Spring: an exception in a Filter never reaches @RestControllerAdvice

@ControllerAdvice is wired into DispatcherServlet. A filter runs before the servlet, so anything thrown there bypasses the whole handler-exception mechanism and comes back as the container's HTML error page - JSON API, HTML 500.

• Spring: @Cacheable does not cache what you think when the key collides
• Spring: RestTemplate and WebClient ship with no timeout at all
• Spring: @Order does not control bean creation order
• Spring: application events are synchronous and join the caller's transaction
• Spring: @ConfigurationProperties binds relaxed, @Value does not
• Spring: @Async on a void method throws its exception into the void

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Published 2026-08-25

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