解决java.lang.IllegalArgumentException: There is no PasswordEncoder mapped for the id "null" _exception:

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问题描述：
使用springboot，权限管理使用spring security，使用内存用户验证，但无响应报错：
java.lang.IllegalArgumentException: There is no PasswordEncoder mapped for the id "null"
解决方式
①：
创建MyPasswordEncoder类实现PasswordEncoder，加注解 @Component

@Component public class MyPasswordEncoder implements PasswordEncoder { @Override public String encode(CharSequence charSequence) { return charSequence.toString(); }@Override public boolean matches(CharSequence charSequence, String s) { return s.equals(charSequence.toString()); } }

@Override protected void configure(AuthenticationManagerBuilder auth) throws Exception { //如果程序报错There is no PasswordEncoder mapped for the id "null"，就将该段注释添加下边代码 //或者在MyPasswordEncoder类上加一个@Component注解,使它成为一个Bean auth.inMemoryAuthentication().withUser("admin").password("123456").authorities("ADMIN_ADD","ADMIN_FIND"); //自定义登录用户用户名和密码并赋予一些权限 }

②：

@Override protected void configure(AuthenticationManagerBuilder auth) throws Exception {//这个是使用了匿名内部类 auth.inMemoryAuthentication().passwordEncoder(new MyPasswordEncoder()).withUser("lxy").password("lxy").authorities("ADMIN_ADD","ADMIN_FIND"); }