public class MainClass {

public static void main(String args[]){

    try{
        Session session=HibernateUtil.getSession();
        Transaction tx=session.beginTransaction();
        Employee ee=new Employee("abx","asd",2000);
        session.save(ee);
        tx.commit();


    }catch(Exception e){
        e.printStackTrace();
    }
  }
}

package sally;

   public class Employee {
   private int id;
   private String firstName;
   private String lastName;
   private int salary;

  public Employee() {}
  public Employee(String fname, String lname, int salary) {
  this.firstName = fname;
  this.lastName = lname;
  this.salary = salary;
  }
   public int getId() {
   return id;
 }
  public void setId( int id ) {
   this.id = id;
 }
  public String getFirstName() {
  return firstName;
  }
      public void setFirstName( String first_name ) {
      this.firstName = first_name;
      }
      public String getLastName() {
      return lastName;
       }
      public void setLastName( String last_name ) {
      this.lastName = last_name;
      }
        public int getSalary() {
        return salary;
      }
        public void setSalary( int salary ) {
        this.salary = salary;
      }
}


  <?xml version="1.0" encoding="utf-8"?>
  <!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

 <hibernate-mapping>
   <class name="sally.Employee" table="EMPLOYEE">
     <meta attribute="class-description">
     This class contains the employee detail.
     </meta>
     <id name="id" type="int" column="id">
      <generator class="native"/>
     </id>
    <property name="firstName" column="first_name" type="string"/>
    <property name="lastName" column="last_name" type="string"/>
    <property name="salary" column="salary" type="int"/>
  </class>
  </hibernate-mapping>

<?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="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property    name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
    <property name="hibernate.connection.password"></property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="show_sql">true</property>


    <mapping class="sally.Employee"></mapping>
</session-factory>