The author recounts a two‑day investigation of a widespread FastJson failure caused by a Kotlin lambda mistakenly assigned to an Object field, detailing the mixed‑language project background, the puzzling symptoms, step‑by‑step debugging, the root‑cause analysis, and the final resolution.
This article explains Linux core dump generation, common causes such as null pointer dereference and array overflow, configuration steps, and demonstrates how to analyze core files using GDB with practical code examples and multi‑threaded case studies.
The article uses everyday analogies to explain why multithreaded programming, especially when dealing with shared data, debugging, and performance optimization, is inherently difficult due to nondeterministic execution, combination explosion, and the challenges of lock granularity.
This article provides a comprehensive overview of Linux kernel tracing mechanisms—including probes, tracepoints, kprobes, uprobes, and ftrace—explaining their principles, implementation details, practical tools, and real‑world case studies for performance optimization, fault diagnosis, and security monitoring.
This article analyzes a thread‑pool exhaustion issue in JD's JSF framework during a Redis cache upgrade, detailing log evidence, stack‑trace analysis, lock contention caused by read/write locks and ForkJoinPool usage, and the steps taken to diagnose and resolve the problem.
Through benchmark tests, memory analysis, and code examples, this article presents ten compelling reasons why using a traditional for loop to traverse Java Lists often outperforms Stream.forEach in terms of performance, memory usage, control flow, exception handling, mutability, debugging, readability, and state management.
ThinkPHP 8.1.2 introduces a host of improvements such as enhanced event subscription, new validation utilities, route grouping options, cookie handling fixes, multi‑module view rendering, language auto‑detect, and a brand‑new debugging library that supports local and remote debugging via Composer.
Debugging asynchronous Python code can be challenging, but by using the built-in pdb debugger, the aiomonitor tool for real-time event-loop inspection, and the asynctest library for testing race conditions, developers can efficiently identify and prevent bugs in async applications.
This article walks through a real‑world incident where a PHP service consumed over 80% CPU, detailing how to identify the offending processes with htop, examine their status, trace system calls with strace, inspect file descriptors via lsof, and ultimately locate and correct a looping SQL query that caused the overload.
This guide walks you through essential Linux command‑line utilities for network troubleshooting, system monitoring, and developer workflows, providing clear usage syntax, practical examples, and concise tips to help you diagnose connectivity issues, inspect logs, and boost productivity on any Linux host.
This guide explains what JavaScript memory leaks are, illustrates typical front‑end leak scenarios such as forgotten timers, detached DOM references, improper closures, global variables, open WebSockets, misuse of Map/Set, and console logs, and provides practical solutions to prevent and resolve each issue.
This article walks through migrating an old MySQL‑5.7 project from MyBatis 3.5.0 to MyBatis‑Plus 3.1.1, explains the "Conversion not supported for type java.time.LocalDateTime" exception, shows how upgrading mysql‑connector‑java resolves the issue, and shares lessons learned from a production bug caused by an over‑optimistic validation change.
This article investigates a deadlock that occurs when using INSERT … ON DUPLICATE KEY UPDATE in a multi‑threaded MySQL 8.0 environment, reproduces the issue, examines InnoDB lock logs, walks through the relevant source‑code call chain, and demonstrates how gap locks cause the deadlock.
This article explains why assigning a function to a variable without parentheses doesn’t invoke it, how to pass functions as arguments in Python, and demonstrates the concept with a Prisoner’s Dilemma code example, clarifying common misconceptions about function calls and references.
This guide explains the WeChat Mini Program review workflow, lists the most frequent rejection reasons such as missing privacy policies, incomplete content, mismatched categories, and provides concrete steps—including code adjustments and documentation tips—to dramatically improve approval chances.
This article provides a detailed tutorial on cURL, covering its basic usage, key options for HTTP and HTTPS requests, file upload and download techniques, and common troubleshooting tips to help developers efficiently interact with web services from the command line.
The author describes how changing a SpringBoot controller annotation from @GetMapping to @PostMapping caused a silent 404 error, how a teammate quickly fixed it by disabling CSRF, and how a visual tool helped reveal the underlying filter-chain behavior.
