org.hibernate.MappingException: Unknown entity:

I really want to understand what is going on with my code.

I have a standalone application which uses spring and Hibernate as JPA and I am trying to run the test using a single main Class

My main class

package edu.acct.tsegay.common;

import edu.acct.tsegay.model.User;
import edu.acct.tsegay.business.IUserBusinessObject;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {
    public static void main(String[] args) {
        try {
            ApplicationContext context = new ClassPathXmlApplicationContext(
                    "Spring3AndHibernate-servlet.xml");
            IUserBusinessObject userBusinessObject = (IUserBusinessObject) context
                    .getBean("userBusiness");

            User user = (User) context.getBean("user1");
            user.setPassword("pass");
            user.setUsername("tsegay");
            System.out.println(user.getPassword());

            userBusinessObject.delete(user);

            User user2 = new User();
            user2.setUsername("habest");
            user2.setPassword("pass1");
            System.out.println(user2.getPassword());
            /*
             * userBusinessObject.save(user2);
             * 
             * User user3 = userBusinessObject.searchUserbyId("tsegay");
             * System.out.println("Search Result: " + user3.getUsername());
             */
            System.out.println("Success");
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

my application context is:

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

    <!-- data source -->
    <bean id="dataSource"
        cl