This article explains how to implement plugin mechanisms in Java using SPI and ServiceLoader, demonstrates custom configuration approaches, and shows how Spring Boot’s spring.factories can be leveraged for extensible services, providing practical code examples and step‑by‑step guidance for building modular backend applications.
When migrating an old Java project from MyBatis 3.5.0 to MyBatis‑Plus 3.1.1, a test failed with “Conversion not supported for type java.time.LocalDateTime” because MyBatis 3.5.1 stopped handling Java 8 time types and the existing mysql‑connector‑java 5.1.26 driver lacked support, which was resolved by upgrading the connector to version 5.1.37 or later, highlighting the need for thorough compatibility testing during framework upgrades.
This article demonstrates how to encapsulate Alibaba's EasyExcel library within a Spring Boot backend, providing step‑by‑step environment setup, entity annotations, service interfaces, implementation details, usage examples, and solutions to common issues such as date conversion and template‑based export limitations.
This article introduces a lightweight, extensible Java framework that uses custom annotations to translate relational data, dictionaries, collections, and nested objects, detailing its background, architecture, core annotation design, usage examples, advanced features, Spring Boot integration, ORM support, and provides the open‑source repository link.
This article explains six typical pitfalls when using Java's BigDecimal—such as initializing with floating‑point literals, ignoring scale in division, misusing equals, misunderstanding scale, overlooking immutability, and performance costs—and provides clear code examples and best‑practice solutions to prevent precision loss and inefficiency.
This article walks through a real‑world Java CPU‑usage issue, showing how top, thread ID conversion, and jstack were used to pinpoint a faulty loop in LoguUtil, then verifies the fix restores normal CPU consumption while emphasizing the importance of performance testing.
Aeron is an open‑source, low‑latency, high‑throughput messaging framework that leverages zero‑copy memory, shared‑memory IPC and UDP transport to deliver microsecond‑level latency for finance, gaming, and distributed systems, offering a simple API and powerful performance features.
This article explains how Java classes are loaded into the JVM, details the class loader’s parent‑delegation mechanism, and walks through the execution flow of a sample program, covering stack frames, heap allocation, dynamic linking, method area, program counter, native method stack, and garbage collection.
This article walks through initializing a Spring Boot project, handling version compatibility between Spring Cloud, Spring Boot, and Kafka, demonstrates common scaffolding code such as global exception handling, logging, CORS configuration, and recommends useful tools like Maven, embedded Redis, MyBatis‑Plus, and MapStruct for backend development.
This article explains why using Java's Arrays.asList to convert an array into a List can cause UnsupportedOperationException when modifying the list, illustrates the underlying implementation details, and provides a safe solution using java.util.ArrayList to prevent serious runtime failures.
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.
This article explains why the standard Executors factory methods may be insufficient, details each ThreadPoolExecutor constructor parameter, demonstrates how to configure a custom pool for performance testing, and walks through multiple code examples that illustrate thread creation, queue behavior, and rejection policies.
This guide presents a comprehensive design for securing third‑party API calls, covering Access Key/Secret Key generation, permission granularity, timestamp and nonce based replay protection, signature creation and verification, token handling, TLS encryption, rate limiting, logging, and practical Java code examples.
This article explores Java's class loading mechanism in depth, covering when and how classes are loaded, the parent‑delegation model, the internal role of ClassFileParser and InstanceKlass, parallel loading nuances, and practical ways to break or extend the delegation chain with custom class loaders.
This article investigates MySQL's recommendation to avoid UUID or random Snowflake IDs as primary keys, comparing auto‑increment, UUID, and random long keys through Java/JDBC performance tests, analyzing their insertion speed, index structure impact, and the trade‑offs of each approach.
Spring Boot 3.4 adds automatic multi‑client RestClient configuration, Bean‑Validation‑based property checks, default graceful shutdown, ECS/GELF/Logstash structured logging, enhanced observability with application grouping and OTLP tracing, upgraded core and third‑party dependencies, AssertJ‑enabled MockMvc testing, and replaces old management endpoint settings with access‑based properties.
This article details a comprehensive set of optimizations that reduced a SpringBoot application's startup time from 400‑500 seconds to about 130‑150 seconds, covering Actuator monitoring, Tomcat TLD scan disabling, HBase asynchronous warm‑up, custom BeanPostProcessor timing, JSF consumer proxy refactoring, Tomcat version impacts, and hardware upgrades.
This article documents the systematic analysis and multi‑step optimization of a SpringBoot application's slow startup, covering profiling with Actuator, Tomcat TLD scan disabling, HBase async warm‑up, custom BeanPostProcessor timing, and asynchronous JSF consumer initialization to cut launch time by over 60 percent.
