Sharing computer programming language knowledge, focusing on Java fundamentals, data structures, related tools, Spring Cloud, IntelliJ IDEA... Book giveaways, red‑packet rewards and other perks await!
This article analyzes how GraalVM Native Image 23.0 and Spring Boot 3.5 enable millisecond cold starts, 80% smaller containers, and production-ready serverless Java across AWS, Alibaba Cloud, Tencent Cloud, and Azure — with benchmarks, migration steps, and pitfall solutions.
The author shares practical experience replacing OpenFeign with Spring's @HttpExchange during a Spring Boot 4 upgrade, demonstrating configuration simplification, authentication handling via RestClient interceptors, error mapping with defaultStatusHandler, and the decision to coexist both clients rather than force a full migration.
The article debunks the myth that try-catch hurts Java performance by analyzing JVM exception tables, bytecode, and running benchmarks under interpreted and compiled modes, showing negligible overhead when no exception is thrown and that JIT compilation eliminates even minor goto costs.
This article explains why EasyExcel was archived, introduces FastExcel as a rewrite, details its donation to Apache as Fesod, provides migration steps with code examples, compares performance against alternatives, and recommends Apache Fesod for new and existing projects due to its streaming API, low GC overhead, and Apache Foundation backing.
The article analyzes why Java virtual threads, despite promising million-concurrency with minimal code changes, see little production adoption due to pinning with synchronized, ThreadLocal memory pressure, incomplete framework support, and CPU-bound workload mismatch, while showing benchmarks where they excel in I/O-heavy services but migration costs deter legacy systems.
This article analyzes why Sa-Token has surpassed 46K GitHub stars by comparing its Core-Plugin-Adapter architecture, zero-config startup, and one-line authentication API against Spring Security's steep learning curve, demonstrating how it reduces permission system implementation from weeks to days.
This article explains why companies enforce git rebase for feature branches instead of merge, showing how merge creates noisy history that breaks git bisect and blame, while rebase produces a linear, readable log that speeds up code review and bug hunting — with safe workflow commands and conflict-handling tips.
Days before JDK 27's scheduled release, OpenJDK developers emergency-reverted a P1-level C2 compiler intrinsic memory alias bug (JDK-8390590) that caused incorrect optimization of EncodeISOArray, choosing a clean backout over risky patching to ensure release stability.
The article walks through a complete Spring Boot implementation of WeChat‑like message recall, explaining why a simple DELETE is insufficient and detailing how to use a status flag, conditional UPDATE, WebSocket, Redis/MQ, and multi‑device session management to synchronize recall across all clients, even under concurrency and offline scenarios.
This guide explains how Claude Code’s powerful automation can unintentionally run risky commands and shows how to use Hooks—configurable event‑driven scripts—to enforce safety checks, format code, send notifications, and debug issues across the Claude Code workflow.
