Recently, I integrated Google OAuth login functionality into a project and encountered numerous pitfalls from configuration to deployment. I’ve organized my experience into this article, hoping it will help other developers facing similar challenges. 🎯 Project Background 📋 Complete Configuration Process Step 1: Detailed Configuration in Google Cloud Console This is the first and most…

Tired of users spamming buttons and causing duplicate submissions—like 5 identical orders cluttering your database or 2 AM emergency rollbacks? This guide breaks down how to build a full anti-duplicate system with Spring Boot, from simple local locks for single servers to Redis distributed locks for clusters. Packed with practical code snippets, pitfall warnings, and…

This article details the “interrupt service routine variable not updating” issue in embedded ARM development, which stems from compiler optimization and missing volatile modifiers. It uses examples to explain errors caused by compiler “redundant load elimination”, illustrates how the volatile keyword prohibits register caching and maintains instruction order, and compares optimization differences at the ARM…

Apple’s iOS 26 software update for iPhones is available Monday to people who have an iPhone 11, iPhone SE 2, and later. The marquee feature of iOS 26 is Apple’s Liquid Glass design, which includes elements on-screen that resembled a“glassy”look. Other features include a call screening assistant, a new gaming and preview app, in-app translation across…

This article provides a detailed solution to the “com.mongodb.MongoSocketOpenException: Connection refused” error that occurs when starting a Spring Boot project—even without any MongoDB configuration. It explains why the mongodb-driver-sync dependency triggers auto-configuration and offers two methods to disable MongoAutoConfiguration, helping developers quickly troubleshoot similar issues. 1. Background & Environment Overview To meet business requirements, a…

With Tesla shareholders set to vote on a proposed 10-year, $1 trillion compensation package for CEO Elon Musk in November, board chair Robyn Denholm spoke to The New York Times to defend what would be the largest pay package in corporate history. Denholm, who was also on the special committee that put the compensation proposal together, argued that…

Wondering why Python lists can resize automatically? Why is append() fast but insert(0) slow? Starting from the C source code of CPython, this article disassembles core structures such as PyObject and PyListObject, analyzes underlying functions like list_resize() and list_append(), and completely reveals the static array essence of dynamic lists. It helps Python developers understand the…

Apple on Tuesday announced its iPhone 17 lineup, which consists of the iPhone 17, iPhone 17 Air, iPhone 17 Pro, and iPhone 17 Pro Max. All four of the devices will be available to preorder on Friday and will be available on September 19. iPhone 17 and iPhone 17 Air Differential specs Common specs The iPhone will…

A complete guide to UART serial communication: Learn underlying principles, protocol parsing with state machines, ECharts visualization, and fix garble/loss. Ideal for embedded & IoT engineers. As one of the most fundamental communication methods in embedded systems and the Internet of Things (IoT), serial communication (UART) is a core technology that every hardware/software engineer must…

Apple is hosting its“Awe dropping”hardware event tomorrow at 10 a.m. PT. The company is expected to announce its iPhone 17 lineup, which could include a slimmer version, as well as updates for the Apple Watch and AirPods.  The keynote will take place at Apple Park in Cupertino. Viewers can tune in to the livestream here or watch it…