This article walks through the process of swapping MyBatis for MyBatis‑Plus in a legacy Java project, explains why upgrading MyBatis to 3.5.1 triggers a LocalDateTime conversion error, shows how updating mysql‑connector‑java resolves the issue, and shares the broader pitfalls of component upgrades and bug fixes.
This article walks through a real‑world case where swapping MyBatis for MyBatis‑Plus introduced a LocalDateTime conversion error, explains the root cause in MyBatis version changes and JDBC driver support, and shares subsequent bug fixes and lessons on cautious component upgrades.
Because MyBatis reads a primitive boolean field directly when no getter exists, the default false value is bound as 0, causing an unexpected zero in the MySQL tinyint column; changing the field to the Boolean wrapper (initialized to true) or fixing the update logic resolves the issue.
This article explains how the IceCream library's ic() function provides a more systematic and powerful alternative to print‑based debugging in Python, offering detailed execution traces, integrated assignment, and clear visualization of simple and complex data structures.
This article walks through replacing MyBatis with MyBatis-Plus in a Spring Boot project, explains the LocalDateTime conversion error caused by MyBatis 3.5.1 and an outdated MySQL connector, and shows how upgrading the connector resolves the issue while highlighting the risks of component upgrades.
This article provides a detailed walkthrough of IntelliJ IDEA's debugging capabilities, covering preparation, main interface components, step controls, variable inspection, conditional breakpoints, expression evaluation, frame dropping, force return, multithreaded and stream debugging, as well as remote debugging techniques, supplemented by a Java code example.
The article analyzes a mysterious production stall caused by a TCP communication bug where the D4 and D5 stages are merged, leading to a mis‑aligned length field that makes the server read an incorrect payload size, and presents two concrete fixes.
The article explains how AI agents, integrated into transaction systems, automate log analysis, generate test data via natural-language tools, and preserve expert knowledge, achieving at least a 50 % boost in issue-tracing efficiency, reducing debugging time, and empowering developers to focus on feature development and stability.
A detailed post‑mortem explains how a special request caused an Nginx‑based data‑collection gateway to spike memory usage, trigger OOM‑killer termination, and crash, and walks through the debugging steps, core‑dump analysis, root‑cause discovery, and the eventual fix.
This article demonstrates how to use eBPF together with BTF to trace BPF map update and delete functions, shows concrete command‑line output, explains the code that identifies target kernel functions, and details the data‑dumping logic for debugging map contents.
This article explains how Windows minidump files are organized, detailing the header, key stream types such as ThreadListStream, ModuleListStream, ExceptionStream, SystemInfoStream, and MiscInfoStream, and shows how to extract useful crash information for debugging.
This article provides a step‑by‑step tutorial on using IntelliJ IDEA's Debug tool, covering preparation, main interface elements, each debugging button, variable inspection and modification, conditional breakpoints, expression evaluation, rollback, force return, multi‑thread, Stream and remote debugging, with code examples and screenshots.
This article explains how the Huolala mobile team built a stable symbol demangling system using the open‑source symbolic‑demangle tool, covering the concepts of name mangling, why symbolic was chosen, step‑by‑step adaptation for newer Swift versions, Linux Python‑wheel building, and practical troubleshooting tips.
A Python community member struggled with the debugger stopping at “Connected” in PyCharm, discovered the cause was a mismatched virtual environment, and resolved it by recreating the project within the correct environment, offering practical troubleshooting tips for future debugging queries.
This article presents 17 frequent Python runtime and syntax errors, explains why they occur, and provides clear code examples and corrections to help beginners quickly identify and resolve these issues while improving their debugging skills.
The article reveals a bug in Go 1.23’s newly added iterator that corrupts results in three‑level nested loops, demonstrates the issue with a reproducible code sample, explains the underlying cause, offers a temporary compile‑flag workaround, and notes the imminent fix.
This article introduces ten essential PHP plugins—such as Composer, PHPUnit, and Xdebug—detailing their core features like dependency management, automated testing, performance debugging, code style enforcement, and HTTP handling, to help developers boost productivity and maintain high code quality across projects.
