This article explains why and how to deliberately throw exceptions during Spring Boot development to test transaction rollbacks and global error handling, comparing a manual approach with IntelliJ IDEA's built‑in "Throw Exception" debugging feature.
This guide explains how IntelliJ IDEA’s Reset Frame (or Drop Frame in older versions) lets you roll back to a previous stack frame during Java debugging, shows when it works, provides code examples, and clarifies version differences.
Ephemeral containers are temporary debugging pods in Kubernetes that lack resource guarantees and cannot restart automatically; this guide explains their differences, enabling the feature via kube-apiserver and kubelet flags, creating a sample Tomcat pod, adding an Ephemeral container with kubectl debug, and updating it using raw API calls.
This article investigates a Node.js V8 heap snapshot crash, tracing the segmentation fault to a faulty context extension slot, detailing the assembly analysis, reproducing the issue, and presenting a backported fix for Node‑v14.
This article recounts a series of real‑world challenges—including Excel‑to‑SQL imports, temporary table handling, Canal service failures, jar conflicts, and deployment mistakes—and explains the step‑by‑step solutions that restored system stability and delivered the required data to operations.
This article introduces the Jump To Line plugin for IntelliJ IDEA, explaining how installing it adds a draggable yellow arrow during debugging that lets you instantly jump execution to any line of code, dramatically improving debugging efficiency.
This article explores the precise moment a Spring @Transactional transaction is committed relative to a surrounding lock release, revealing that commits occur after the method finishes, and demonstrates how to verify this through source code inspection, debugging techniques, and proper lock‑usage to prevent overselling.
This article walks through three frontend case studies: capturing and reporting resource‑load errors and slow assets with global listeners and performance APIs, centralizing z‑index handling to prevent stacking‑context chaos, and demonstrating how a CSS transform on an ancestor changes the behavior and layering of position:fixed elements.
This article walks you through VS Code's workspace configuration, covering the .vscode folder, settings.json, tasks.json, and launch.json, with step‑by‑step instructions, code examples, and tips for customizing editor appearance, task automation, and debugging across platforms.
A customer’s Spark card queries were consistently taking around 10 seconds, prompting a step‑by‑step investigation that revealed a misconfigured NAS mount option (lookupcache=none) as the root cause of the severe slowdown.
This article explains the causes of Android ANR, details the input dispatching mechanism, presents key code paths in InputDispatcher, and provides a step‑by‑step analysis workflow—including system‑level factors, stack inspection, Binder problems, and memory‑related pitfalls—to help developers diagnose and resolve most ANR cases.
This article walks through a puzzling Python list loop that produces no output, explains why the loop stops early, shows annotated code examples, and presents a second variant of the problem with detailed step‑by‑step analysis to help readers avoid similar bugs.
This article walks through three frequent Selenium‑Python automation problems—missing test discovery due to method naming, incorrect URLs that break page data loading, and element‑location failures after window switches—explaining their causes and step‑by‑step solutions.
The author, a veteran C/C++ developer, reflects on two months of using Rust, highlighting how Rust's compile‑time safety checks address common memory problems of C languages, the challenges of reproducing runtime bugs, and the trade‑off between longer compile times and more reliable software.
This article explains how to modify Spring's @Async annotation so that its value attribute can resolve placeholders or SpEL expressions, demonstrates a working demo, shows the required code changes using EmbeddedValueResolver, and shares debugging tricks and related Java language features.
The article shows how to diagnose the Android 6.0+ TextView marquee jump caused by a button’s setText triggering requestLayout and onMeasure, and fixes it by giving the button a fixed size instead of wrap_content, illustrating a systematic source‑code analysis and debugging workflow for UI issues.
After the user center’s test environment repeatedly halted all database requests, we traced the issue to Druid’s connection pool threads blocking on takeLast(), discovered opentelemetry’s global lock causing deadlock, and resolved it by upgrading Druid and adjusting maxWait settings.
