This article explains several practical techniques for printing debug logs in embedded development—using SRAM buffers, SWO trace, UART with DMA, and GPIO‑bit‑banging—detailing their implementation, advantages, limitations, and code examples for reliable diagnostics on chips lacking conventional serial interfaces.
This article introduces the Model Context Protocol (MCP) as an open AI‑model integration standard, explains its client‑server architecture and components, shares practical Node/Python development pitfalls and debugging tips, discusses hallucination and error‑retry strategies, lists useful tools, and reflects on the broader implications of AI‑driven conversational services.
This article explains why a Spring Boot application fails to locate a template file when packaged as a JAR, details the step‑by‑step debugging process, and provides code solutions using ClassPathResource or PathMatchingResourcePatternResolver to correctly read resources inside the JAR.
This article walks through a real‑world case where adding a new JAR triggers a java.lang.StackOverflowError during Spring application startup, explains how hidden recursive calls in bean initialization cause the overflow, and offers debugging steps and a design‑level fix to prevent the issue.
This article explains what JVM thread dumps are, why they are crucial for fault testing, outlines common scenarios such as deadlocks and resource leaks, and provides step‑by‑step methods—including jstack, kill‑3, VisualVM, programmatic APIs, and Fabric8‑driven Kubernetes automation—to capture and analyze them effectively.
This guide explores C preprocessor macros in depth, covering basic constant and function‑like macros, stringification, token‑pasting, predefined macros, variadic macros, and practical tricks like conditional logging and simulated try‑catch, while warning about common pitfalls.
This guide presents nine practical Python debugging methods—including try‑except blocks, print statements, the pdb debugger, assertions, stack trace analysis, linting tools, IDE breakpoints, logging, and unit testing—to help developers quickly identify and resolve errors in their code.
This article examines the common pain points of on‑call debugging, explains how to extract useful information from error screenshots, and presents a Java‑based method call stack tracing tool that filters and visualizes stack frames to quickly locate code origins and improve troubleshooting efficiency.
This article introduces the Model Context Protocol (MCP) as an open standard for connecting large language models to external data and tools, explains its client‑server architecture, shares practical Node/TypeScript development pitfalls and debugging tips, and reflects on broader AI dialogue versus service integration scenarios.
This article introduces the Model Context Protocol (MCP), explains its client‑server architecture, shares practical development experiences and debugging tips for Node.js and Python implementations, discusses common pitfalls such as environment setup, hallucinations, and error handling, and reflects on the broader implications of AI‑driven services.
This article explains how the eBPF verifier checks user‑supplied BPF programs, details register types, instruction encoding, and the verification workflow, and illustrates typical verifier errors with concrete code examples and the exact kernel checks that trigger them.
The article explains how IntelliJ creates a debug session via XDebuggerManager.startSessionAndShowTab, the role of XDebugSession and XDebugProcess, and details the sequence of events and listeners involved when the session is stopped, including process termination and listener cleanup.
The article demonstrates that synchronizing on a locally created object does not provide proper thread safety, shows the resulting chaotic output, and explains how moving the lock object to a class field resolves the issue, illustrated with Java code and debugging screenshots.
This article explains why unit testing and debugging are essential in Python development, introduces the unittest and pytest frameworks, shows how to measure test coverage, demonstrates debugging methods like print statements, pdb, and IDE tools, and provides examples of integrating tests into CI pipelines.
This article explains why many consider embedded development difficult, then walks through systematic steps for reproducing, locating, analyzing, and resolving typical embedded bugs—including logging, online debugging, version rollback, binary commenting, register snapshots, and regression testing—to help engineers troubleshoot effectively.
The production failure where a customer‑service event creation stopped each morning was traced to RedisTemplate’s increment returning null because @Transactional combined with enabled Redis transaction support caused the command to be queued in a MULTI/EXEC block, which is fixed by using separate non‑transactional and transactional StringRedisTemplate beans.
This article describes the pain points of daily on‑call debugging, explains how Java StackTraceElement can be leveraged to construct a chain‑style call‑stack visualizer, details the implementation of a lightweight tracing utility with configurable filters, and demonstrates its integration and practical usage in production environments.
This article explains how to build and use a Java StackTrace utility that extracts and filters method call chains, enabling developers to quickly locate error sources, streamline debugging, and improve operational efficiency by visualizing execution paths through customizable parameters and integration examples.
This step‑by‑step tutorial walks front‑end developers through the entire process of integrating WeChat QR‑code login, covering prerequisite checklist, platform setup, core JavaScript SDK usage, callback handling, common pitfalls, security hardening, performance tweaks, debugging tricks, and a learning roadmap.
IntelliJ IDEA 2025.1 introduces comprehensive Java 24 support, makes Kotlin K2 the default mode, delivers a major AI assistant upgrade with free unlimited code completion, and adds numerous productivity enhancements such as improved debugging, UI redesign, containerfile support, and tighter Gradle integration.
