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Cognitive Technology Team
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Cognitive Technology Team

Cognitive Technology Team regularly delivers the latest IT news, original content, programming tutorials and experience sharing, with daily perks awaiting you.

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Recent Articles

Latest from Cognitive Technology Team

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Cognitive Technology Team
Cognitive Technology Team
Jul 8, 2025 · Backend Development

Why Your Spring @Transactional Doesn’t Rollback: AOP Aspect Order Conflict Explained

An in‑depth analysis of a Spring transaction failure caused by a custom AOP aspect interfering with the default TransactionInterceptor, detailing the symptom, root cause, and step‑by‑step solutions—including adjusting aspect order, rethrowing exceptions, and manual rollback—to ensure reliable transaction management.

AOPAspect PriorityException Handling
0 likes · 8 min read
Why Your Spring @Transactional Doesn’t Rollback: AOP Aspect Order Conflict Explained
Cognitive Technology Team
Cognitive Technology Team
Jul 7, 2025 · Backend Development

Master Spring Bean Scopes: Choose the Right Lifecycle for High‑Performance Apps

An in‑depth guide to Spring Bean scopes explains the seven standard scopes—including Singleton, Prototype, Request, Session, Application, Global Session, and WebSocket—detailing their lifecycles, configuration methods, core principles, and best‑practice scenarios to help developers choose the optimal scope for high‑performance, reliable applications.

Bean ScopeSpringWebSocket
0 likes · 12 min read
Master Spring Bean Scopes: Choose the Right Lifecycle for High‑Performance Apps
Cognitive Technology Team
Cognitive Technology Team
Jul 7, 2025 · Backend Development

Master Automatic Maven Dependency Updates with the Versions Plugin

This tutorial explains how to use the Maven Versions plugin to automate dependency upgrades, integrate them into CI pipelines, handle snapshots, filter unwanted versions, and apply various update goals, providing a reliable and repeatable approach to keep Java projects up‑to‑date.

CIVersions Pluginbuild automation
0 likes · 11 min read
Master Automatic Maven Dependency Updates with the Versions Plugin
Cognitive Technology Team
Cognitive Technology Team
Jul 6, 2025 · Backend Development

Why Spring WebClient Throws OutOfMemoryError and How to Fix It

Upgrading Spring Boot's RestTemplate to the NIO‑based WebClient improves concurrency and performance, but can trigger a java.lang.OutOfMemoryError: Direct buffer memory; this article explains the cause, diagnostic steps using yCrash, and how adjusting -XX:MaxDirectMemorySize resolves the issue.

Java NIOOutOfMemoryErrorSpring Boot
0 likes · 10 min read
Why Spring WebClient Throws OutOfMemoryError and How to Fix It
Cognitive Technology Team
Cognitive Technology Team
Jul 6, 2025 · Fundamentals

Master Maven Dependency Scopes: Optimize Builds and Avoid Conflicts

This guide explains Maven's dependency scopes—including compile, provided, runtime, test, system, and import—detailing their purposes, how they affect transitive dependencies, and offering practical examples and best‑practice recommendations to help Java developers manage builds efficiently and avoid conflicts.

Build ToolsMaven ScopesTransitive Dependencies
0 likes · 14 min read
Master Maven Dependency Scopes: Optimize Builds and Avoid Conflicts
Cognitive Technology Team
Cognitive Technology Team
Jul 6, 2025 · Backend Development

How to Force Maven to Update a Corrupted Local Repository

This tutorial explains why a Maven local repository can become corrupted, demonstrates how to identify broken dependencies, and provides step‑by‑step commands—including -U, dependency:resolve, and purge‑local‑repository—to force Maven to refresh or clean the repository safely.

Force UpdateJava Build Toolslocal repository
0 likes · 8 min read
How to Force Maven to Update a Corrupted Local Repository
Cognitive Technology Team
Cognitive Technology Team
Jul 5, 2025 · Backend Development

Master Maven Dependency Order to Prevent Build Conflicts

This guide explains Maven’s dependency mechanism, including transitive dependencies and mediation, demonstrates ordering problems with Apache POI and OpenCSV, shows how to detect version conflicts using Maven plugins, and provides practical tips to avoid compile‑time and runtime errors in Java projects.

Build ToolsDependency MediationJava
0 likes · 9 min read
Master Maven Dependency Order to Prevent Build Conflicts
Cognitive Technology Team
Cognitive Technology Team
Jul 5, 2025 · Frontend Development

Why Does a POST Request Appear Twice? Unraveling CORS Preflight Mechanics

POST requests can be sent twice in cross‑origin scenarios because browsers issue a CORS preflight OPTIONS request first, and only after the server approves the request does the actual POST occur; understanding same‑origin policy, simple vs complex requests, and proper server header configuration prevents this duplication.

CORSCross-OriginPOST
0 likes · 8 min read
Why Does a POST Request Appear Twice? Unraveling CORS Preflight Mechanics