erro tenta salvar o objeto

Boa tarde senhores.

Estou com o seguinte problema, o Meu DAO sempre fica null, alguem poderia me ajudar a resolver o problema? segui abaixo o codigo:
web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="3.0"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
	<display-name>HelloWorld</display-name>

<context-param>
		<param-name>flex.class.path</param-name>
		<param-value>/WEB-INF/flex/hotfixes,/WEB-INF/flex/jars</param-value>
	</context-param>

<context-param>
		<param-name>log4jConfigLocation</param-name>
		<param-value>/WEB-INF/classes/log4j.properties</param-value>
	</context-param>

<filter>
		<filter-name>lazyLoadingFilter</filter-name>
		<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>lazyLoadingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<listener>
		<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
	</listener>

<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

<listener>
		<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
	</listener>
	<listener>
		<listener-class>flex.messaging.HttpFlexSession</listener-class>
	</listener>

<servlet>
		<servlet-name>spring</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/applicationContext.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

<servlet>
		<servlet-name>MessageBrokerServlet</servlet-name>
		<servlet-class>flex.messaging.MessageBrokerServlet</servlet-class>
		<init-param>
			<param-name>services.configuration.file</param-name>
			<param-value>/WEB-INF/flex/services-config.xml</param-value>
		</init-param>

<init-param>
			<param-name>flex.write.path</param-name>
			<param-value>/WEB-INF/flex</param-value>
		</init-param>

<load-on-startup>1</load-on-startup>
	</servlet>

<servlet>
		<servlet-name>RDSDispatchServlet</servlet-name>
		<servlet-class>flex.rds.server.servlet.FrontEndServlet</servlet-class>
		<init-param>
			<param-name>useAppserverSecurity</param-name>
			
			<param-value>false</param-value>
		</init-param>
		<load-on-startup>10</load-on-startup>
	</servlet>
	<servlet-mapping id="RDS_DISPATCH_MAPPING">
		<servlet-name>RDSDispatchServlet</servlet-name>
		<url-pattern>/CFIDE/main/ide.cfm</url-pattern>
	</servlet-mapping>
	<servlet-mapping>
		<servlet-name>MessageBrokerServlet</servlet-name>
		<url-pattern>/messagebroker/*</url-pattern>
	</servlet-mapping>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
	</welcome-file-list>
</web-app>

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>

<property name="packagesToScan">
			<list>
				
				
				<value>br.com.ss.procasa.model.entity</value>
				
				<value>br.com.ss.seguranca.model.entity</value>
			</list>
		</property>

<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">
					org.hibernate.dialect.PostgreSQLDialect
				</prop>
				<prop key="hibernate.show_sql">true</prop>
				<prop key="hibernate.format_sql">true</prop>
				<prop key="hibernate.hbm2ddl.auto">update</prop>
			</props>
		</property>

<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory">
			<ref local="sessionFactory" />
		</property>
	</bean>

<tx:annotation-driven transaction-manager="transactionManager" />

<context:annotation-config />

<bean id="usuarioDAO" class="br.com.ss.seguranca.model.dao.impl.UsuarioDAO">
	</bean>

</beans>

services-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<services-config>

</security>

<channel-definition id="my-amf"
			class="mx.messaging.channels.AMFChannel">
			<endpoint
				url="http://{server.name}:{server.port}/{context.root}/messagebroker/amf"
				class="flex.messaging.endpoints.AMFEndpoint" />
		</channel-definition>

<channel-definition id="my-secure-amf"
			class="mx.messaging.channels.SecureAMFChannel">
			<endpoint
				url="https://{server.name}:{server.port}/{context.root}/messagebroker/amfsecure"
				class="flex.messaging.endpoints.SecureAMFEndpoint" />
			<properties>
				<add-no-cache-headers>false</add-no-cache-headers>
			</properties>
		</channel-definition>

<channel-definition id="my-polling-amf"
			class="mx.messaging.channels.AMFChannel">
			<endpoint
				url="http://{server.name}:{server.port}/{context.root}/messagebroker/amfpolling"
				class="flex.messaging.endpoints.AMFEndpoint" />
			<properties>
				<polling-enabled>true</polling-enabled>
				<polling-interval-seconds>4</polling-interval-seconds>
			</properties>
		</channel-definition>

</channels>

<logging>
		<target class="flex.messaging.log.ConsoleTarget" level="Error">
			<properties>
				<prefix>[BlazeDS] </prefix>
				<includeDate>false</includeDate>
				<includeTime>false</includeTime>
				<includeLevel>false</includeLevel>
				<includeCategory>false</includeCategory>
			</properties>
			<filters>
				<pattern>Endpoint.*</pattern>
				<pattern>Service.*</pattern>
				<pattern>Configuration</pattern>
			</filters>
		</target>
	</logging>

<system>
		<redeploy>
			<enabled>false</enabled>
			
		</redeploy>
	</system>

</services-config>

remoting-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<service id="remoting-service" class="flex.messaging.services.RemotingService">

<default-channels>
		<channel ref="my-amf" />
	</default-channels>

<destination id="helloWorldService">
		<properties>
			<source>com.erkobridee.helloworld.flex.service.HelloWorld</source>
		</properties>
	</destination>

	
	<destination id="usuarioService">
		<properties>
			<source>br.com.ss.seguranca.controller.service.impl.UsuarioService</source>
		</properties>
	</destination>
	
</service>

Na minha class UsusrioService o usuarioDAO sempre vem null nao sei pq ?

