Official JD Tech public account delivering best practices and technology innovation.
This article outlines the motivations, challenges, and step‑by‑step solutions for migrating over 100 Java applications to JDK 21, covering dependency conflicts, module system adjustments, Maven plugin compatibility, garbage‑collector selection, and practical build and deployment practices to ensure a smooth upgrade.
The article introduces Taro's open-source C-API version for HarmonyOS, detailing its architecture, rich component and CSS support, high-performance rendering, hybrid native integration, and step‑by‑step installation guide, positioning it as a leading frontend solution for cross‑platform development.
This article recounts how JD Retail's young algorithm engineers tackled diverse AI problems—optimizing reward‑model ensembles for ad image generation, building large‑language‑model‑based query expansion, and pruning diffusion models with FFT and RDP—while sharing their technical approaches, code snippets, and growth reflections.
This article provides a comprehensive overview of front‑end technology stacks—including native app development, web frameworks, mini‑programs, and cross‑platform solutions—alongside common network libraries, the full HTTP request lifecycle, and practical performance optimization techniques for speed, weak‑network resilience, and security across native, web, and mini‑program environments.
The article recounts Xiaoting’s journey from a PhD research background to leading JD.com’s ad‑fraud detection, detailing how large language models, reinforcement learning, and model distillation were applied to identify hidden address codes, reduce false‑positive rates to 0.3%, and balance accuracy with real‑time performance in a high‑traffic e‑commerce environment.
This article explains the Aho‑Corasick automaton, a classic multi‑pattern matching algorithm that builds a Trie with fail pointers to achieve linear‑time search over massive keyword sets, and demonstrates a Java implementation for highlighting keywords in HTML documents.
This article explains why consistent Java code style matters, reviews major industry standards such as Google and Alibaba, guides the selection and customization of a style guide, and demonstrates how to configure IntelliJ IDEA, Checkstyle, and Maven to enforce the rules throughout development.
This article provides an in‑depth analysis of the Java ConcurrentHashMap implementation, covering its constructor logic, hash‑table sizing, the core put and get operations, element counting with addCount, multi‑threaded resizing via transfer, treeification of bins, removal, computeIfAbsent, and the design choices that forbid null keys and values to simplify concurrency handling.
This article provides a comprehensive overview of Sentinel, covering its core concepts, flow‑control and circuit‑breaker capabilities, extensible rule engine, dashboard interaction, source package structure, and practical deployment considerations for Java‑based cloud‑native microservices.
The article introduces intelligent supply chain planning algorithms—including network design, inventory layout, and simulation—detailing their optimization models, high‑performance solving techniques, and real‑world impact on cost reduction, efficiency, and service experience across large‑scale logistics operations.
