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Lin is Dream
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Lin is Dream

Sharing Java developer knowledge, practical articles, and continuous insights into computer engineering.

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Recent Articles

Latest from Lin is Dream

95 recent articles
Lin is Dream
Lin is Dream
May 30, 2025 · Backend Development

What’s the Real Difference Between NGINX keepalive and HTTP keep‑alive?

Explain that “keepalive” is a concept used in both NGINX and HTTP protocol but with different meanings. In HTTP, keep‑alive (or persistent connection) is a header that allows a TCP connection to be reused for multiple requests, reducing latency. In NGINX, keepalive refers to the connection‑pool settings for upstream servers, controlling how many persistent connections are kept and their timeout.

HTTPKeepalivePerformance
0 likes · 8 min read
What’s the Real Difference Between NGINX keepalive and HTTP keep‑alive?
Lin is Dream
Lin is Dream
May 29, 2025 · Operations

Why Should You Install Software as Root but Run It as a Non‑Root User?

The article explains that software on a server should be installed using the root account to place executables in system directories, while the actual processes should run under a non‑root user to limit privileges, and provides practical tips for configuring file permissions and avoiding security risks.

Non-rootPermissionsRoot
0 likes · 4 min read
Why Should You Install Software as Root but Run It as a Non‑Root User?
Lin is Dream
Lin is Dream
May 28, 2025 · Backend Development

Mastering Uniform Date Formatting in Spring Boot with Jackson

This guide shows how to configure Jackson in Spring Boot to consistently format LocalDateTime, Date, and String parameters as "yyyy-MM-dd HH:mm:ss", covering global settings via application properties, field-level @JsonFormat, custom serializers/deserializers, and unified handling in REST controllers.

Date FormattingJSONJava
0 likes · 8 min read
Mastering Uniform Date Formatting in Spring Boot with Jackson
Lin is Dream
Lin is Dream
May 27, 2025 · Backend Development

Master Maven: Essential Tips for Java Backend Projects

This guide walks you through Maven installation, local repository configuration, dependency coordinates, common Maven commands, profile usage, multi‑module project setup, the difference between dependencyManagement and dependencies, and practical Maven tricks such as installing local jars, removing version numbers from generated artifacts, and resolving dependency conflicts.

Build ToolsJavadependency management
0 likes · 11 min read
Master Maven: Essential Tips for Java Backend Projects
Lin is Dream
Lin is Dream
May 27, 2025 · Backend Development

Master Maven Mirrors: Configure Repositories, Mirrors, and Private Deployments

This guide explains how Maven repositories and mirrors work, the role of the mirrorOf attribute, how to set up central and third‑party repositories in pom.xml, configure mirrors in settings.xml with various matching rules, and properly configure private repository deployment with authentication and profile activation.

BuildJavaMirror
0 likes · 7 min read
Master Maven Mirrors: Configure Repositories, Mirrors, and Private Deployments
Lin is Dream
Lin is Dream
May 26, 2025 · Backend Development

Master Java Date & Time APIs: Quick Reference for Daily, Weekly, Monthly and Quarterly Operations

This article consolidates essential Java date and time utilities—including start/end calculations for days, weeks, months, quarters and years, time arithmetic, formatting, parsing, and conversions between LocalDateTime, Date, and Instant—providing a handy reference for developers working with the Java Time API.

DurationJavaLocalDateTime
0 likes · 15 min read
Master Java Date & Time APIs: Quick Reference for Daily, Weekly, Monthly and Quarterly Operations
Lin is Dream
Lin is Dream
May 26, 2025 · Fundamentals

Why Time Bugs Threaten Software: From Y2K to the 2038 Problem

This article explores how time is represented in computers, explains historic bugs like the Y2K and the upcoming 2038 issue, clarifies GMT/UTC, time zones and daylight saving, and compares 32‑bit and 64‑bit timestamps, Java long handling, and architectural differences that affect time calculations.

2038 problem32-bit vs 64-bitJava long
0 likes · 12 min read
Why Time Bugs Threaten Software: From Y2K to the 2038 Problem
Lin is Dream
Lin is Dream
May 25, 2025 · Databases

Master MySQL Row-to-Column Pivot: From Basics to Advanced Aggregations

This article walks through using MySQL to pivot rows into columns, covering storage concepts, practical CASE‑WHEN aggregation techniques, and detailed SQL examples for sum, count, average and max calculations, while also discussing performance considerations for medium‑scale and large‑scale data workloads.

Data WarehouseMySQLOLAP
0 likes · 7 min read
Master MySQL Row-to-Column Pivot: From Basics to Advanced Aggregations
Lin is Dream
Lin is Dream
May 23, 2025 · Information Security

ZeroNews Review: Free Multi‑Protocol Intranet Tunneling Without a Public IP

This article introduces ZeroNews, a cloud‑based intranet‑penetration service that supports HTTP, HTTPS, TCP and UDP, explains how to register, obtain a token, install the client on various platforms, configure mappings, and compares its pros, cons, and features against ngrok, frp and Cloudflare Tunnel.

DevOpsZeroNewscloud services
0 likes · 7 min read
ZeroNews Review: Free Multi‑Protocol Intranet Tunneling Without a Public IP