This comprehensive guide explores Spring Boot 3.4’s performance boosts, enhanced observability, and developer experience improvements, detailing major changes such as RestClient/RestTemplate auto‑configuration, bean validation updates, graceful shutdown, structured logging formats, observability enhancements, dependency upgrades, testing enhancements, and deprecated feature handling, with practical code snippets.
The article explains that the Java increment operation i++ is not atomic, describes the three‑step execution that leads to race conditions in multithreaded environments, and shows how to reproduce and fix the issue using synchronized blocks, AtomicInteger, and Byteman fault‑injection scripts.
This article provides a comprehensive guide on dynamically loading JAR packages in Spring Boot, covering core concepts, benefits, and step‑by‑step implementations using SpringBootClassLoader and third‑party OSGi libraries, complete with practical code examples.
This article explains how Java agents work, compares premain and attach agents, shows how to implement entry points, use Instrumentation and Javassist to transform bytecode, provides complete code samples, packaging instructions, and demonstrates the runtime output with diagrams.
This article explains the concepts, creation methods, usage examples, and internal implementation details of fair and unfair locks in Java's ReentrantLock, comparing their performance characteristics and providing guidance on when to choose each type in multithreaded applications.
This article provides a step‑by‑step guide to building a Spring Boot starter that abstracts object storage services (OSS) via the Amazon S3 protocol, covering dependency selection, configuration properties, template interfaces, implementation, auto‑configuration, packaging, and testing for cloud‑native backend applications.
This article explains how to design a QR‑code login flow, create the necessary database table, define the required APIs, and integrate front‑end JavaScript with a Spring Boot back‑end using WebSocket to notify the client of successful authentication.
This article explains Java thread pools, their performance benefits, and how to create and use FixedThreadPool and CachedThreadPool via the Executors utility, providing code examples, execution results, and guidance on selecting the appropriate pool for different concurrency scenarios.
This article investigates why a large number of quality‑check mappings cause severe latency in a Java service, traces the slowdown to excessive asynchronous log printing, explains the Disruptor‑based async logger internals, evaluates stack‑trace location handling and JNI overhead, and proposes practical configuration and code‑level fixes.
LeetCode 34 asks for the first and last indices of a target in a non‑decreasing integer array, returning [-1,-1] when absent, and can be solved in O(log n) time by applying two binary‑search passes—one locating the leftmost occurrence and the other the rightmost—illustrated with Java, C++, and Python implementations.
This article explains why manual if‑statement checks are problematic, introduces Spring Boot's built‑in validation using Hibernate Validator annotations, shows how to handle errors globally, and covers advanced techniques such as group validation and custom constraint annotations for clean, maintainable backend code.
This article presents a comprehensive guide to efficiently exporting millions of rows to Excel using EasyExcel, covering performance bottlenecks, resource consumption, asynchronous processing, thread‑pool design, batch querying, streaming writes, and practical code examples to achieve fast, memory‑friendly report generation.
This article demonstrates how to move authentication from the gateway to downstream microservices in a Spring Cloud Alibaba setup by disabling the gateway’s ReactiveAuthorizationManager, defining three custom security annotations, creating an AOP aspect to enforce them, and showing practical usage examples with role‑based access control and Feign calls.
This article explains the fundamentals and implementation of a Nacos service registry in a Spring Cloud microservice architecture, covering registration concepts, building a standalone Nacos server, creating provider and consumer services, and deep-diving into the underlying registration code and HTTP interactions.
This article explains the motivations for adopting Prometheus, introduces its core components and metric types, and demonstrates how comprehensive monitoring of business‑critical data, failure events, QPS, latency, and underlying resources can improve system stability and accelerate fault response.
This article details a real‑world case where Spring Boot microservices on a 64 GB server consumed excessive memory, explains how to diagnose the issue using jps and jmap, discusses default JVM heap settings, and provides practical recommendations for tuning JVM parameters to prevent similar problems.
This article presents twelve practical MyBatis‑Plus optimization techniques—including avoiding isNull checks, specifying select fields, batch operations, using EXISTS, safe ordering, type‑safe Lambda queries, handling nulls, performance tracking, enum mapping, logical deletion, optimistic locking, and increment/decrement methods—to improve code readability, maintainability, and database query performance.
This article explains how to implement runtime switching of multiple service providers in a Spring‑based backend by configuring the active implementation in a central store and using the spring‑smart‑di library's AutowiredProxySPI to inject the appropriate bean automatically.