The article details a mysterious production stall at 70% caused by a TCP packet length field misalignment when the configuration name is "rabbit‑TD", explains the step‑by‑step investigation using server logs and packet captures, identifies the root cause of the merged D4/D5 packets, and proposes two concrete fixes to correct the length handling.
Go 1.23 introduces a garbage‑collectable, synchronous timer channel implementation that eliminates resource leaks and race conditions, requiring code changes such as replacing len‑checks with non‑blocking selects and offering GODEBUG flags for toggling the new behavior during testing and production.
This article explains how to locate OBServer crash logs, extract stack traces from observer.log, map memory addresses to source code using addr2line and gdb, identify the faulty function ObMPStmtExecute::copy_or_convert_str, and verify the issue through the OceanBase knowledge base, providing a systematic five‑step approach for rapid crash diagnosis.
This guide outlines systematic steps for gathering environment and error details, reproducing bugs across different setups, analyzing logs and source code, narrowing down problem areas, and effectively communicating with developers, product managers, testers, on‑site staff, and customers to resolve software issues.
This article explains why Fiddler shows garbled characters when capturing a Python request for an image, clarifies that the response should be treated as binary content rather than text, and provides a step‑by‑step solution to correctly decode the data.
This article walks through the anatomy of a Java Virtual Machine crash, explains how to read the generated hs_err_pid log and core dump, and provides practical debugging steps—including code examples, signal analysis, register context, and GDB commands—to pinpoint and resolve the root cause.
This article explains how Windows minidump files are structured, detailing the header and key streams such as ThreadListStream, ModuleListStream, ExceptionStream, SystemInfoStream, and MiscInfoStream, and shows how this information helps pinpoint the exact cause of a program crash.
A seemingly tiny 8‑byte request body size restriction caused a production outage in a serverless education platform, leading the team through extensive debugging, discovery of an AWS WAF payload limit, and ultimately a fix that highlighted the importance of proper documentation and infrastructure awareness.
This article introduces CGDB, explains how to choose the appropriate GDB version, provides step‑by‑step installation commands for both CGDB and GDB, and demonstrates practical debugging scenarios with MySQL, including attaching to processes, inspecting threads, analyzing core dumps, and adjusting runtime variables.
This guide shares eight actionable steps—including exploring features, reading documentation, inspecting APIs, reviewing database schemas, fixing bugs, drawing flowcharts, troubleshooting live issues, and implementing new requirements—to help developers efficiently onboard and become productive on any new software project.
This article examines the challenges of using remote components in DingTalk and WeChat mini‑programs, compares them with traditional npm packages, and presents a practical Taro‑based debugging workflow that leverages alias configuration and hot‑module replacement to streamline development.
Using an LLM-powered IDE, the author built a full‑stack weekend project without writing a single line of code, discovering faster development cycles, new debugging habits, and the strengths and limits of AI assistants compared to traditional Google searches.
The article dissects Python's virtual machine execution flow, showing that bytecode runs inside dynamically created stack‑frame objects rather than the static PyCodeObject, and explains the internal structures, memory optimizations, and debugging interfaces that make this possible.
Debugging Kubernetes components is challenging due to version mismatches, service dependencies, and IDE limitations; this guide outlines two practical methods—log‑based analysis with redeployed services and direct IDE debugging—while detailing environment setup, local and remote development workflows, and testing procedures.
Learn how to transform Visual Studio Code into a high‑productivity development environment by customizing the interface, mastering keyboard shortcuts, leveraging powerful extensions like Prettier, ESLint, and Live Server, integrating Git version control, and utilizing IntelliSense, code navigation, and advanced debugging techniques.
The paper introduces a production‑grade framework that uses tiny controlled traffic, feature‑flattening experiments, dynamic debugging, and an automated inspection flywheel to measure each component’s contribution to Baidu’s search result diff‑rate, isolate root causes, and dramatically reduce inconsistency without impacting real users.
After upgrading from Tomcat 7 to Tomcat 8, the application’s mixed log4j‑1.4 and logback‑1.2.3 dependencies caused the SLF4J binder to be loaded nondeterministically, so Tomcat 8 sometimes selected the Log4j binder without a configuration file, resulting in completely missing log output; removing the conflicting jars or enforcing a deterministic class‑loading order restored logging.
