Focused on Java interview questions and practical article sharing, covering algorithms, databases, Spring Boot, microservices, high concurrency, JVM, Docker containers, and ELK-related knowledge. Looking forward to progressing together with you.
This article walks through the core features of PowerJob, compares it with other Java job schedulers, and provides step‑by‑step instructions for installing, configuring, and creating tasks using both Docker and jar deployments, complete with code samples and UI screenshots.
This article explains the concept of RabbitMQ dead‑letter queues, the three conditions that turn a message into a dead letter, how to configure DLX and routing keys in Spring Boot, common pitfalls, a classic order‑timeout use case, and typical interview follow‑up questions.
The article outlines the evolution from isolated push modules to a unified framework and finally a dedicated push service, detailing functional and non‑functional requirements, component responsibilities, priority handling, and a scalable micro‑service architecture for enterprise notifications.
Hybrid search combines dense vector retrieval with sparse keyword search, using RRF fusion and optional reranking, to overcome the limitations of each method—semantic understanding versus exact matching—making it the production‑grade standard for RAG systems by 2025‑2026.
The article explains why a POST request can result in two HTTP calls by detailing the same‑origin policy, the conditions that make a request simple, and how browsers automatically issue a CORS preflight OPTIONS request before the actual POST.
This article analyzes the rapidly growing demand for IT positions in Chinese banks, categorizes the banks, details typical roles, written tests, interview formats, and provides concrete salary ranges for each institution, offering a comprehensive view of the banking tech job market.
The article explains that fixed-size chunking in Retrieval‑Augmented Generation ignores semantic boundaries, causing broken sentences, scattered topics, redundant or missing information, and noisy retrieval, and it evaluates overlap as a partial fix while presenting better alternatives such as recursive, semantic, structural, and agentic chunking along with practical production tips and future trends.
This article examines three server‑to‑client push methods—polling, WebSocket, and Server‑Sent Events (SSE)—detailing their mechanisms, browser compatibility, pros and cons, suitable scenarios, and provides step‑by‑step demos with Node.js/Express and plain HTML to help developers choose the most efficient solution for real‑time messaging.
This article walks through the motivation, architecture, installation steps, core concepts, and practical usage of integrating the URule visual rule engine into a Spring Boot project, including library files, wizard and script rule sets, decision tables, and a real‑world promotion scenario.
The article breaks down a complete Dubbo RPC invocation into ten precise steps—five on the consumer side and five on the provider side—explaining each core component such as Proxy, Filter, Cluster, LoadBalance, Protocol, and Transport, and addresses common interview follow‑up questions about clustering, load balancing, and sync vs async calls.
