Spring Boot
Consistent Error Handling in Spring Boot REST APIs
Design one error contract for your whole API using @RestControllerAdvice, ProblemDetail, and validation groups.
2 min read
Category
Spring Boot
21 articles
Spring Boot
Spring Boot Startup Performance: Lazy Init, CDS, and What Actually Helps
A measured look at which Spring Boot startup optimizations move the needle in practice, from lazy initialization to Class Data Sharing and beyond.
3 min read
Spring Boot
Designing Idempotent Endpoints: Keys, Storage, and Semantics
A concrete pattern for idempotency keys in Spring Boot APIs, covering storage choice, request matching, and what to return on a replayed request.
3 min read
Spring Boot
Enforcing Module Boundaries in Spring Boot with Spring Modulith
How Spring Modulith turns package structure into an enforced architectural boundary, catching the coupling that code review alone tends to miss.
2 min read
Spring Boot
Shipping Spring Boot as a GraalVM Native Image
What actually changes when you compile Spring Boot to a GraalVM native image, and the reflection and initialization pitfalls that trip up the build.
3 min read
Spring Boot
Observability in Spring Boot with Micrometer and OpenTelemetry
How Micrometer and OpenTelemetry fit together in a Spring Boot service, and which metrics and traces are worth instrumenting by hand versus for free.
3 min read
Spring Boot
DTO Mapping in Spring Boot: MapStruct vs. Hand-Written Mappers
Comparing MapStruct's generated mappers against hand-written mapping code across boilerplate, performance, and how each handles change over time.
3 min read
Spring Boot
Pagination and Sorting APIs That Actually Scale
Why offset pagination falls apart under real data volume, and how to design keyset-based pagination and sorting APIs that stay fast at scale.
3 min read
Spring Boot
Database Migrations with Flyway in a CI/CD Pipeline
Practical rules for writing Flyway migrations that survive a real CI/CD pipeline, including rollback strategy and how to handle schema drift across environments.
3 min read
Spring Boot
@Scheduled and @Async: The Thread Pools You Can't Leave on Default
Why the default executors behind @Scheduled and @Async are wrong for production, and how to configure thread pools that actually match your workload.
3 min read
Spring Boot
Decoupling with Spring Application Events and @EventListener
Using Spring's application event system to decouple side effects from core business logic, and the transactional pitfalls that come with it.
3 min read
Spring Boot
Bean Validation Beyond @NotNull: Groups, Custom Constraints, and Cross-Field Rules
Moving past @NotBlank and @Email to validation groups, custom constraint annotations, and cross-field rules that Bean Validation can express cleanly.
3 min read
Spring Boot
Circuit Breakers, Bulkheads, and Retries: Resilience4j in Spring Boot
How to combine Resilience4j's circuit breaker, bulkhead, and retry modules in Spring Boot without letting them fight each other.
3 min read
Spring Boot
WebClient in Production: Timeouts, Retries, and Connection Pools
The WebClient configuration that RestTemplate never forced you to think about, and why the defaults are wrong for most production traffic.
3 min read
Spring Boot
Test Slices: @WebMvcTest, @DataJpaTest, and Knowing When to Skip Them
How Spring Boot's test slice annotations work, where they save real time, and the point at which reaching for @SpringBootTest is the better call.
2 min read
Spring Boot
Configuration Profiles and Externalized Config, Done Right
A pragmatic approach to Spring profiles and externalized configuration that avoids property sprawl and keeps environment differences honest.
2 min read
Spring Boot
The Actuator Endpoints Worth Exposing (and How to Lock Them Down)
Which Spring Boot Actuator endpoints earn their place in production, and the security configuration that keeps them from becoming an attack surface.
2 min read
Spring Boot
Building Stateless JWT Authentication with Spring Security
A working approach to stateless JWT authentication in Spring Security, covering filter placement, claims, and the token revocation problem it doesn't solve.
2 min read
Spring Boot
Spring's Caching Annotations: Where They Bite
The gap between what @Cacheable looks like it does and what it actually does, including key collisions, exception handling, and self-invocation.
3 min read
Spring Boot
Hunting Down N+1 Queries in JPA Before They Hunt You
Practical techniques for spotting N+1 query problems in Hibernate and JPA before they show up as a production latency incident.
2 min read
Spring Boot
Understanding @Transactional: Propagation, Rollback Rules, and the Proxy Behind It
A practical look at how Spring's @Transactional works through dynamic proxies, why self-invocation silently breaks it, and how propagation settings actually behave.
3 min read