Spring Security無法注入authenticationManager：No qualifying bean of type AuthenticationManager found for_Spring

出錯提示

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.security.authentication.AuthenticationManager] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {} 注入申明

    @Autowired    private AuthenticationManager authenticationManager;

解決方案

在WebSecurityConfigurerAdapter的實作類別當中，重寫authenticationManagerBean方法：

    @Bean(name = BeanIds.AUTHENTICATION_MANAGER)    @Override    public AuthenticationManager authenticationManagerBean() throws Exception {        return super.authenticationManagerBean();    }

參考

https://stackoverflow.com/questions/21633555/how-to-inject-authenticationmanager-using-java-configuration-in-a-custom-filter