Full-stack Java development with Vue 2/3 front-end suite; hands-on examples and source code analysis for Spring, Spring Boot 2/3, and Spring Cloud.
This article walks through building a Spring Boot 3.5.0 service that uses Apache POI and XDocReport to load a DOCX file, extract images, convert it to HTML, and expose a controller endpoint for instant online preview without external plugins.
This article walks through Spring Boot 3.5.0’s URI building tools—including UriComponents, UriBuilderFactory, encoding options, ServletUriComponentsBuilder, and MVC link generation—showing how to construct correct, automatically‑encoded URLs for RestTemplate, WebClient, and controller methods with concrete code examples and outputs.
This article introduces Retrieval‑Augmented Generation (RAG) and systematically details nine distinct RAG architectures—standard, conversational with memory, corrective (CRAG), adaptive, self‑RAG, fusion, HyDE, agentic, and Graph RAG—highlighting their workflows, real‑world examples, advantages, and trade‑offs.
The article explains how standard Spring Boot controller‑level validation leaves service methods unchecked, and demonstrates using @Validated with MethodValidationPostProcessor, custom exception handling, and a MethodValidationExcludeFilter to apply, convert, and selectively disable validation across the application.
The article examines five high‑frequency Spring Boot anti‑patterns—field injection, returning entities from controllers, overusing @Transactional, generic exception handling, and embedding business logic in controllers—showing problematic code snippets, real‑world consequences, and concise refactored examples to improve testability, performance, and maintainability.
This article explains three Spring Boot 3.5.0 techniques—ResponseBodyEmitter, SseEmitter, and StreamingResponseBody—for delivering multiple asynchronous values as a stream, complete with code samples, curl demonstrations, and a front‑end EventSource example.
This article demonstrates how to add a single @Monitor annotation to Spring Boot 3.5.0 services and automatically obtain call‑trace and execution‑time metrics by leveraging Spring AOP, SimpleTraceInterceptor, PerformanceMonitorInterceptor, custom advisors, and a BeanPostProcessor, with full code examples and a test controller.
The article dissects how the default JpaRepository findById method can trigger unnecessary SELECT queries, create foreign‑key violations under concurrency, and degrade performance, then demonstrates three concrete workarounds—including getReferenceById, manual entity construction, and pessimistic read locking—to eliminate these issues.
This article demonstrates seven practical ways to access configuration properties in a Spring Boot 3.5.0 application, covering ContextRefreshedEvent listeners, ConfigurableEnvironment, the Environment interface, @Value, @ConfigurationProperties, ConfigurableBeanFactory, and the Actuator /env endpoint, each with code examples and usage notes.
This article demonstrates how to create a millisecond‑level real‑time online user tracking system using Spring Boot 3.5, WebSocket with STOMP, and Redis pub/sub, covering environment setup, Maven dependencies, server‑side configuration, presence services, event listeners, and a simple front‑end page.
