0 views collected around this technical thread.
This article presents ten practical techniques—including built‑in annotations, custom constraints, server‑side checks, internationalized messages, validation groups, cross‑field rules, exception handling, testing, and client‑side considerations—to help developers implement robust validation in Spring Boot applications.
This article introduces a powerful Java parameter‑validation library based on Spring Expression Language, explains its features, supported annotations, usage examples, configuration steps, and how to extend it with custom constraints, providing a complete guide for backend developers.
This article explains how the Spring framework discovers and registers custom annotations by using @ComponentScan, ClassPathScanningCandidateComponentProvider, and TypeFilter mechanisms, guiding developers to configure package scanning, apply meta‑annotations, and optionally implement custom filters for flexible bean management.
This guide explains Spring Validation in Spring Boot 2.6, covering its lightweight features, configuration of Bean Validation providers, injection of validators, practical examples, custom annotation creation, method‑level validation, and additional configuration options with clear code samples.
This article explains how to shift authentication and authorization from the gateway to downstream microservices in a Spring Cloud Alibaba environment by removing the gateway's ReactiveAuthorizationManager, creating three custom annotations (@RequiresLogin, @RequiresPermissions, @RequiresRoles), defining an AOP aspect to enforce them, and demonstrating their usage with Feign calls.
This article provides a comprehensive guide to Java annotations, covering built‑in annotations, meta‑annotations, retention policies, repeatable annotations, and how to create and apply custom annotations with reflection and AOP for practical use cases.
This article explains the purpose and syntax of Java annotations, describes built‑in annotations such as @Override, @Deprecated and @SuppressWarnings, shows how to create and use custom annotations with meta‑annotations, and demonstrates a lightweight testing framework that records annotation‑driven test failures.
This article explains how to shift authentication and authorization from the gateway to downstream Spring Cloud microservices by removing the gateway's ReactiveAuthorizationManager, defining three custom annotations (@RequiresLogin, @RequiresPermissions, @RequiresRoles), creating an AOP aspect to enforce them, and demonstrating their usage in controller methods.
This article provides an in‑depth overview of Java annotations, covering their definition, common applications, built‑in standard annotations, meta‑annotations, functional interfaces, and step‑by‑step instructions for creating and using custom annotations with complete code examples.
This article explains how to create and use custom Java annotations together with Spring AOP to implement unified logging, method‑level parameter validation, and other cross‑cutting concerns, providing practical code examples and best‑practice recommendations for backend developers.
This article walks through creating a lightweight Spring MVC‑like framework by setting up a clean web project, defining custom annotations, implementing a DispatcherServlet that scans packages, instantiates beans, performs dependency injection, maps URLs to controller methods, and finally runs the application without any Spring dependencies.
This article explains how to design and implement custom Java annotations for field validation, permission checks, and caching, covering annotation definitions, target and retention policies, validator classes, interceptor and aspect implementations, and practical usage examples within Spring MVC.
This tutorial walks through creating a miniature Spring MVC framework using only the JDK, covering custom annotations, package scanning, component instantiation, dependency injection, URL mapping, and a custom DispatcherServlet, with complete code structure and runtime demonstration.