Freaks City

Environment Setup JDK version: 17 Build tool: Gradle Spring Boot version: 2.7.18 (Note: Spring Boot 3 introduces significant changes) Spring Security version: 5.7.11 Core Components and Authentication Flow Spring Security implements authentication and authorization through a chain of filters. Each filter has a specific responsibility, and onl ...

System Overview This project outlines the architecture and implementation of a second-hand trading platform designed specifically for campus environments. The system utilizes a WeChat Mini Program for the client interface, ensuring easy access for students without additional installations. The backend is powered by Spring Boot, providing a robu ...

Spring Boot operates as an opinionated extension of the broader Spring ecosystem, engineered to eliminate boilerplate setup for enterprise-grade Java applications. By leveraging convention-over-configuration principles, it accelerates the transition from prototype to production deployment. Architectural Pillars The framework relies on several f ...

Introduction Feign simplifies REST client development by abstracting away the underlying HTTP communication details. Instead of manually constructing URLs, handling parameter concatenation, and managing HTTP requests, Feign allows developers to define service calls as simple interface methods that resemble Spring MVC controller endpoints. This ...

Overview Thymeleaf is a modern server-side Java template engine that processes HTML, XML, JavaScript, CSS, and plain text. Unlike traditional templating engines, Thymeleaf can process templates in both web and non-web environments. It uses natural templates that function as static prototypes, enabling seamless collaboration between designers an ...

SSH Authentication Setup Establishing a secure connection between the application server and the remote Git repository requires SSH key authentication. Generate a dedicated key pair for the deployment environment: ssh-keygen -t rsa -b 4096 -f ~/.ssh/magic_api_deploy -N "" Register the public key (~/.ssh/magic_api_deploy.pub) within t ...

Creating a dish with associated flavor options requires coordinated writes across two database tables: dish and dish_flavor. To preserve data integrity, these operations must execute as a single atomic unit—either all succeed or none do. This is achieved using Spring’s declarative transaction management. The service layer method responsible for ...

Problem Description The error originates during request processing in a Spring Boot aplpication: org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'timestamp' cannot be found on object of type 'java.util.HashMap' - maybe not public? This happens when Spring attempts to evaluate expressions in error handli ...

In the previous article, we explored Spring Boot integration with Redis. This article focuses on implementing Redis caching in MyBatis operations. We'll examine four key annotations: @CachePut, @Cacheable, @CacheEvict, and @CacheConfig. Fundamentals @Cacheable The @Cacheable annotation configures method-level caching, storing results based on m ...

System Architecture Overview A digital campus auction platform requires a strict separation between client-side rendering, backend service orchestration, and relational data persistence. The implementation utilizes Spring Boot for RESTful API delivery, Vue.js for a reactive single-page application frontend, and MySQL to maintain transactional i ...