This guide explains four practical techniques—parsing System.map, using vmlinux with nm/objdump/readelf, reading /proc/kallsyms, and calling kernel lookup APIs—to locate the exact address of any Linux kernel function for deeper debugging.
This article explains why the JVM throws java.lang.OutOfMemoryError: GC overhead limit exceeded, outlines common causes such as traffic spikes, memory leaks, insufficient heap and inefficient GC, and provides practical solutions and debugging steps to diagnose and fix the issue.
This article introduces Promtool, the multifunctional command‑line utility bundled with Prometheus, and explains how to validate configurations, check and test rules, query metrics, manage the TSDB, run unit tests, use debugging helpers, install the tool, and apply best‑practice recommendations.
This guide explains four practical ways to obtain Linux kernel function addresses—using the System.map symbol table, inspecting the vmlinux image with tools like nm, objdump and readelf, reading the live /proc/kallsyms file, and calling kernel APIs such as kallsyms_lookup_name and sprint_symbol.
This tutorial provides a thorough walkthrough of IntelliJ IDEA's Debug functionality, covering preparation, main interface, detailed explanations of service and debug buttons, variable inspection and modification, conditional breakpoints, expression evaluation, frame dropping, force return, multithreaded and Stream debugging, as well as remote debugging techniques.
This article explains Java's dynamic ClassLoader mechanism, outlines the hierarchy of built‑in loaders, details frequent problems such as ClassNotFoundException, NoClassDefFoundError, ClassCastException and version conflicts, and provides practical troubleshooting steps and best‑practice recommendations for reliable class loading.
Ray Flow Insight is an Ant Group open‑source tool that visualizes Ray's distributed programming primitives—Actors, Tasks, and Objects—to turn complex reinforcement‑learning systems from opaque "black boxes" into transparent, debuggable workflows, providing logical, physical, distributed stack, and flame‑graph views for performance analysis and optimization.
This article introduces bpftrace, an eBPF‑based dynamic tracing tool for Linux, explains its core concepts, technical architecture, installation methods, basic syntax, and demonstrates real‑world performance analysis, fault diagnosis, and security monitoring scenarios while comparing it with DTrace, SystemTap, and BCC.
This article provides a comprehensive guide to Linux's ftrace tool, explaining its purpose, various tracers, how to set up and use it via debugfs, detailed command examples, implementation details, practical use cases for performance tuning and debugging, and a comparison with other tracing utilities.
An in‑depth analysis reveals how misuse of InheritableThreadLocal with shared thread pools can sporadically produce NullPointerExceptions, detailing the root cause, code examples, debugging steps, and best‑practice recommendations to avoid thread‑local contamination in Java backend services.
Learn the essential differences between Python’s locals() and globals() functions, how they reveal variable scopes, how to modify them safely, and practical use cases such as dynamic variable creation, debugging, and performance considerations, all illustrated with clear code examples.
This article provides an in-depth tutorial on the GNU Debugger (GDB), covering its purpose, installation, basic and advanced commands, remote debugging, memory analysis, and practical tips for efficiently debugging C/C++ applications on Linux and Windows platforms.
The article shares a fresh graduate’s journey as a test development engineer at ZuanZuan, describing the initial confusion over testing concepts, the mentorship that clarified them, and the progressive skill upgrades and mindset shifts needed to become an effective, full‑stack contributor in a professional software team.
Large language models often struggle with coding tasks, failing to stop when encountering obstacles, ignoring black‑box testing principles, and making unnecessary refactors; this article examines those blind spots, offers practical examples, and suggests strategies such as preparatory refactoring, stateless tools, and careful prompting to improve AI‑assisted development.
This article walks through a real‑world Python time‑formatting bug, explains why a stray newline character breaks parsing, and provides a clear, step‑by‑step solution with screenshots to help developers quickly resolve similar issues.
This guide shows how to use nsenter to enter a container's network namespace for debugging, log into Kubernetes nodes via privileged pods, deploy a DaemonSet for persistent access, and compare nsenter with the newer kubectl debug temporary container approach.
This article explains what Linux kernel Oops messages are, distinguishes between BUG, Oops, and panic, outlines common causes, preparation steps, debugging tools, kernel configuration options, and provides a detailed case study with analysis and solutions for kernel Oops troubleshooting.
This article demonstrates a concise technique for intercepting Go panics, logging detailed error messages and stack traces using defer, recover, and debug.Stack, and explains when and how to apply it in development and production environments.
The article details four native DeWu Android client crashes—DNS resolution, MediaCodec state‑exception, BIO multi‑thread, and Xiaomi Android 15 focus null‑pointer—explains their root causes, and demonstrates inline‑hook, PLT‑hook, and JNI‑hook fixes that lowered the crash rate from 2/10 000 to about 1.2/10 000.