This article provides a comprehensive guide to Python fundamentals, covering CSV file reading and writing, powerful iterator utilities from itertools, advanced collection types like Counter, defaultdict and OrderedDict, techniques for error and warning output, code debugging, style checking, profiling, and practical performance‑optimisation principles.
This comprehensive guide explains Python's built‑in logging module, covering basic setup, log levels, handlers, formatters, advanced configurations, performance optimizations, and best‑practice recommendations to help developers create clear, efficient, and maintainable logs for any application.
This article provides a thorough overview of Linux kernel debugging techniques, covering pseudo‑filesystems such as procfs, sysfs, debugfs and relayfs, as well as essential tools like printk, ftrace, trace‑cmd, kprobe, systemtap, kgdb, kgtp, perf, and other modern tracers, helping developers diagnose and optimise kernel behavior.
The article walks through a first‑time user’s experience with PyODPS, showing how its Python‑based DataFrame API offers more flexible JSON field statistics, multi‑condition filtering, and custom aggregations than traditional ODPS SQL, while noting a steep learning curve and syntax quirks.
After upgrading to JDK 11, a FastJSON serialization bug caused the amount field in Money objects to disappear, leading to failed refunds; this article details the investigation, from classloader quirks and ASM handling to dependency conflicts and the ultimate fix of removing a problematic jar.
This article details a step‑by‑step investigation of a Netty off‑heap memory leak that caused Nginx 5xx errors, covering background, alert analysis, multiple debugging stages, reflective monitoring, the root‑cause NPE fix, and verification in both local and production environments.
This article explains how the open‑source PySnooper library replaces manual print statements by automatically logging line execution, variable values, and timing through a simple decorator, offering a lightweight yet powerful way to debug Python code across various projects.
The article dissects HarmonyOS ArkUI’s reactive architecture, showing how the open‑source AceEngine wraps state in ObservedProperty objects, tracks dependencies, updates dirty elements, extends the TypeScript compiler with custom UI syntax, bundles via Rollup, and provides a CDP‑based debugger, achieving fine‑grained updates comparable to Vue but with lower memory overhead and faster response on HarmonyOS devices.
The author recounts switching from Gson to Fastjson, encountering a date‑formatting bug that only appears on Linux due to an outdated Fastjson version, explores a circular‑reference $ref issue, and shares debugging steps, GitHub issue references, and practical fixes for reliable JSON serialization.
This article explains ESLint's highly configurable static analysis architecture, clarifies the roles of parsers, processors, configs and plugins, explores the intricacies of its configuration system, and provides practical debugging methods—including performance profiling and a real‑world import/no-cycle case study.
This article explains why memory leaks occur only with heap allocations in C, describes how malloc and related functions allocate memory, outlines two common ways to obtain heap memory, identifies the three essential elements of a leak, debunks common freeing misconceptions, and provides practical inspection steps to prevent leaks.
The article examines the “hardcore programmer” mindset that rejects modern IDEs, GUIs, and AI, tracing its roots to early resource‑constrained computing, debunking myths about IDEs, CLI, OS choice, and AI, and advocating a balanced, tool‑agnostic approach to boost productivity and code quality.
After integrating JaCoCo, a Java service threw a ClassCastException during order processing due to the synthetic $jacocoData boolean array, and the article details the root cause, code analysis, synthetic fields, JaCoCo probe insertion, and a robust fix using field.isSynthetic() filtering.
This article details a Java ClassCastException caused by JaCoCo’s injected $jacocoData boolean array, explains how synthetic fields arise during bytecode instrumentation, analyzes the failing encryptObject method, and presents a fix by filtering synthetic fields using isSynthetic() to restore normal order processing.
The article analyzes a MySQL 5.7 replication bug where, after consecutive crashes, the slave ends up with more GTIDs than the master because the last binlog’s GTIDs are not persisted, and demonstrates the problem using GDB debugging and step‑by‑step reproduction.
This guide explains why developers love Google DevTools, introduces VS Code's launch.json for configuring debugging sessions, covers REPL basics, provides practical examples for Node.js and Chrome debugging, and details every launch.json option with descriptions, types, defaults, and sample code.
