how to add roles on the login page? - spring

Question

I've using Spring and webflow to create a login page, but I do not know how to import the value of the database tables and put it in my program to control access with user roles. Here are some of my code.
the security-config.xml
<?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:security="http://www.springframework.org/schema/security"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security.xsd">
<security:http auto-config="true">
<security:form-login login-page="/app/main" default-target-url="/app/account" />
<security:logout logout-url="/app/logout" logout-success-url="/app/main" />
</security:http>
<security:authentication-manager>
<security:authentication-provider user-service-ref="userServices">
<security:password-encoder hash="md5"/>
</security:authentication-provider>
</security:authentication-manager>
<bean id="daoAuthenticationProvider" class="org.springframework.security.authentication.dao.DaoAuthenticationProvider">
<property name="userDetailsService" ref="userServices" />
<property name="hideUserNotFoundExceptions" value="false" />
</bean>
<bean id="authenticationManager" class="org.springframework.security.authentication.ProviderManager">
<constructor-arg>
<ref bean="daoAuthenticationProvider" />
</constructor-arg>
</bean>
</beans>
and this is my account-flow.xml
<?xml version="1.0" encoding="UTF-8"?>
<flow xmlns="http://www.springframework.org/schema/webflow"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/webflow
http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">
<secured attributes="ROLE_USER"/>
<view-state id="home" view="accountHome.xhtml">
</view-state>
</flow>
the methode where i loadAccesto my user
public UserDetails loadUserByUsername(String userName) throws UsernameNotFoundException {
UserEntity user = userDao.loadUserByUserName(userName);
if(user == null){
throw new UsernameNotFoundException(String.format("Etulisateur introuvable '%s'", userName));
}
Collection<GrantedAuthority> authorities = new ArrayList<GrantedAuthority>();
authorities.add(new SimpleGrantedAuthority("ROLE_USER"));
User userDetails = new User(user.getUserName(), user.getPassWord(), authorities);
return userDetails;
}