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Frameworks & web · #spring
A Spring MVC endpoint returns HTTP 400 when a required @RequestParam is missing. Learn how to trace the cause to a name mismatch, missing default value, or binding conflict.
Use Flyway's Spring Boot starter to apply versioned SQL migrations on startup and keep schema in sync across environments.
Unbounded findAll() calls risk OOM as tables grow. Learn how Spring Data JPA Pageable bounds queries, why the default count query hurts, and when to switch to keyset pagination.
Configure Spring Boot Actuator health groups to provide distinct liveness and readiness signals for Kubernetes probes while protecting internal details.
A technical guide on choosing between Constructor and Setter injection in Spring, focusing on immutability, circular dependency detection, and architectural best practices.
Learn how Spring Boot profile‑specific externalized configuration lets you keep environment‑specific properties out of Java code, with a concrete example, verification steps, and cautions about secrets and activation mistakes.
Spring Boot 3.x AOT processing plus GraalVM native images cuts startup and memory for cloud-native services, but requires explicit reflection hints and accepts JVM runtime limits.
Learn how to replace Spring Data JPA’s Page with Slice to avoid costly count queries when paginating large datasets, and understand the trade‑offs involved.
A Spring Data JPA Page that returns too few rows usually means the COUNT query was never generated or was derived incorrectly. Diagnose it with SQL logging and fix it with explicit countQuery, Slice, or a custom fragment.
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