Spring Boot — convention-over-configuration framework for building Spring-based Java applications
Spring Framework 7 now ships @Retryable and @ConcurrencyLimit in core. Here's what's still Resilience4j's job on Boot 4.1 -- circuit breaker, rate limiter, bounded-wait bulkhead, fallbacks, and dashboards -- plus two build breaks you'll hit getting there.
ETag cache control in a Spring Boot REST API, re-verified on Spring Boot 4.1.1 and Spring Framework 7.0.9: the zero-code ShallowEtagHeaderFilter, deep caching with WebRequest.checkNotModified(), conditional PUT with If-Match, and strong vs weak ETags.
Learn how to add HTTP Basic Auth, JWT Bearer tokens, and role-based access control to Jersey JAX-RS REST APIs. Covers ContainerRequestFilter, SecurityContext, annotations, and Spring Boot integration with annotated Java code.
Build a custom Maven archetype from scratch: create the descriptor, add Velocity-templated source files, install locally, generate a new Spring Boot project from it, and deploy to a team-shared repository. Step-by-step with working code.
A practical deep dive into Java Message Service (JMS): core concepts, queue vs topic messaging, synchronous and asynchronous consumers, publish-subscribe with Apache ActiveMQ, Spring Boot JmsTemplate, and production best practices.
Master Logback RollingFileAppender with time-based, size-and-time, and fixed-window rolling policies. Includes production-ready logback.xml examples, Spring Boot integration, async logging, and a complete FAQ.
A complete beginner's guide to building a REST API with Spring Boot 3. Covers project setup, clean package structure, a Java record model with Bean Validation, a service layer, a @RestController with GET/POST/PUT/DELETE endpoints, global exception handling with @RestControllerAdvice, and end-to-end curl testing u2014 with fully annotated code throughout.
A complete guide to testing microservices with JUnit 6: single-service integration tests with WireMock, consumer-driven contract tests with Spring Cloud Contract, and end-to-end tests with Docker Compose and Testcontainers. Covers async event testing and state management strategies.
A complete guide to testing REST APIs with JUnit 6 using both MockMvc and WebTestClient. Covers GET, POST, PUT, DELETE testing, JSON path assertions, validation error testing, file uploads, authentication, and a matcher quick-reference table.
A complete guide to testing Spring Boot applications with JUnit 6. Covers unit tests with plain JUnit, slice tests (@WebMvcTest, @DataJpaTest, @JsonTest), full integration tests with @SpringBootTest, context caching, Testcontainers, and best practices for each layer.