OAuth2Config.java

package demo;

import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.oauth2.config.annotation.configurers.ClientDetailsServiceConfigurer;
import org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerConfigurerAdapter;
import org.springframework.security.oauth2.config.annotation.web.configuration.EnableAuthorizationServer;
import org.springframework.security.oauth2.config.annotation.web.configurers.AuthorizationServerEndpointsConfigurer;

@Configuration
@EnableAuthorizationServer
class OAuth2Config extends AuthorizationServerConfigurerAdapter {

	private final AuthenticationManager authenticationManager;

	public OAuth2Config(AuthenticationManager authenticationManager) {
		this.authenticationManager = authenticationManager;
	}

	@Override
	public void configure(AuthorizationServerEndpointsConfigurer endpoints)
			throws Exception {
		endpoints.authenticationManager(this.authenticationManager);
	}

	@Override
	public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
		clients.inMemory().withClient("acme").secret("acmesecret")
				.authorizedGrantTypes("authorization_code", "refresh_token", "password")
				.scopes("openid");
	}

}