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This guide explains how to reliably identify and remove existing watermarks from .xlsx files and then add new, precisely positioned semi‑transparent watermarks using Java's Apache POI library, complete with Maven setup, code examples, and performance tips.
This article explains why certain machines fail to refresh configuration with @RefreshScope in a Spring Cloud Alibaba and Nacos setup, analyzes the underlying source code, identifies five common root causes, and provides a step‑by‑step troubleshooting guide with best‑practice recommendations.
A real‑world incident at JD Tech shows that a single 1.5 MB Redis cache key caused a full‑site outage during a high‑traffic event, and the article explains the underlying cache‑breakdown and bandwidth traps, then details three emergency mitigations and long‑term preventive practices.
Leveraging AI and natural language processing, Tmall’s quality assurance team transformed traditional manual testing into a semi‑automated and fully automated pipeline—covering requirement analysis, test case generation, data construction, execution, and validation—resulting in significant efficiency gains, traceability, and continuous improvement across multiple business lines.
This article outlines five core software design principles—product‑first, natural‑language interaction, iterative feedback, context management, and simplicity—that help developers harness AI‑driven Vibe Coding while avoiding technical debt and ensuring long‑term maintainability.
This tutorial introduces Java Diff Utils, a lightweight open-source library for computing text differences, showing how to set it up in a Spring Boot project, compare string lists, generate unified diffs, apply patches, and create side-by-side visualizations for robust version-control and change-tracking in Java applications.
Learn how to tame chaotic microservices with practical resilience patterns—circuit breakers, bulkheads, smart retries, timeouts with fallbacks, and event‑driven messaging—plus tool recommendations and observability tips that ensure your system stays responsive even when individual services fail.
This article explains how Java 24 and OpenJDK introduce HTTP/3 via JEP 517, describes the QUIC protocol that powers it, compares performance against HTTP/2, and provides Java benchmark code showing reduced latency and fewer TCP connections when using HTTP/3.
This article explains how Java 24 and OpenJDK add HTTP/3 support, compares its speed to HTTP/2 using benchmark code, and shows why the QUIC‑based protocol delivers lower latency and fewer TCP connections for modern web applications.
This article deeply explores Kafka consumer group rebalance mechanisms, identifies performance pitfalls of frequent rebalances, and provides a comprehensive set of configuration tweaks, assignment strategies, batch processing techniques, and monitoring practices to achieve a more stable and high‑throughput Kafka consumer system.
