SecurityDemoMyUserDelailsService.java

package com.raj.service;

import com.raj.model.User;
import com.raj.repository.UserRepository;
import com.raj.securingweb.UserPrincipal;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;

@Service
public class MyUserDetailsService implements UserDetailsService {

    @Autowired
    private UserRepository userRepository;

    @Override
    public UserDetails loadUserByUsername(String email) throws UsernameNotFoundException {
        User user = userRepository.findByEmail(email);
        if( user == null) {
            throw new UsernameNotFoundException("User Not found 404");
        }
        return new UserPrincipal(user);
    }
}