Intermediate6 min read
Spring Boot Auto-Configuration Deep Dive
How Spring Boot auto-configuration actually works: the import selector, the @Conditional family, ordering rules, the --debug report, and how to write your own starter.
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Spring Boot Internals & Mastery
Stop treating Spring Boot as magic. Auto-configuration, the IoC container lifecycle, AOP proxies, caching, scheduling, JPA and Redis — how each one actually works, and what breaks when it does not.
Intermediate6 min read
Spring IoC Container Internals
The Spring container from the inside: the full bean lifecycle in order, what BeanPostProcessor actually intercepts, every bean scope, and how circular dependencies are resolved.
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Configuration & Profiles Mastery
Type-safe configuration with @ConfigurationProperties, the full property precedence order, relaxed binding rules, profile groups, and keeping secrets out of your YAML.
Read tutorialAdvanced6 min read
Spring AOP & Aspect-Oriented Programming
Spring AOP from pointcut syntax to proxy mechanics: the five advice types, writing annotation-driven aspects, aspect ordering, and why self-invocation silently does nothing.
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Actuator & Observability Endpoints
Every Actuator endpoint worth exposing, writing custom health indicators for Kubernetes probes, adding Micrometer metrics that answer real questions, and securing it all.
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Spring Boot Testing Masterclass
A test strategy that stays fast: when to use @SpringBootTest versus a slice, real databases with Testcontainers and @ServiceConnection, stubbing HTTP with WireMock, and context caching.
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Exception Handling & Error Response Design
A consistent error contract for a Spring Boot API: an exception hierarchy worth having, @ControllerAdvice done properly, RFC 7807 ProblemDetail, and validation errors clients can act on.
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Caching Strategies in Spring Boot
Spring cache abstraction in practice: @Cacheable key design, choosing between Caffeine and Redis, per-cache TTLs, cache stampedes, and a two-level cache that survives a Redis outage.
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Scheduling & Async Processing
Scheduled tasks and async methods done properly: fixedRate versus fixedDelay, sizing executors, exception handling that does not silently swallow, and distributed locking with ShedLock.
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Spring Data JPA Deep Dive
Entity mapping that scales: relationship pitfalls, diagnosing and fixing the N+1 problem, derived queries versus Specifications, pagination that stays fast, and JPA auditing.
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Redis with Spring Boot
Redis beyond caching: choosing the right data structure, distributed locks that are actually safe, Redis Streams as a queue, and configuring Lettuce for Sentinel and Cluster.
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Validation & Data Integrity
Jakarta Bean Validation in Spring Boot: the full constraint set, custom validators, validation groups, cross-field rules, method validation and where each layer belongs.
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Logging & Debugging in Production
Logging that helps at 3am: choosing levels that mean something, MDC correlation IDs across threads, structured JSON output, async appenders, and what must never be logged.
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File Handling & Object Storage
Handling uploads and downloads safely: multipart limits, detecting real content types with Tika, streaming large files, S3 and MinIO integration, and presigned URLs.
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