Spring: @ConfigurationProperties binds relaxed, @Value does not

@ConfigurationProperties matches app.max-retries, APP_MAX_RETRIES and app.maxRetries as the same key. @Value("${app.maxRetries}") is an exact lookup - so the environment variable your deployment sets never reaches it.

• 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: an exception in a Filter never reaches @RestControllerAdvice
• Spring: @Async on a void method throws its exception into the void

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Published 2026-08-25

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