Spring Security 5 : There is no PasswordEncoder mapped for the id “null”

When you are configuring the ClientDetailsServiceConfigurer, you have to also apply the new password storage format to the client secret.

.secret("{noop}secret")

Add .password("{noop}password") to Security config file.

For example :

auth.inMemoryAuthentication()
        .withUser("admin").roles("ADMIN").password("{noop}password");

For anyone facing the same issue and not in need of a secure solution – for testing and debugging mainly – in memory users can still be configured.

This is just for playing around – no real world scenario.

The approach used below is deprecated.

This is where I got it from:

• source
• reference, also mentioned in the source above

Within your WebSecurityConfigurerAdapter add the following:

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

Here, obviously, passwords are hashed, but still are available in memory.

Of course, you could also use a real PasswordEncoder like BCryptPasswordEncoder and prefix the password with the correct id:

// Create an encoder with strength 16
BCryptPasswordEncoder encoder = new BCryptPasswordEncoder(16);
String result = encoder.encode("myPassword");
assertTrue(encoder.matches("myPassword", result));

Don’t know if this will help anyone. My working WebSecurityConfigurer and OAuth2Config code as below:

OAuth2Config File:

package com.crown.AuthenticationServer.security;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.oauth2.config.annotation.configurers.ClientDetailsServiceConfigurer;
import org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerConfigurerAdapter;
import org.springframework.security.oauth2.config.annotation.web.configurers.AuthorizationServerEndpointsConfigurer;

@Configuration
public class OAuth2Config extends AuthorizationServerConfigurerAdapter {

    @Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.inMemory()
            .withClient("crown")
            .secret("{noop}thisissecret")
            .authorizedGrantTypes("refresh_token", "password", "client_credentials")
            .scopes("webclient", "mobileclient");
    }

    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        endpoints
            .authenticationManager(authenticationManager)
            .userDetailsService(userDetailsService);
    }
}

WebSecurityConfigurer:

package com.crown.AuthenticationServer.security;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.factory.PasswordEncoderFactories;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;


@Configuration
public class WebSecurityConfigurer extends WebSecurityConfigurerAdapter {

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

    @Bean
    @Override
    public UserDetailsService userDetailsService() {

        PasswordEncoder encoder = PasswordEncoderFactories.createDelegatingPasswordEncoder();

        final User.UserBuilder userBuilder = User.builder().passwordEncoder(encoder::encode);
        UserDetails user = userBuilder
            .username("john.carnell")
            .password("password")
            .roles("USER")
            .build();

        UserDetails admin = userBuilder
            .username("william.woodward")
            .password("password")
            .roles("USER","ADMIN")
            .build();

        return new InMemoryUserDetailsManager(user, admin);
    }

}

Here is the link to the project:
springboot-authorization-server-oauth2