This article analyzes why Linux reports "fork: cannot allocate memory" when the real issue is an excessive number of threads or PID allocation failures, explains the kernel's do_fork and alloc_pid implementations, and offers guidance for diagnosing and fixing such misleading ENOMEM errors.
This article explains what source maps are, how they map compressed JavaScript back to original source files, the structure and version history of source map files, and provides practical examples and code snippets to help developers debug minified code effectively.
This article explains practical Java debugging tricks such as setting conditional breakpoints, using Drop Frame to revisit previous execution points, handling multithreaded breakpoints, configuring remote debugging, and evaluating or modifying expressions on the fly to streamline development and troubleshooting.
This tutorial shows how to set up VS Code for Go debugging with Delve, explains the toolbar icons for controlling execution, demonstrates inspecting variables and using conditional breakpoints, and describes using the call‑stack window to trace function calls and efficiently locate bugs.
This article explains why a WeChat mini‑program’s share card lost its QR code due to incorrect assumptions about Object.keys ordering, dives into the ECMAScript specification and V8’s internal property storage, and shows how to modify wxml2canvas to correctly sort elements and avoid the bug.
The article outlines how MNN Workbench, Alibaba’s open‑source edge‑AI platform, integrates professional training capabilities, cloud‑based PAI‑DLC resources, multi‑window debugging, and visual Git Flow to streamline end‑to‑end model development, deployment, and iteration for developers of varying expertise.
This article presents a thorough Java production troubleshooting workflow, covering essential knowledge, tools, and data analysis techniques, with detailed explanations of JVM garbage collection, profiling utilities, and real‑world case studies to help engineers quickly locate and resolve performance and stability problems.
This article explains the fundamentals of Vue server‑side rendering, why hydration is needed, the scenarios where it should be used, the typical reasons hydration can fail, and practical steps to diagnose and resolve those failures for more stable frontend applications.
This article details Alibaba’s experience building and deploying Flutter‑Web pages for the ICBU seller platform, covering version selection, code reuse, build optimization, deployment workflow, debugging, native JS integration, performance tuning, and compatibility fixes across various H5 containers.
This article introduces four powerful IntelliJ IDEA debugging techniques—log evaluation at breakpoints, field breakpoints, exception breakpoints, and method breakpoints—providing step‑by‑step instructions, code examples, and screenshots to help Java developers debug more efficiently without cluttering their code with temporary prints.
This step‑by‑step guide shows how to hook cookies in the browser, locate and export the encrypted jsrpc function, start a local ws service, register actions, and use Python requests to automate data retrieval from a target site.
A fatal UC kernel crash on Android 12, triggered by a hidden VerifyError during class verification, was dissected through log analysis, runtime thread inspection, and clever code‑injection tricks, ultimately resolved by preventing background verification via a core.jar symlink workaround.
This guide explains frequently confused Python operations, compares Python idioms with C/C++ conventions, introduces essential standard‑library tools, and offers performance‑oriented debugging techniques to help developers write cleaner, faster, and more reliable Python code.
This article explains the challenges of debugging Serverless applications, introduces the innovative End‑to‑Cloud (端云联调) feature that creates a secure tunnel between a local development environment and the cloud VPC, and provides step‑by‑step commands and real‑world examples to streamline testing and troubleshooting.
IntelliJ IDEA's Stream Trace feature allows developers to visualize each step of Java Stream operations during debugging, showing element counts, intermediate results, and object details, with split and flat modes, demonstrated through a sample code that filters strings by length.
IntelliJ IDEA's StreamTrace feature allows developers to debug Java Stream pipelines by visualizing each operation's element count, results, and object details, with step-by-step screenshots and a code example that filters strings longer than five characters.
This article explains how to monitor, collect, and analyze real‑time logs, use multi‑dimensional metrics, perform local debugging, and enable cloud‑edge debugging for Spring Boot applications running on a Serverless platform, providing step‑by‑step commands and visual guides.
This guide walks through using Serverless Devs to collect real‑time logs, query metrics, perform local debugging, and enable cloud‑edge debugging for a Spring Boot e‑commerce application running on Alibaba Cloud Function Compute, with step‑by‑step commands and screenshots.
