Reject @RequestMapping and @HttpExchange declarations on the same element

[sbrannen]

Overview

As a follow up to #31962 and #32049, we have decided to reject adjacent @RequestMapping and @HttpExchange declarations on a @Controller class or on a @Controller handler method in MVC and WebFlux.

Note, however, that doing so will still allow a @Controller class which implements an interface annotated with @HttpExchange annotations to inherit the @HttpExchange declarations from the interface or optionally override them locally with @HttpExchange or @RequestMapping annotations.

Related Issues

• Log warning if multiple @PostMapping, @GetMapping, etc. annotations are declared #31962
• Reject multiple @HttpExchange declarations on the same element #32049

[sbrannen]

Note, however, that doing so will still allow a @Controller class which implements an interface annotated with @HttpExchange annotations to inherit the @HttpExchange declarations from the interface or optionally override them locally with @HttpExchange or @RequestMapping annotations.

Reopening to ensure the above is supported.