Error in creating an instance with jsf-spring-hibernate-mysql

I created in Netbeans a login with hibernate (annotations) and access to MySql but when I added Spring (also with annotations) I got stuck, already in the first attempt Spring does not create the instance of an object (dependency injection) . I have created the packages classes, bean, bo, bo.Spring, dao, dao.Spring with the following code as it corresponds:

In the Classes package the code is:

package clases;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="usuario_login", catalog="sipreli")
public class UsuarioLogin  implements java.io.Serializable {
    //@Column(name="usuario", unique=true, nullable=false, length=20)
    @Id
private String usuario;
    // @Column(name="contrasena", length=20)
     private String contrasena;
// sus respectivos métodos de geter y setter de las variables

In the bean package the code is:

package beans;
import clases.UsuarioLogin;
import bo.spring.IUsuarioBo;
import java.io.Serializable;
import java.util.List;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean
@SessionScoped
public class UsuarioBean implements Serializable{
    private UsuarioLogin elUsuario;
    private IUsuarioBo usuarioBo;  // variable de interface
    private List<UsuarioLogin> listaUsuario;
     public UsuarioBean (){
        elUsuario = new UsuarioLogin();
}
    public String entrar(UsuarioLogin elUsuario){
        boolean existe;
// --------- Aquí es donde me da error a la hora de crear la instancia de usuarioBo ------------
        existe = usuarioBo.entrar(elUsuario);
        if (existe) {
            return "index.xhtml";
        } else{
            return "";
        }
    }

In the bo package

package bo;
import clases.UsuarioLogin;
import bo.spring.IUsuarioBo;
import dao.spring.IUsuarioDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UsuarioBo implements IUsuarioBo {
 @Autowired
    private IUsuarioDao usuarioDao;
 @Override
    public boolean entrar(UsuarioLogin elUsuario) {
        return usuarioDao.entrar(elUsuario);
    }
    public void setUsuarioDao(IUsuarioDao usuarioDao) {
        this.usuarioDao = usuarioDao;
    }
}

In the bo.Spring package

package bo.spring;
import clases.UsuarioLogin;
public interface IUsuarioBo {
    boolean entrar (UsuarioLogin elUsuario);
}

The application.Context file has the following code

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
          http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-4.0.xsd
          http://www.springframework.org/schema/jee 
        http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
">
    <!--    <context:annotation-config/> -->    
    <context:component-scan base-package="cr.ac.icai.cursoslibres.javaavanzado.bo"/>
    <bean id="usuarioBo" class="cr.ac.icai.cursoslibres.javaavanzado.bo.UsuarioBo" >
        <property name="usuarioDao" ref="usuarioDao"/>
    </bean>
    <bean id="usuarioDao" class="cr.ac.icai.cursoslibres.javaavanzado.dao.UsuarioDao"/>
</beans>

The face-config file has the following code

<?xml version='1.0' encoding='UTF-8'?>
<faces-config version="2.2"
              xmlns="http://xmlns.jcp.org/xml/ns/javaee"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd">
    <application>
            <el-resolver>
                org.springframework.web.jsf.el.SpringBeanFacesELResolver
            </el-resolver>
    </application>
</faces-config>

The web.xml file has the following code (at the end of it, the first thing I think is the same as always)

<context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
<!--                    debe de ser igual al nombre del archivo context-->
            /WEB-INF/applicationContext.xml
        </param-value>
    </context-param>
    <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <listener>
    <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
    </listener>
 </web-app>

I suppose that the error (NullPointerException) is due to a theme of misuse of annotations (where and what annotations use) and the configuration file of Spring. I have done my homework and I have read tutorials, consulted videos but I can not see why Spring does not do the instantiation (dependency injection) of userBo in the enter method (see previous code).