This guide walks through the required PyCharm settings—including interpreter selection, run/debug configurations, pytest integration, devserver options, and troubleshooting tips—so developers can run and debug the Sentry codebase effectively within the IDE.
The article details a week‑long investigation of unresponsive APIs in a sandbox environment, tracing the root cause to Redis connection pool blocking in a Spring Boot service, and presents step‑by‑step debugging, code analysis, configuration fixes, and best‑practice recommendations for proper Redis usage.
The article humorously showcases a series of poorly written code examples—from magic numbers and overly long variable names to emoji variables and convoluted switch statements—offering developers reflective commentary on common pitfalls and encouraging better coding practices.
This article describes the design and implementation of a comprehensive log tracking system for a phone SDK, covering client‑side logging, colored classification, plugin mechanisms, cloud‑native architecture, serverless functions, Elasticsearch storage, and real‑time visual debugging to enable rapid issue identification and resolution.
This article explains the background, design, and usage of Alibaba Cloud Function Compute's Instance Exec capability, showing how developers can securely access live function instances via the console or SDK, and apply it to troubleshooting, performance profiling, and custom runtime optimization.
The article details a step‑by‑step investigation of a Spring‑based backend where API requests hung due to Redis connection pool misconfiguration, showing how thread dumps, jstack, and Arthas were used to pinpoint blocking in Jedis pool acquisition, and provides corrected configuration and proper connection handling recommendations.
This article explains why and how to use code diff and code‑coverage metrics, provides concrete examples of debugging and test‑case design, and shares step‑by‑step instructions for using IDEA and remote debugging to ensure business quality throughout the development lifecycle.
This article explains how to locate and restore accidentally deleted source files by using various git log options, analyzes why the deletion went unnoticed during code review, and suggests preventive measures to automatically detect similar issues in the future.
This article explains the differences between memory leaks and memory overflows, outlines common causes and classifications of leaks, describes why leaks can lead to overflows, and provides practical steps to detect and fix both issues in long‑running applications.
This article analyzes why adding the FLAG_ACTIVITY_NEW_TASK flag can prevent an Android Activity from starting, examines the underlying framework source code—including startActivityInner, getReusableTask, recycleTask, and complyActivityFlags—and provides practical solutions to resolve the launch failure.
This article introduces five powerful IntelliJ IDEA debugging techniques—including conditional breakpoints, drop‑frame navigation, multithread control, remote debugging, and on‑the‑fly expression evaluation—to help Java developers efficiently locate and fix bugs in complex codebases.
This article explains how to build a non‑intrusive debugging and diagnostic platform for Node.js, covering process and thread inspection using the V8 Inspector API, dynamic control via an SDK, multi‑process and multi‑thread handling with Agent processes, and practical usage steps.
This article analyzes a Quartz 2.3.0 job‑scheduling issue where millions of daily triggers caused occasional duplicate executions, explains the underlying lock mechanisms and state transitions, and provides a simple configuration change to prevent the problem in distributed environments.
A colleague reported that a MyBatis insert stored a timestamp from the previous day, leading to a deep investigation that revealed mismatched timezone handling between MySQL, the JDBC driver, and Java, and presented two practical fixes to align all components.
This guide walks through installing Anaconda, Git, and VSCode, configuring the editor UI, keyboard shortcuts, essential extensions, terminal settings, and advanced debugging via launch.json to create an efficient Python development environment on Windows.
This editor's pick showcases a variety of technical articles on frontend development, including mini‑program integration, rich text editor evolution, Rust for JavaScript infrastructure, WebAssembly use cases, web screen recording, Webpack scope hoisting, Node.js multiprocess logging, JavaScript debugging, and Axios source code analysis.
This article explains the concept, principles, and practical steps of iOS symbolication, covering crash log processing, address translation, ASLR handling, function‑start and nlist tables, DWARF debugging information, and essential Xcode command‑line tools for accurate source‑level debugging.