Netcap, an open‑source eBPF‑based kernel network capture tool from ByteDance STE, lets developers trace packets across the entire Linux network stack, filter with tcpdump syntax, and extend functionality with custom filters, dramatically improving the efficiency of diagnosing kernel packet loss problems.
This article explains how Alibaba Cloud's SLS data processing resolves the tension between simple log collection and the need for structured, analyzable data by introducing a unified SPL syntax, delivering over tenfold performance gains, reducing costs to one‑third, and providing powerful debugging tools for cloud‑native log analytics.
During a Monday incident where the backend service became unavailable three times, the author details step-by-step investigations—checking frontend responses, container status, JVM and thread pool metrics, and database connection pool usage—ultimately identifying a slow, unindexed SQL query that exhausted connections, and describes the remediation and lessons learned.
An Android app that stores shop‑sign photos began corrupting WebP images at a stable 1/200 rate, leading to a thorough investigation of the storage module, AES encryption implementation, and thread safety, ultimately uncovering a faulty string‑length check that broke binary image handling.
This guide walks through Spring Cloud Gateway features—including marking exchanges as routed, enabling route metrics, configuring metadata, accessing Reactor Netty logs, troubleshooting with debug logging, disabling automatic route refresh, ordering global filters, using Actuator sub‑paths, and rewriting request parameters—complete with code snippets and configuration examples.
This guide explains how to use PowerShell's Start-Transcript command to capture all input and output of a session, covering basic usage, specifying output files, append mode, error capture, and practical scenarios like debugging, auditing, and training.
The article explains how sorting a List while iterating over it in Java can cause a ConcurrentModificationException, describes the fast‑fail mechanism of iterators, shows the root cause in nested method calls, and provides a safe fix using a copied list.
This article provides a comprehensive, step‑by‑step tutorial on Python's built‑in debugger Pdb, covering its purpose, how to start it, essential commands, practical debugging examples, advanced features like conditional breakpoints and stack inspection, and tips for improving debugging efficiency.
This article explains how to use IntelliJ IDEA's advanced debugging features, including conditional breakpoints and the evaluate expression tool, with step‑by‑step instructions, practical code examples, and tips for efficiently locating and fixing Java runtime errors.
The article analyzes a crash that occurs on Windows 10 when a 64‑bit program mixes RSP and ESP instructions, explains how writing to the 32‑bit ESP register zero‑extends the upper 32 bits of RSP, and shows how this stack‑pointer mismatch leads to an access‑violation error that does not appear on Windows 7.
This article introduces the OpenCoreAnalysisKit project, an open‑source suite for offline analysis of Android Core memory files across multiple architectures, detailing its components, build requirements, usage guides for kernel‑ and user‑mode debugging, and various command‑line tools and code snippets for comprehensive reverse‑engineering and memory‑analysis workflows.
This guide walks you through using istioctl to inspect mesh status, retrieve proxy configurations, debug Envoy listeners, routes, clusters, and endpoints, validate mutual TLS policies, analyze configuration errors, and leverage component introspection tools for effective Istio service‑mesh operations.
This article walks through the complete troubleshooting process for a non‑functional logback‑spring.xml in a Spring Boot application, covering background, configuration steps, common pitfalls such as variable resolution and dependency conflicts, remote debugging techniques, and final recommendations to ensure proper log output.
This article explains Android ANR (Application Not Responding) fundamentals, detailing its four types, underlying causes such as main‑thread blocking and deadlocks, the system’s timeout mechanisms, step‑by‑step analysis workflow, trace interpretation, and practical best‑practice tips to prevent and resolve ANR problems.
The article reveals that MyBatis’s OGNL treats a single‑character literal like '1' as a Character, causing equality checks against String values in if tags to fail, and shows how using double quotes, toString(), or proper type conversion resolves the comparison pitfall.
This article details the investigation of a "directory not empty" failure when using Go's os.RemoveAll on a self‑built FUSE‑based distributed filesystem, describing the kernel readdir offset issue, the debugging steps taken, and the final fix applied.
