SecurityConfig.java

package demo;

import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.authentication.configuration.EnableGlobalAuthentication;
import org.springframework.security.config.annotation.authentication.configurers.GlobalAuthenticationConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;

@Configuration
@EnableGlobalAuthentication
public class SecurityConfig extends GlobalAuthenticationConfigurerAdapter {

	private final UserDetailsService userDetailsService;

	public SecurityConfig(UserDetailsService userDetailsService) {
		this.userDetailsService = userDetailsService;
	}

	@Override
	public void init(AuthenticationManagerBuilder auth) throws Exception {
		auth.userDetailsService(this.userDetailsService);
	}

}