This article introduces Android source code directory structures, explains how to configure a local development environment with IDEGen and Android Studio, demonstrates advanced debugging methods such as method, conditional, and log breakpoints, and walks through a real‑world permission‑granting case study to illustrate source‑level analysis and modification strategies.
This article introduces Loguru, a third‑party Python logging library, explains why it simplifies logging compared to the standard logging module, outlines its key features such as out‑of‑the‑box setup, async safety, lazy evaluation, and file rotation, and provides practical code examples for quick integration into scripts, libraries, and frameworks.
The article explains front‑end state management using San’s san‑store, detailing its Flux‑style architecture, action registration, component connection, immutable updates with san‑update, and a time‑travel debugging system that logs state changes, restores snapshots, computes efficient diffs, and discusses its benefits and limitations.
Visual Studio 2022 has been officially released with a go‑live license, bringing 64‑bit support, .NET 6, C++ 20, Azure Cloud Services, hot‑reload, enhanced debugging, Git integration, UI personalization, and many other productivity improvements for developers across languages and platforms.
This comprehensive article explains the inner workings of the Java Virtual Machine, covering class file structure, class loaders, memory layout, garbage collection, execution engine, debugging via JPDA, hot deployment, hot swapping, and performance tuning techniques, providing practical code examples and configuration tips.
This article walks through a seemingly simple Python input‑eval problem, reveals a hidden bug caused by extra parentheses around input(), demonstrates corrected code and extensive testing, and explains how proper use of eval can safely parse various data types.
This guide presents a comprehensive overview of Linux binary analysis and debugging tools—including nm, strings, strip, readelf, objdump, addr2line, gdb, ldd, strace, ltrace, time, gprof, valgrind, mtrace, oprofile, the proc filesystem and common system logs—explaining their purposes, key options, and typical usage patterns for both compilation and runtime phases.
This article introduces a custom Python logging wrapper built on the standard logging module and colorlog, explaining its design, configuration of console and file handlers, level settings, formatter setup, and usage examples to enhance debugging and monitoring across development, testing, and production phases.
The article explains a common MySQL UPDATE mistake where developers use AND between column assignments, shows the unexpected result of owner_code becoming 0, analyzes the logical expression behind it, and provides the correct comma‑separated syntax to reliably update multiple fields.
This guide explains what Kubernetes ephemeral containers are, why they’re useful for debugging, how to enable the feature gate, and provides step‑by‑step commands to create, attach to, and manage temporary containers within a pod.
This article provides a comprehensive guide to using the browser console's various methods—such as log, warn, error, info, time, group, count, table, and more—to debug JavaScript code effectively, including syntax examples, placeholders, styling tricks, and visual output demonstrations.
The article recounts a puzzling case where a custom Dubbo load‑balance extension (XLB) stopped being applied, explains how conflicting XML and Spring‑Boot configurations caused the consumer to ignore the custom setting, and walks through the source‑code investigation that reveals the loading order and caching behavior, ending with a concise summary of the root cause and resolution.
This guide introduces a comprehensive set of Linux command‑line utilities—including nm, strings, strip, readelf, objdump, addr2line, gdb, ldd, strace, ltrace, time, gprof, opprofile, valgrind, mtrace, and the proc filesystem—to help developers inspect binary symbols, trace system calls, profile CPU usage, detect memory errors, and understand system logs during both compilation and runtime phases.
This article explains why Node.js services can suffer from memory leaks, explores a V8 engine bug involving generators, walks through heap snapshot comparison and MAT analysis, lists common leak patterns, and presents practical tools and upgrade strategies to resolve the issue.
This case study describes how a rendering middle‑platform team tackled complex micro‑service chains, inconsistent data rules, and massive 3D data to create a full‑link location and visualization platform that enables self‑service debugging, reduces developer effort by over 30 %, and serves more than 170 monthly users.
This article analyzes a Maven multi‑module project where a static constant change in a shared API module caused unexpected Redis key errors at runtime due to JDK compile‑time constant folding, outlines the investigation steps, identifies the root cause, and provides best‑practice recommendations for version management.
