Problem Description:

Use springboot, use spring security for permission management, use memory user authentication, but no response, error report:

java.lang.IllegalArgumentException: There is no PasswordEncoder mapped for the id “null”

Solutions

①Create mypasswordencoder class, implement passwordencoder, and annotate @ 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 {
        //If the program reports an error There is no PasswordEncoder mapped for the id "null", comment the paragraph and add the following code
        //or add a @Component annotation to MyPasswordEncoder class to make it a bean
        auth.inMemoryAuthentication().withUser("admin").password("123456").authorities("ADMIN_ADD", "ADMIN_FIND");// customize the login user name and password and give some permissions
    }

②:

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        

        //This one uses the anonymous internal class
        auth.inMemoryAuthentication().passwordEncoder(new MyPasswordEncoder()).withUser("lxy").password("lxy").authorities("ADMIN_ADD","ADMIN_FIND");
    }