Spring: remember me cookie not set - spring

Question

I can't seem to get a cookie of spring that remembers the session, nor is the persistent_logins table of the dataSource getting populated. Why isn't the cookie received by the client?
Application context xml file :
<?xml version="1.0" encoding="UTF-8"?>
<bean:beans>
<http>
...
<remember-me data-source-ref="dataSource"
user-service-ref="userService" />
</http>
<authentication-manager alias="authenticationManager">
<authentication-provider user-service-ref="userService">
<password-encoder hash="md5" ref="passwordEncoder">
<salt-source ref="saltSource" />
</password-encoder>
</authentication-provider>
</authentication-manager>
...
</bean:beans>
login method:
#Service
public class AServiceImpl extends RemoteServiceServlet implements AService {
#Override
public boolean login(String username, String password, boolean remember) {
Collection<GrantedAuthority> auths = userDetailsService.getGrantedAuthorities(user);
auth = new UsernamePasswordAuthenticationToken(username, password, auths);
Authentication result = authenticationManager.authenticate(auth);
SecurityContextHolder.getContext().setAuthentication(result);
getThreadLocalRequest().getSession().setAttribute(HttpSessionSecurityContextRepository.SPRING_SECURITY_CONTEXT_KEY,SecurityContextHolder.getContext());
rememberMeServices.loginSuccess(getThreadLocalRequest(),getThreadLocalResponse(), auth);
}
}