spring boot 整合security报错：There is no PasswordEncoder mapped for the id "null"

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spring security报错：There is no PasswordEncoder mapped for the id "null"

1、问题描述：在写基于Spring cloud微服务的OAuth2认证服务时，因为Spring-Security从4+升级到5+

2、 解决方案：在security配置类中，添加

@Bean
public static NoOpPasswordEncoder passwordEncoder() {
    return (NoOpPasswordEncoder) NoOpPasswordEncoder.getInstance();
}

import org.springframework.security.crypto.password.NoOpPasswordEncoder;会显示失效，但可解决问题，亲测有效。

摘自：https://blog.csdn.net/dream_an/article/details/79381459