Spring Security + Core API + API returns 404 instead of 401

Question

I have a spring boot application working with spring security using basic auth. When the correct basic credentials are supplied, the controller method is called, but for the wrong authorization credentials, I get 404 Not Found instead of 401 Unauthorized.

This is my spring Security Configuration

@Configuration
public static class ApiSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {

        http
            .antMatcher("/useradmin/api")
            .authorizeRequests()
                .anyRequest().authenticated()
                .and()
            .httpBasic().authenticationEntryPoint(authenticationEntryPoint()).and().csrf().disable();

    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication()
                .withUser("default").password("password").roles("USER");
    }
}

I examined Spring security with a baseline auth redirect to / error for invalid credentials , and if I exclude ErrorMvcAutoConfiguration.classfrom the Auto Configuration classes, I get 401. However, if I left it autoconfigured, I only get 404, and it doesn't actually redirect to /erroras mentioned above.

BasicErrorController, getError, , , - 401 404.

?