использование DAO, service и пр

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package com;

import java.io.Serializable;
import java.math.BigDecimal;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;

/**
 *
 * @author Admin
 */
@Entity
@Table(name = "users")
@NamedQueries({
    @NamedQuery(name = "Users.findAll", query = "SELECT u FROM Users u"),
    @NamedQuery(name = "Users.findById", query = "SELECT u FROM Users u WHERE u.id = :id"),
    @NamedQuery(name = "Users.findByName", query = "SELECT u FROM Users u WHERE u.name = :name"),
    @NamedQuery(name = "Users.findBySurname", query = "SELECT u FROM Users u WHERE u.surname = :surname")})
public class Users implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "id")
    private BigDecimal id;
    @Column(name = "name")
    private String name;
    @Column(name = "surname")
    private String surname;

    public Users() {
    }

    public Users(BigDecimal id) {
        this.id = id;
    }

    public BigDecimal getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Users)) {
            return false;
        }
        Users other = (Users) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "com.Users[id=" + id + "]";
    }

}

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package dao;

import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

/**
 *
 * @author Admin
 */
import com.Users;
import org.springframework.orm.hibernate3.HibernateTemplate;

public class usersDAO extends HibernateDaoSupport implements IusersDAO {
    EntityManagerFactory emf = Persistence.createEntityManagerFactory("MyAppPU");

    HibernateTemplate hibernateTemplate;

    public void save(Users user) {
        getHibernateTemplate().saveOrUpdate(user);
    }

    public void delete(Users user) {
        getHibernateTemplate().saveOrUpdate(user);
    }


}

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package service;

/**
 *
 * @author Admin
 */
import com.Users;
import dao.IusersDAO;
public class usersService implements IusersService{
    private IusersDAO dao;

    public void deleteUser(Users user){
        dao.save(user);
    }
    public void saveUser(Users user){
        dao.delete(user);
    }

}

<?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.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
    <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
    <property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/postgres</property>
    <property name="hibernate.connection.username">postgres</property>
    <property name="hibernate.connection.password">root</property>
  </session-factory>
</hibernate-configuration>

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package com;

/**
 *
 * @author Admin
 */
import java.math.BigDecimal;
import service.IusersService;

public class run {
    private static IusersService service;
    public static void main(String args[]){
        Users usr = new Users();
        usr.setId(BigDecimal.ONE);
        usr.setName("jake");
        usr.setSurname("smirnov");
        service.saveUser(usr);    
    }

}