This article walks through a real Linux kernel hard lockup case, explaining what hard lockup is, analyzing stack traces and register values, identifying a spinlock contention on a per‑CPU runqueue, and showing how an inappropriate GFP flag caused interrupts to be enabled at the wrong time, leading to a deadlock and the eventual fix.
This article explains practical methods for diagnosing and fixing production‑time JavaScript errors by using the Ajax‑Interceptor Chrome extension, understanding hidden‑source‑map vs source‑map differences, adding source‑map files in Chrome, and applying manual source‑map mapping or proxy tools like Charles.
This guide explains how to set up a launch.json file in VSCode, add breakpoints, and run the debugger to efficiently troubleshoot front‑end code, highlighting the use of Chrome launch, breakpoint panels, variable inspection, and step‑through execution.
The article details the complete process of porting QQ's NTRTC audio/video SDK to Linux, covering platform surveys, packaging, build‑time issues like GLIBC mismatches and fPIC errors, debugging steps, Qt/Electron demos, GPU blocklist workarounds, and future compatibility plans.
This guide introduces Memray, a powerful Python memory analysis tool, explains how to install it, run command‑line profiling, integrate it into code with the Tracker API, interpret detailed reports, and apply advanced filtering and merging techniques while noting its runtime overhead.
This article details the evolution of Tencent News from a portal‑style content display to a personalized recommendation engine, describing the legacy architecture problems, the design goals, the new modular and scalable architecture, feature platform improvements, debugging tools, and stability measures that together increased availability to 99.99% and cut costs by over 60%.
This guide explains how to create a Node.js script that automatically generates export statements for component libraries, covering script basics, file operations with fs‑extra, package imports, npm integration, and debugging techniques using VS Code.
Java developers can quickly establish a Go development environment by installing Homebrew, Go, and the Delve debugger, configuring essential environment variables, choosing an IDE such as GoLand or VS Code, organizing projects with standard cmd/internal layouts, managing dependencies via go.mod, automating builds with a Makefile, and debugging or packaging the resulting binaries.
This guide explains why embedded development seems difficult and provides a systematic approach to reproducing, locating, analyzing, and resolving typical embedded problems—including simulation conditions, log printing, online debugging, version rollback, binary search commenting, register snapshots, stack overflow, and hardware quirks—plus regression testing and experience summary.
An old Java project using MySQL, MyBatis, and an outdated mysql‑connector‑java driver encounters a “Conversion not supported for type java.time.LocalDateTime” error after swapping MyBatis for MyBatis‑Plus; the article walks through reproducing the issue, analyzing MyBatis version changes, upgrading the JDBC driver, and fixing subsequent bugs.
This guide explains how to enable Java remote debugging, step by step, to efficiently locate issues that only appear in pre‑release or production environments, using IDEA and a simple command‑line configuration.
This article systematically analyzes a function call in an embedded system from four perspectives—assembly code, registers, stack layout, and map files—illustrating how the compiler generates the call, what values each register holds, how the stack is allocated, and how to trace execution using disassembly and memory views.
The article explains how a custom java.net.spi.InetAddressResolverProvider SPI that works in a regular Spring Boot 3.x JAR fails when the OpenTelemetry Java agent is added because the agent’s JarLoader cannot read the SPI configuration inside the BOOT‑INF layout, and resolves the issue by disabling the agent’s own resolver resource so the custom provider is used.
This article explains Go's runtime Frame struct, shows how to retrieve call‑stack details with runtime.Callers and runtime.CallersFrames, and demonstrates practical uses in debugging, logging, performance profiling, and error handling with clear code examples.
Understanding how call stacks and stack frames work is essential for developers, and this article explains their dynamic, ordered, and local nature, details stack frame structure, walks through a Go code example illustrating function calls and returns, and shows how to leverage runtime utilities for debugging.
This article explains why traditional kubectl exec fails under common Kubernetes security best‑practices and demonstrates how to use kubectl debug to launch temporary containers with shared namespaces, install tools like htop, and explore alternative debugging methods such as kpexec and AI‑assisted Appilot.
This guide walks through Go's pprof tool, detailing each command‑line option, its purpose, and example usage so developers can comprehensively profile, visualise, and optimise Go applications for better performance and stability.