UsuarioService

package br.com.ss.seguranca.controller.service.impl;

import java.util.Date;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import br.com.ss.seguranca.controller.service.IUsuarioService;
import br.com.ss.seguranca.model.dao.impl.UsuarioDAO;
import br.com.ss.seguranca.model.entity.Usuario;

@Service(value="usuarioService")
@Transactional(propagation=Propagation.REQUIRED, rollbackFor=Exception.class)
public class UsuarioService implements IUsuarioService {

private UsuarioDAO usuarioDAO;

@Autowired
	public void setUsuarioDAO(UsuarioDAO iUsuarioDAO) {
		this.usuarioDAO = iUsuarioDAO;
	}
	
	public String aloMsg(String msg) throws Exception {
		System.out.println(" teste insert wwww");
		msg = msg + " robson ";
		Usuario usuario = new Usuario();
		usuario.setDtCadastro(new Date());
		usuario.setTxLogin("ww");
		usuario.setTxSenha("www");
		usuario.setTxEmail("oi");
		usuario.setCsStatus((short) 0);
		usuario.setIdUsuario(1);
		
		try {
			this.usuarioDAO.save(usuario);
		} catch (Exception e) {
			throw new Exception("N�o foi poss�vel salvar." + e.getCause());
		}
		return msg;
	}

@Override
	public Usuario save(Usuario usuario) throws Exception {
		try {
			this.usuarioDAO.save(usuario);
			return usuario;
		} catch (Exception e) {
			throw new Exception("N�o foi poss�vel salvar." + e.getCause());
		}
	}

@Override
	public void remove(Usuario p_usuario) throws Exception {
		try {
			this.usuarioDAO.remove(p_usuario);
		} catch (Exception e) {
			throw new Exception("N�o foi poss�vel excluir." + e.getMessage());
		}
	}

@Override
	public List<Usuario> getList() throws Exception {
		try {
			System.out.println("alooooooo ");
			return this.usuarioDAO.getList();
		} catch (Exception e) {
			throw new Exception("N�o foi poss�vel listar." + e.getMessage());
		}
	}

@Override
	public Usuario doLogin(String login, String senha) throws Exception {
		try {
			System.out.println("entrou no doLogin ");
			Usuario u = usuarioDAO.doLogin(login, senha);
			System.out.println("Dados do Usu�rio= \n " + u.toString());
			return u;
		} catch (Exception e) {
			throw new Exception("N�o foi poss�vel procurar pela ID."
					+ e.getMessage());
		}
	}

public String alo() {
		System.out.println(" qqqqqqq ************* alooooooo");
		return "wwwww eeeeeee robson ";
	}

}

UsuarioDAO

package br.com.ss.seguranca.model.dao.impl;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.dao.support.DataAccessUtils;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import org.springframework.stereotype.Repository;

import br.com.ss.seguranca.model.dao.IUsuarioDAO;
import br.com.ss.seguranca.model.entity.Usuario;

@Repository(value = "usuarioDAO")
public class UsuarioDAO extends HibernateDaoSupport implements IUsuarioDAO {

@Autowired
	public void setUsuarioDAO(@Qualifier("sessionFactory") SessionFactory sessionFactory) {
		setSessionFactory(sessionFactory);
	}

public Usuario save(Usuario usuario) {
		getHibernateTemplate().saveOrUpdate(usuario);
		return usuario;
	}

public void remove(Usuario usuario) {
		getHibernateTemplate().delete(usuario);
	}

@SuppressWarnings("unchecked")
	public List<Usuario> getList() {
		return getHibernateTemplate().loadAll(Usuario.class);
	}

public Usuario doLogin(String login, String senha) throws Exception {

Object[] params = new Object[] { login, senha };
		Usuario usuario = (Usuario) DataAccessUtils
				.requiredUniqueResult(getHibernateTemplate().find(
						"from Usuario u where u.login=? and u.senha=?", params));

if (usuario == null)
			throw new Exception("O Usuario com a ID: " + usuario + " do(a) "
					+ Usuario.class.getSimpleName() + " n�o foi encontrada.");
		return usuario;
	}

// @Override
	public List<Usuario> pesquisar(String campo, String texto) {

Query select = getSession().createQuery(
				"from Usuario where " + campo + " like:XX");
		select.setString("XX", texto);
		List<Usuario> filtro = select.list();

return filtro;

}

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