This article explains what Spring MVC interceptors are, when to use them, provides a simple implementation and registration example, and then dives into advanced patterns such as MappedInterceptor, global interceptors, and asynchronous interceptors with complete code snippets and usage guidance.
This article demonstrates multiple ways to handle file uploads in Spring Boot 3, covering basic @RequestParam usage, Map and object binding, jakarta.servlet.http.Part, and @RequestPart for combined JSON and file data, complete with code snippets and practical examples.
This article provides a comprehensive guide to data validation in Spring Boot 3, covering Bean Validation annotations, controller and service‑layer checks, JPA entity validation, custom constraints, validation groups, programmatic validation, and internationalized error messages with practical code examples and tests.
This article explains how SpringBoot interceptors work, demonstrates custom interceptor implementation, shows how misuse of ThreadLocal can cause memory leaks and OOM errors, and provides a fix by moving cleanup logic to afterCompletion, complete with code samples and performance screenshots.
This guide explains how to customize Spring Boot's default error handling—including enabling RFC‑7807 problem details, extending BasicErrorController, using @ControllerAdvice for JSON responses, creating custom HTML error pages, and registering error pages directly with the embedded servlet container.
This comprehensive guide explains the most commonly used Spring Boot annotations—including MVC mapping, bean definitions, dependency injection, scope management, container configuration, and bootstrapping—providing clear examples and visual diagrams to help developers write cleaner, more efficient Java code.
This article explains how Spring MVC processes HTTP 400 errors, walks through the DispatchServlet and exception‑handling flow, shows key code snippets, and provides practical ways to implement global or custom exception resolvers to handle common 400‑causing exceptions.
This article provides a comprehensive overview of common Spring Boot annotations, including @SpringBootApplication, @RestController, @RequestMapping, and JPA annotations, explaining their purposes, usage, and example code snippets for building Java backend applications effectively.
