$ javac SecurityConfig.java   # Boot 3 file, import repointed to the 4.1.2 package; the old method-chaining DSL left as it was
SecurityConfig.java:16: error: method authorizeHttpRequests in class HttpSecurity cannot be applied to given types;
        http.authorizeHttpRequests()
            ^
  required: Customizer<AuthorizeHttpRequestsConfigurer<HttpSecurity>.AuthorizationManagerRequestMatcherRegistry>
  found:    no arguments
  reason: actual and formal argument lists differ in length
1 error