A detailed forensic analysis reveals that a MySQL 5.7 instance stalls during startup due to a mismatch between InnoDB flush‑sync settings and truncate‑related redo logs, and the article explains how to diagnose the issue with TOP, stack traces, and source‑code inspection, then offers three practical work‑arounds.
The article explains how integrating Source Maps—generated by modern bundlers and automatically uploaded via a Webpack plugin—into iQIYI Hawkeye’s front‑end exception monitoring restores original file names and line numbers for minified production JavaScript errors, enabling rapid debugging despite bundle‑size and versioning challenges.
This guide walks Java developers through five essential IntelliJ IDEA debugging techniques—including conditional breakpoints, drop‑frame navigation, multithreaded debugging, remote debugging setup, and on‑the‑fly expression evaluation—to dramatically improve bug‑fixing efficiency.
Java 14 introduces enhanced NullPointerException messages via JEP 358, allowing developers to pinpoint the exact null variable in chain calls, with optional activation through the ShowCodeDetailsInExceptionMessages flag and considerations of performance and security.
The article recounts a real‑world incident where a container engine restart broke a FIFO, causing a Java service to stop responding, and walks through the step‑by‑step debugging process, explains the underlying stdio forwarding mechanism in container runtimes, and shows how a simple flag change fixes the bug.
This article compiles a practical set of Linux command examples and Java debugging utilities—including tail, grep, awk, find, tsar, btrace, Greys, Arthas, JProfiler, and various JVM tools—to help backend developers quickly diagnose and resolve performance and stability issues in production environments.
This guide presents eleven practical PyCharm tricks—from adjusting font sizes and customizing the UI to efficient code commenting, refactoring, package management, and debugging—helping both beginners and seasoned developers boost productivity and master the IDE’s powerful features.
This article presents a collection of powerful kubectl commands and techniques—including API inspection, status‑based pod filtering, node‑specific pod listing, distribution counting with awk, and proxy usage—to help Kubernetes users troubleshoot and manage clusters more efficiently.
This article explains why manual jar management can cause class loading conflicts, shows quick IDE-based steps to reorder jars for a temporary fix, and dives into JVM classloader isolation, the parent‑delegation mechanism, and Tomcat's startup loading order to help developers debug and prevent such issues.
This guide explains how to debug serverless applications using online console debugging, remote breakpoint debugging, command‑line tools, IDE plugins, web‑framework local testing, event simulation, and offers optimization tips such as resource assessment, code‑package sizing, instance reuse, and advanced platform features like pre‑freeze, pre‑stop, and single‑instance concurrency.
This article presents fifteen practical guidelines for effective Java logging, covering log levels, parameter tracing, formatting, conditional logging, performance‑friendly APIs, asynchronous output, proper exception handling, and log file organization to help developers quickly locate issues and maintain clean, efficient logs.
This article presents 15 practical logging best‑practice recommendations for Java developers, covering log level selection, formatting, conditional logging, performance‑friendly placeholders, asynchronous output, proper exception handling, and log file organization to improve debugging efficiency and maintainable production systems.
This article presents fifteen practical guidelines for logging in Java, covering proper log levels, parameter logging, formatting, conditional logging, log level guards, SLF4J usage, placeholder syntax, asynchronous output, exception handling, production debug policies, avoiding duplicate logs, file separation, and detailed logging for core modules.
This article explains Java deadlocks with synchronized and Lock examples, outlines the four necessary conditions, introduces detection tools such as jstack, jconsole, jvisualvm and jmc, and presents practical solutions including sequential locking and polling lock techniques with optimizations to avoid loops and starvation.
This article explains why studying Vue 3 source code is valuable, outlines potential pitfalls, details Vue 3’s design motivations, compares old and new features, answers common questions, and provides step‑by‑step debugging instructions with code examples.
This article explains the purpose, generation, and optimization of source maps in modern frontend builds, details the internal structure and VLQ encoding, compares the various webpack devtool options, and offers practical guidance on choosing the right mode for development and production environments.
