package ${package}.domain;

import java.util.Collections;

import javax.annotation.PostConstruct;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.*;
import org.springframework.stereotype.Service;

import com.github.kolorobot.domain.User;

@Service("userService")
public class UserService implements UserDetailsService {
	
	@Autowired
	private UserRepository userRepository;
	
	@PostConstruct	
	protected void initialize() {
		userRepository.save(new User("user", "demo", "ROLE_USER"));
		userRepository.save(new User("admin", "admin", "ROLE_ADMIN"));
	}
	
	@Override
	public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
		User user = userRepository.findByUsername(username);
		if(user == null) {
			throw new UsernameNotFoundException("user not found");
		}
		GrantedAuthority authority = new SimpleGrantedAuthority(user.getRole());
		return new org.springframework.security.core.userdetails.User(user.getUsername(), user.getPassword(), Collections.singleton(authority));
	}

}

package ${package}.domain;

import java.util.Collections;

import javax.annotation.PostConstruct;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.*;
import org.springframework.stereotype.Service;

import ${package}.domain.User;

@Service("userService")
public class UserService implements UserDetailsService {
	
	@Autowired
	private UserRepository userRepository;
	
	@PostConstruct	
	protected void initialize() {
		userRepository.save(new User("user", "demo", "ROLE_USER"));
		userRepository.save(new User("admin", "admin", "ROLE_ADMIN"));
	}
	
	@Override
	public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
		User user = userRepository.findByUsername(username);
		if(user == null) {
			throw new UsernameNotFoundException("user not found");
		}
		GrantedAuthority authority = new SimpleGrantedAuthority(user.getRole());
		return new org.springframework.security.core.userdetails.User(user.getUsername(), user.getPassword(), Collections.singleton(authority));
	}

}

Fix for nondinamic package.