Official JD technology sharing platform. All the cutting‑edge JD tech, innovative insights, and open‑source solutions you’re looking for, all in one place.
This article explains why consistent Java code style matters, reviews major industry style guides, shows how to choose and customize a style guide, and provides step‑by‑step instructions for configuring IntelliJ IDEA, Checkstyle, and Maven to enforce the standards in daily development.
This article presents a comprehensive study of generative retrieval for large‑scale e‑commerce search, comparing lexical‑based and Semantic‑ID‑based methods, introducing a Query‑to‑MultiSpan framework, analyzing the sand‑glass distribution problem in residual quantization, and proposing heuristic and adaptive solutions to improve recall and efficiency.
This article explains how multi‑table joins in MySQL can become performance bottlenecks and walks through the four join algorithms—Simple Nested‑Loop, Block Nested‑Loop, Hash, and Index Nested‑Loop—showing their execution plans, code examples, and step‑by‑step optimizations using indexes and join buffers to dramatically improve query speed.
This article details how a SpringBoot advertising platform service with startup times of 400‑500 seconds was analyzed and optimized through Actuator monitoring, log inspection, Tomcat TLD scan disabling, asynchronous HBase warm‑up, custom BeanPostProcessors, async JSF consumer initialization, Tomcat version tuning, and hardware upgrades, achieving roughly a 60% reduction in launch time.
This article explains how Taro converts standard W3C CSS into HarmonyOS ArkUI styles, addressing unit and layout differences, using a Rust‑based LightningCSS plugin and the Yoga layout engine, and detailing the full style initialization, matching, application, and update workflow for cross‑platform React development.
This article presents a detailed, step‑by‑step guide on improving unit test coverage in large Java codebases, covering strategies such as mocking, divide‑and‑conquer, tool‑assisted test generation, reflection‑based coverage, Maven configuration, and practical tips for handling static methods, final classes, and test data replay.
This article shares a series of B‑side experience design case studies—including a digital keypad for streamlined data entry, task tip cards for instant guidance, floating cards to reduce navigation, and innovative data‑visualization components—illustrating how thoughtful interaction design can boost efficiency, reduce user friction, and foster a seamless product‑user rapport.
This article shares a recent graduate's journey into backend development at JD, offering practical advice for newcomers, detailing a large‑scale system refactor using domain‑driven design, discussing the creation of an AI‑powered merchant assistant, and emphasizing continuous learning and professional growth.
This article discusses how to write clean, maintainable Java methods by covering proper method signatures, limiting parameters, avoiding varargs misuse, validating inputs, minimizing side effects, handling exceptions correctly, writing concise method bodies, and providing effective logging and documentation practices.
The paper proposes a multimodal Reliable Feedback Network (RFNet) and a consistency‑regularized fine‑tuning method (RFFT) that dramatically increase the proportion of usable advertising images generated by diffusion models while preserving visual appeal, and introduces the large‑scale RF1M dataset for training and evaluation.
