SpringBoot2.x 关于SocialAutoConfigurerAdapter缺失问题

public abstract class SocialAutoConfigurerAdapter extends SocialConfigurerAdapter {
    public SocialAutoConfigurerAdapter() {
    }
    public void addConnectionFactories(ConnectionFactoryConfigurer configurer, Environment environment) {
        configurer.addConnectionFactory(this.createConnectionFactory());
    }
    protected abstract ConnectionFactory<?> createConnectionFactory();
}

public abstract class SocialProperties {
    private String appId;
    private String appSecret;
    public SocialProperties() {
    }
    public String getAppId() {
        return this.appId;
    }
    public void setAppId(String appId) {
        this.appId = appId;
    }
    public String getAppSecret() {
        return this.appSecret;
    }
    public void setAppSecret(String appSecret) {
        this.appSecret = appSecret;
    }
}

@Configuration
@ConditionalOnClass({ConnectController.class, SocialConfigurerAdapter.class})
@ConditionalOnBean({ConnectionFactoryLocator.class, UsersConnectionRepository.class})
@AutoConfigureBefore({ThymeleafAutoConfiguration.class})
@AutoConfigureAfter({WebMvcAutoConfiguration.class})
public class SocialWebAutoConfiguration {
    public SocialWebAutoConfiguration() {
    }

    private static class SecurityContextUserIdSource implements UserIdSource {
        private SecurityContextUserIdSource() {
        }

        public String getUserId() {
            SecurityContext context = SecurityContextHolder.getContext();
            Authentication authentication = context.getAuthentication();
            Assert.state(authentication != null, "Unable to get a ConnectionRepository: no user signed in");
            return authentication.getName();
        }
    }

    @Configuration
    @ConditionalOnClass({SpringResourceResourceResolver.class})
    protected static class SpringSocialThymeleafConfig {
        protected SpringSocialThymeleafConfig() {
        }

        @Bean
        @ConditionalOnMissingBean
        public SpringSocialDialect springSocialDialect() {
            return new SpringSocialDialect();
        }
    }

    @Configuration
    @EnableSocial
    @ConditionalOnWebApplication
    @ConditionalOnClass({SecurityContextHolder.class})
    protected static class AuthenticationUserIdSourceConfig extends SocialConfigurerAdapter {
        protected AuthenticationUserIdSourceConfig() {
        }

        public UserIdSource getUserIdSource() {
            return new SocialWebAutoConfiguration.SecurityContextUserIdSource();
        }
    }

    @Configuration
    @EnableSocial
    @ConditionalOnWebApplication
    @ConditionalOnMissingClass({"org.springframework.security.core.context.SecurityContextHolder"})
    protected static class AnonymousUserIdSourceConfig extends SocialConfigurerAdapter {
        protected AnonymousUserIdSourceConfig() {
        }

        public UserIdSource getUserIdSource() {
            return new UserIdSource() {
                public String getUserId() {
                    return "anonymous";
                }
            };
        }
    }

    @Configuration
    @EnableSocial
    @ConditionalOnWebApplication
    protected static class SocialAutoConfigurationAdapter extends SocialConfigurerAdapter {
        private final List<ConnectInterceptor<?>> connectInterceptors;
        private final List<DisconnectInterceptor<?>> disconnectInterceptors;
        private final List<ProviderSignInInterceptor<?>> signInInterceptors;

        public SocialAutoConfigurationAdapter(ObjectProvider<List<ConnectInterceptor<?>>> connectInterceptorsProvider, ObjectProvider<List<DisconnectInterceptor<?>>> disconnectInterceptorsProvider, ObjectProvider<List<ProviderSignInInterceptor<?>>> signInInterceptorsProvider) {
            this.connectInterceptors = (List)connectInterceptorsProvider.getIfAvailable();
            this.disconnectInterceptors = (List)disconnectInterceptorsProvider.getIfAvailable();
            this.signInInterceptors = (List)signInInterceptorsProvider.getIfAvailable();
        }

        @Bean
        @ConditionalOnMissingBean({ConnectController.class})
        public ConnectController connectController(ConnectionFactoryLocator factoryLocator, ConnectionRepository repository) {
            ConnectController controller = new ConnectController(factoryLocator, repository);
            if (!CollectionUtils.isEmpty(this.connectInterceptors)) {
                controller.setConnectInterceptors(this.connectInterceptors);
            }

            if (!CollectionUtils.isEmpty(this.disconnectInterceptors)) {
                controller.setDisconnectInterceptors(this.disconnectInterceptors);
            }

            return controller;
        }

        @Bean
        @ConditionalOnMissingBean
        @ConditionalOnProperty(
            prefix = "spring.social",
            name = {"auto-connection-views"}
        )
        public BeanNameViewResolver beanNameViewResolver() {
            BeanNameViewResolver viewResolver = new BeanNameViewResolver();
            viewResolver.setOrder(-2147483648);
            return viewResolver;
        }

        @Bean
        @ConditionalOnBean({SignInAdapter.class})
        @ConditionalOnMissingBean
        public ProviderSignInController signInController(ConnectionFactoryLocator factoryLocator, UsersConnectionRepository usersRepository, SignInAdapter signInAdapter) {
            ProviderSignInController controller = new ProviderSignInController(factoryLocator, usersRepository, signInAdapter);
            if (!CollectionUtils.isEmpty(this.signInInterceptors)) {
                controller.setSignInInterceptors(this.signInInterceptors);
            }

            return controller;
        }
    }
}