Spring BootPacking Spring Boot into Lightweight Docker Images
Using multi-stage builds, layered jars, minimal JRE, and non-root users to create small, fast-building, and secure Spring Boot Docker images.
Sending and Receiving Kafka Messages in Spring Boot
Guide to using Spring Kafka to send messages with KafkaTemplate, receive with @KafkaListener, handle errors with Dead Letter Topic, and write tests with Embedded Kafka.
Pagination and Sorting with Pageable in Spring Boot
Use Pageable, Page, Slice, and Sort from Spring Data JPA for pagination and sorting data, from repository to REST controller, with tests and common pitfalls.
Transactions in Spring: @Transactional and Common Pitfalls
How @Transactional works through proxy, along with common pitfalls like self-invocation, checked exception, rollback-only, and tests that hide errors.
Handling Scheduled Tasks with @Scheduled in Spring Boot
How to use @Scheduled with fixedRate, fixedDelay and cron, configure thread pools, handle errors, write tests, and avoid common pitfalls with scheduled tasks.
Integration Testing with Testcontainers in Spring Boot 3
Write integration tests running on real PostgreSQL using Testcontainers and @ServiceConnection, share containers between test classes, and avoid common pitfalls.
Caching with @Cacheable and Redis in Spring Boot
Guide to using @Cacheable, @CachePut, @CacheEvict with Redis in Spring Boot 3, configuring TTL, JSON serializer, and writing tests with Testcontainers.
Database Migration with Flyway in Spring Boot
Manage database schema with Flyway in Spring Boot 3. This article covers how to write SQL and Java migrations, configuration, testing, and handling common errors.
Securing REST API with Spring Security and JWT
Configure Spring Security with JWT for REST API: issue tokens at login, stateless authentication, role-based authorization, and write tests with MockMvc.
Spring Boot Profiles: dev, test, prod Configuration
Separate configuration and beans by environment (dev, test, prod) using Spring Profiles, activate profiles in multiple ways, write tests with @ActiveProfiles, and avoid common pitfalls.
Calling External APIs with RestClient (Spring Boot 3.2+)
Guide to using RestClient for HTTP API calls: GET/POST, error handling, timeouts, interceptors, HTTP interfaces, and testing with MockRestServiceServer.
Spring Boot Actuator: Health Checks and Metrics
Configure Spring Boot Actuator for health checks, liveness/readiness probes, and metrics with Micrometer, including export to Prometheus.
Configuration with @ConfigurationProperties Instead of @Value
Group configuration into a typed record with @ConfigurationProperties. This guide covers binding complex types, startup validation, IDE metadata, and testing.
Writing Controller Tests with @WebMvcTest and MockMvc
How to use @WebMvcTest, MockMvc, and @MockitoBean to quickly test REST controllers, loading only the web layer, checking JSON, validation, and exception handling.
Centralized Exception Handling with @ControllerAdvice
Guide to using @ControllerAdvice and @ExceptionHandler for centralized error handling, returning standardized responses instead of scattered try-catch blocks across controllers.
Spring Data JPA: Repository, Query Methods, and @Query
Learn how Spring Data JPA auto-generates repositories, naming conventions for query methods, and when to use @Query for precise control over statements.
Creating Your First REST API with Spring Boot
Step-by-step guide to building a REST API for managing Orders with Spring Boot, from project initialization to writing controller tests.
Validation in Spring Boot with Bean Validation
Guide to using Bean Validation in Spring Boot to validate input data, create custom validators, and handle validation errors elegantly for clients.