An Employee entity

Employee.java

@Entity
@Table(name = "employees")
@NamedQueries({
    @NamedQuery(name = "com.javaeeeee.dwstart.core.Employee.findAll",
            query = "select e from Employee e"),
    @NamedQuery(name = "com.javaeeeee.dwstart.core.Employee.findByName",
            query = "select e from Employee e "
            + "where e.firstName like :name "
            + "or e.lastName like :name")
})
public class Employee {

    /**
     * Entity's unique identifier.
     */
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    /**
     * employee first name.
     */
    @Column(name = "first_name")
    private String firstName;
    /**
     * employee last name.
     */
    @Column(name = "last_name")
    private String lastName;
    /**
     * employee position.
     */
    @Column(name = "e_position")
    private String position;
    /**
     * employee phone.
     */
    private String phone;
    /**
     * employee e-mail.
     */
    private String e_mail;

    /**
     * A no-argument constructor.
     */
    public Employee() {
    }

    /**
     * A constructor to create employees. Id is not passed, cause it's
     * auto-generated by RDBMS.
     *
     * @param firstName employee first name
     * @param lastName employee last name
     * @param position employee position
     * @param phone employee phone
     * @param e_mail employee e-mail
     */
    public Employee(String firstName, String lastName, String position, String phone, String e_mail) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.position = position;
        this.phone = phone;
        this.e_mail = e_mail;
    }

    // Auto-generated equald, hashCode, getters and setters.
    ...
  }