Freaks City

Backend Development Framework Architecture Overview: Client sends HTTP request to Controller layer Controller receives the request and passes data to Service layer Service layer handles business logic, may interact with DAO layer for database operations or Client layer for remote service calls DAO layer executes database operations and returns ...

Internal Configuration Resolution Order File-name precedence bootstrap.yml (or bootstrap.properties) is processed before any application.* file. application.yml (or application.properties) is processed next. Directory precedence (highest → lowest) ./config/ – a config folder in the project root ./ – the project root itself classpath:/config/ ...

When tasked with enriching a dataset of IP addresses with geographic metadata—such as country, province, and city—the priority is rapid, reliable execution. This scenario involved processing several hundred IP records stored in a Excel file, converting them to CSV for simplicity, then calling an external geolocation API to append loccation deta ...

Database connection pooling is a foundational optimization in modern Java applications, especially within Spring Boot ecosystems. Misconfigurations or misunderstandings of pool behavior frequently lead to subtle production issues — such as stale connections, timeouts, or resource exhaustion — even among seasoned developers. Why Connection Pools ...

Project Dependencies To begin, configure the pom.xml file with the necessary dependencies for Spring Boot, MongoDB integration, and Lombok to reduce boilerplate code. <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0"> <modelVersion>4.0.0</modelVersion ...

User Table Structure The original table structure is designed as follows. Due to the large user base, database sharding becomes necessary. Sharding Strategy Design Based on the system design assumptions, the 12306 system needs to support approximately 1 billion registered users, with roughly 10 million new users annually. Before implementing da ...

Global exception handling in Spring Boot allows centralized management of errors across the application layer. The typical implementation involves a configuration class annotated with @ControllerAdvice, where methods are marked using @ExceptionHandler to specify target error types. @Component @Order(2) public class GlobalErrorConfig { @Exc ...

Introduction This cinema ticket booking system is built using Java with the SSM framework and JSP technology. The system provides comprehensive functionality for managing movie screenings, ticket sales, and user accounts. System Architecture Backend Framework SpringBoot Spring Boot serves as the foundation for building stand-alone, production-r ...

Before diving into the code, ensure your Elasticsearch server is running. Open a terminal and execute the elasticsearch command to start the server. Understanding the Two REST Client Types Elasticsearch provides two distinct REST client implementations: High-Level REST Client (RestHighLevelClient): This wrapper handles serialization and deseria ...

Overview Aspect-Oriented Programming enables modular handling of cross-cutting concerns. This guide demonstrates implementing automatic encryption and decryption for controller layer data using Spring Boot AOP, allowing business logic to remain clean while security concerns are handled transparently. Core Concepts AOP terminology includes: Asp ...