Running a Hibernate based Application

package dev.regatta.hibernate_example;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.query.Query;
import org.hibernate.cfg.Configuration;
import javax.persistence.*;
import java.util.List;
@Entity
@Table(name = "employees")
public class Employee {
 @Id @Column(name = "employee_key") private int id;
 @Column(name = "employee_name", nullable = false, length = 40)
 private String name;
 @Column(name = "employee_salary") private int salary;
 @Column(name = "employee_department", nullable = false, length = 50)
 private String department;
 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; }
 public int getSalary() { return salary; }
 public void setSalary(int salary) { this.salary = salary; }
 public String getDepartment() { return department; }
 public void setDepartment(String department) {
 this.department = department;
 }
}
public class HibernateExample {
 public static void main(String[] args) {
 // Configure Hibernate
 Session session = new Configuration()
 .configure("hibernate.cfg.xml")
 .addAnnotatedClass(Employee.class)
 .buildSessionFactory()
 .openSession();
 Transaction transaction = null;
 try {
 // Start a transaction
 transaction = session.beginTransaction();
 // Create a list of employees
 List<Employee> employees_inserted =
 Arrays.asList(new Employee(1, "John Doe", 10932, "DevOps"),
 new Employee(2, "Richard Roe", 18324, "Legal"),
 new Employee(3, "Jane Roe", 20411, "SoftwareDev"),
 new Employee(4, "Rachel Roe", 19555, "Support"));
 // Persist each employee from the list
 for (Employee employee : employees_inserted) {
 session.persist(employee);
 }
 // Commit the transaction
 transaction.commit();
 // Fetch and display employees
 List<Employee> employees_selected =
 session.createQuery("from Employee", Employee.class).list();
 for (Employee emp : employees_selected) {
 System.out.println("Employee Key: " + emp.getId());
 System.out.println("Employee Name: " + emp.getName());
 System.out.println("Employee Salary: " + emp.getSalary());
 System.out.println("Employee Department: " + emp.getDepartment());
 System.out.println();
 }
 // Delete employees
 transaction = session.beginTransaction();
 for (Employee emp : employees_inserted) {
 m_session.remove(emp);
 }
 transaction.commit();
 } catch (Exception e) {
 if (transaction != null) {
 transaction.rollback();
 }
 e.printStackTrace();
 } finally {
 session.close();
 }
 }
}