

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

public class HibernateUtil {
   private static final SessionFactory sessionFactory;
   static {
      try {
         sessionFactory = new Configuration().configure().buildSessionFactory();
      }catch (Throwable ex) {
         System.err.println("Initial SessionFactory creation failed." + ex);
         throw new ExceptionInInitializerError(ex);
      }
   }
   
   public static SessionFactory getSessionFactory() {
      return sessionFactory;
   }
}

package com.vaannila.course;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.vaannila.util.HibernateUtil;

public class Main {
   public static void main(String[] args) {
      Main obj = new Main();
      obj.saveCourse("Physics");
      obj.saveCourse("Chemistry");
      obj.saveCourse("Maths");
   }
   
   public void saveCourse(String courseName){
      Session session = HibernateUtil.getSessionFactory().openSession();
      Transaction transaction = null;
      try {
         System.out.println("Checkpoint1");
         transaction = session.beginTransaction();
         System.out.println("Checkpoint2");
         Course course = new Course();
         course.setCourseName(courseName);
         System.out.println("Checkpoint3");
         transaction.commit();
         System.out.println("Checkpoint4");
      }catch (HibernateException e) {
         System.out.println("Checkpoint5");
         transaction.rollback();
         System.out.println("Checkpoint6");
         e.printStackTrace();
      }finally {
         session.close();
      }
   }
}

...
         course.setCourseName(courseName);
         System.out.println("Checkpoint3");
         session.save(course);
         transaction.commit();
         System.out.println("Checkpoint4");
         ...