This guide introduces Alibaba's open‑source Arthas Java diagnostic tool, explains its installation, outlines common troubleshooting scenarios, and provides detailed examples of core commands such as stack, jad, sc, watch, trace, jobs, logger, dashboard, and redefine for live JVM debugging.
The article analyzes a server outage triggered by a module that repeatedly created a scheduled task without proper lifecycle control, examines the problematic Java code, lists four key issues, presents a corrected implementation, and reflects on development, testing, review, and logging practices to prevent similar incidents.
This article explores comprehensive PHP performance optimization strategies—including code-level improvements, configuration tweaks, and architectural enhancements—alongside practical debugging methods and monitoring tools, enabling developers to build efficient, stable web applications by reducing resource consumption, improving response times, and ensuring reliability.
This guide explains what ltrace is, how it works, how to install it, basic and advanced usage examples, real‑world scenarios, output interpretation, performance impact, troubleshooting, and comparisons with other debugging tools, providing a complete tutorial for Linux developers.
This article explains how enabling Java method breakpoints in IntelliJ IDEA can increase startup time from under two seconds to over thirty seconds, why the JVM design causes the slowdown, and provides practical steps—removing method breakpoints, disabling method‑exit events, and using line breakpoints—to restore fast debugging performance.
This article introduces several advanced IntelliJ IDEA debugging techniques—including Evaluate and Log 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 source code.
This article introduces three core tools—Python's built‑in debugger (pdb), the real‑time event‑loop monitor aiomonitor, and the testing library asynctest—to help developers track, debug, and prevent bugs in asynchronous Python programs, complete with practical code examples and usage instructions.
This article explains how memory leaks occur in C programs, outlines the three essential elements of a leak, clarifies common misconceptions about freeing heap memory, and provides a practical code‑review checklist to detect and prevent leaks before deployment.
An in‑depth investigation reveals why MySQL versions prior to 5.7.31 incorrectly treat back‑ticked asterisks as column names, causing “Unknown column ‘*’” errors, and shows how systematic testing and version‑specific patches resolved the issue for DBAs and developers.
This article explains why Linux programs may exit unexpectedly, introduces the backtrace utility and its underlying call‑stack mechanism, and provides step‑by‑step instructions—including compilation flags, signal handling, and address‑to‑source mapping—to accurately locate the root cause of crashes.
This article explores techniques to optimize UI automation testing using Playwright, including performance bottleneck analysis, debugging tools, logging strategies, and leveraging headless mode for efficiency.
This article walks through reproducing a memory‑leak scenario in a Vue2‑based terminal application, analyzes common leak causes, demonstrates how adding dynamic keys and patching Vue's sameVnode function resolves the issue, and shows how to ship the fix with patch‑package for production deployments.
This article explains how to set hardware and software watchpoints in GDB to monitor specific memory addresses, demonstrates the technique with a multithreaded C++ example, and describes the underlying CPU debug registers that enable precise detection of reads and writes.
Discover five advanced debugging strategies—including effective use of the debugger breakpoint, console’s advanced methods, source maps for production code, asynchronous debugging tricks, and performance profiling tools—to quickly identify and resolve complex JavaScript issues in modern front‑end development.
This article explains how Byteman's IMPORT declaration lets developers explicitly reference classes across modules, handling classloader scopes, providing code examples, key points, and plugin support for various Java module systems.
This article explains why robust exception handling and logging are essential in Python development, introduces built‑in exception types, demonstrates try‑except‑else‑finally patterns, shows how to use assert and raise, creates custom exceptions, and provides practical logging examples with code snippets.
This article explains the limitations of using print() for debugging Python code and demonstrates how the IceCream library’s ic() function provides richer, more organized output, supports assignment, visualizes complex data structures, and offers configurable logging features.
This article shares seven practical habits—from mastering fundamentals and writing clean code to debugging effectively and building real‑world projects—that help programmers become more skilled, professional, and collaborative in their development journey.
This article explains how the built‑in Linux kernel tracer ftrace works, walks through its various tracers, shows how to configure and use it via debugfs, and demonstrates practical performance‑optimisation and fault‑diagnosis scenarios while comparing it with SystemTap and LTTng.
This article lists eight common beginner programming mistakes—from using wrong punctuation and forgetting WHERE clauses to leaking resources, storing passwords in plain text, exposing API keys, mixing environments, force‑pushing code, and committing secrets—explaining why they happen, showing concrete code examples, and offering practical fixes.
The article analyzes why using the auto‑instrumentation command `otel go build -race` causes a crash, tracing the failure to the injected runtime code, the Go‑C calling conventions, and a zeroed race context, and then presents practical fixes to prevent the crash.
The article explains the performance benefits of using FP8 for large‑model training, outlines three main categories of FP8‑related issues such as loss spikes, divergence, and downstream metric gaps, and introduces a dedicated FP8 debug tool with metrics like MSE, cosine similarity, underflow, and overflow to help diagnose and resolve these problems.
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.