An in-depth investigation of a MySQL InnoDB startup deadlock caused by truncate operations and the innodb_flush_sync parameter, detailing log observations, stack traces, source code examination, and three practical solutions including GDB intervention, parameter adjustment, and data directory cleanup.
This article explains the fundamentals of iOS crashes, describes exception types such as Mach and Signal, details stack memory layout and recovery techniques, and walks through several real‑world crash investigations—including WKWebView, ImageIO, and fishhook issues—culminating in practical mitigation steps that reduced crash rates by over 60%.
This article shares practical solutions and troubleshooting techniques for building WeChat mini‑programs with Taro.js, covering a three‑state draggable drawer, multi‑page swipe navigation, custom navigation bars, async cleanup, DOM timing, polyfill size, audio handling, scroll‑view quirks, canvas limitations, and image cropping methods.
This guide explains why raw iOS crash logs are unreadable, introduces dSYM files and DWARF debugging information, shows how to match UUIDs, compute addresses, and use both Xcode and command‑line tools for local symbolication, and describes a scalable online solution for massive crash‑log processing.
Quick-Debug provides a lightweight solution for developers to instantly debug applications running in Kubernetes by uploading compiled binaries directly to pods via a NodePort service, eliminating the need for repeated image rebuilds and deployments.
The case study walks through debugging a Go production service that regularly spiked to over 6 GB of resident memory, revealing that unbuffered channel leaks, mis‑configured HTTP client timeouts, and ultimately a cgo‑based image‑processing library spawning unmanaged threads caused the leaks, and outlines a systematic troubleshooting workflow.
This article documents the author's first experience debugging ClickHouse source code with GDB, explains the memory‑limit issue encountered when importing large MySQL tables, shows how to inspect stack frames, adjust the max_block_size setting, and verify the fix with a test insert.
This guide explains how to set up and use Microsoft Terminal and Visual Studio Code on Windows for Python development, covering installation, configuration, code editing, debugging, testing, and Git integration to create a smooth and productive workflow.
This article provides a detailed tutorial on using IntelliJ IDEA's debug mode, covering basic usage, shortcut keys, variable inspection, expression evaluation, smart step‑into, conditional breakpoints, multithreaded debugging, drop frame, force return, and JRebel activation for efficient Java development.
This article provides a comprehensive tutorial on using Node.js Inspector for local and remote debugging, automatic detection, data collection (heap snapshots and CPU profiles), dynamic activation, and a detailed walkthrough of its internal architecture and communication flow between the client, WebSocket, and V8 Inspector.
This article investigates an Android ANR triggered by a while‑true loop in TextView's getOffsetForHorizontal, reproduces the issue on Pixel 2, explains how to extract trace files, compares Android Studio debugging with Frida dynamic hooking, and provides step‑by‑step instructions to reproduce and debug the bug.
The article describes how the MOO app team used Flutter's Dart VM Observatory and Allocation Profile tools to detect and fix an image memory leak caused by a custom painter not deregistering an ImageStreamListener, demonstrating step-by-step snapshot comparison, reference‑chain analysis, and the resulting memory stabilization after code fix.
This article presents six practical Go techniques—including loop labels for prime number generation, IP address conversion, octal UTF‑8 decoding, a lightweight HTTP utility library, a concise debug logging helper, and a Go‑based httpbin replacement—complete with code examples, usage notes, and visual results.
The article explains how to analyze core‑dump files with GDB by examining the function call stack, key registers, and memory contents, classifying crash causes, using GDB commands to inspect variables and addresses, reconstructing corrupted stacks, handling optimized‑away data and vtable errors, and following a systematic debugging workflow.
An in‑depth troubleshooting story reveals how a container engine restart broke the FIFO used for stdio forwarding, causing a Java app to hang; the fix was simply changing the FIFO open mode from O_WRONLY to O_RDWR, and the article explains the underlying container I/O architecture.
This article explains how Ephemeral Containers, an alpha feature since Kubernetes v1.16, provide a native way to debug pods and even worker nodes, replacing older tools like kubectl‑debug and offering flexible, container‑agnostic troubleshooting with code examples and a custom debug image.
