Spring Security Customizing Authorization Endpoint URL - spring

Question

I am implementing a Spring MVC REST web service and attempting to security it with Spring Security Oauth2.
My authorization URL is at the following address (note that there is no registration id):
http://localhost:8080/myoauthserver/oauthservlet
So, in my Spring Security Config, I have this:
#Bean
#Profile("dev")
public ClientRegistration devClientRegistration() {
// set up variables to pass to ClientRegistration
ClientRegistration result = ClientRegistration
.withRegistrationId("") // this obviously doesn't work
.clientId(clientId)
.clientSecret(clientSecret)
.authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)
.authorizationUri(authorizationUri)
.tokenUri(clientSecret)
.userInfoUri(userInfoUri)
.userNameAttributeName(userNameAttribute)
.redirectUri(redirectUrl)
.providerConfigurationMetadata(providerDetails)
.build();
return result;
}
#Bean
public ClientRegistrationRepository clientRegistrationRepository() {
ClientRegistrationRepository repository = new InMemoryClientRegistrationRepository(devClientRegistration());
return repository;
}
#Bean
#Profile("dev")
public SecurityFilterChain securityWebFilterChain(HttpSecurity http) throws Exception {
// this prevents throwing an exception in the oauth2 lambda function
Map<String, String> loginProps = ...
http
.authorizeRequests()
// what we want is for a few urls to be accessible to all, but most to require
// oauth authentication/authorization
.antMatchers("/login/**","/error/**", "/oauth2/**").anonymous()
.anyRequest().authenticated()
.and()
.oauth2Login(oauth2 -> {
oauth2
.clientRegistrationRepository(clientRegistrationRepository(loginPropsCopy))
.authorizationEndpoint()
.baseUri("http://localhost:8080/myoauthserver/oauthservlet");
}
);
return http.build();
}
How do I customize the entire authorization endpoint to not try to tack the registration id onto it?