This article explains why tasks submitted with submit() in a Java thread pool silently swallow exceptions, contrasts it with execute(), and presents three practical solutions—including try‑catch, a default UncaughtExceptionHandler, and overriding afterExecute—to reliably capture and handle those errors.
This article explains why Java code style standards are essential for team collaboration, reviews major guidelines such as Google Java Style and Alibaba's p3c, and provides step‑by‑step instructions for configuring IntelliJ IDEA, Checkstyle, and Maven to enforce consistent, readable, and maintainable Java code.
This article explains why overusing Spring's @Autowired can lead to hidden dependencies, tight coupling, NullPointerExceptions, and testing difficulties, and demonstrates how constructor injection provides clearer, safer, and more test‑friendly dependency management.
This article presents a detailed, step‑by‑step guide on improving unit test coverage in large Java codebases, covering strategies such as mocking, divide‑and‑conquer, tool‑assisted test generation, reflection‑based coverage, Maven configuration, and practical tips for handling static methods, final classes, and test data replay.
The article offers practical advice on deciding whether to resign without a new job, emphasizing health, financial stability, and mindset, and then outlines the essential technical knowledge and interview expectations for Java developers with around two years of experience.
This article provides a thorough step‑by‑step guide to using Maven for Java backend projects, covering repository configuration, basic POM structure, dependency inclusion and exclusion, module management, unified dependency handling, essential plugins such as jar, assembly and shade, and detailed build settings with code examples.
This article explains Java enums introduced in Java 5, shows how to define simple and complex enum types, demonstrates their use in comparisons, switch statements, collections like EnumSet and EnumMap, and illustrates applying enums to design patterns such as Singleton and Strategy, while providing practical code examples and JSON serialization techniques.
This article explains critical pitfalls and best‑practice guidelines for employing Spring Event in Java backend applications, covering graceful shutdown requirements, event loss during startup, suitable business scenarios, reliability enhancements, retry mechanisms, idempotency, and the relationship between Spring Event and message queues.
This article explains how to automatically embed userId and orderId into log statements by defining log placeholders, storing these values in MDC via ThreadLocal, and using a custom @UserLog annotation together with Spring AOP to inject the data before method execution, complete with configuration and test examples.
This article provides a detailed tutorial on Maven, covering its basic configuration, repository setup, dependency management (including scopes, exclusions, and version variables), multi‑module organization, unified dependency management, and common build plugins such as jar, assembly, and shade, with complete code examples and explanations.
The article explains how to encapsulate asynchronous notification signature verification in Spring MVC by creating a custom annotation and argument resolver, discusses why aspects and @RequestBody are unsuitable, and presents an alternative unified notification handling design using a service interface and dynamic implementation loading.
This article explains three common ways to create multithreaded Java programs—extending Thread, implementing Runnable, and using Lambda expressions—providing step‑by‑step instructions, code samples, console output, and a summary of each method’s advantages and appropriate use cases.
An extensible asynchronous processing SDK is presented, leveraging Spring transaction events, Kafka queues, XXL‑Job scheduling, and a non‑intrusive architecture to ensure high performance, data safety, and eventual consistency while simplifying integration across Java backend services.
Distributed locks synchronize multiple services across nodes, and can be implemented using Redis’s fast, AP‑oriented SET‑NX with automatic TTL renewal or Zookeeper’s CP‑oriented ephemeral sequential nodes, each offering distinct trade‑offs in performance, consistency, and suitability for various workload requirements.
This article explains the concepts and models of Role‑Based Access Control (RBAC), demonstrates how to configure RBAC permissions in Spring Security, and provides step‑by‑step Java code for integrating JWT authentication, password encryption, and custom login filters for secure backend development.
This article explains how to build a scalable, maintainable permission control framework in Java by defining custom annotations, designing relational database tables, and using Spring AOP to intercept method calls for organization‑level, personal, limit, and special‑role checks, while providing implementation details and best‑practice recommendations.
A senior architect introduced a high‑concurrency monitoring feature that used a ConcurrentHashMap without proper equals/hashCode implementations, leading to duplicate keys, race conditions, and severe memory leaks, which were later resolved by correcting the key class and applying atomic map operations.
This article examines common problems in Spring Boot controller implementations—excessive try‑catch blocks, inline validation, and business logic leakage—and demonstrates how to refactor them using @Valid, assertion utilities, and a global exception handler to achieve concise, maintainable backend code.
This article explains the concept of plugin-based development, outlines its benefits such as module decoupling and extensibility, and provides detailed Java implementations using ServiceLoader, custom configuration files, dynamic JAR loading, and Spring Boot's spring.factories mechanism with complete code examples.
Java's ThreadPoolExecutor provides four built‑in RejectedExecutionHandler strategies—AbortPolicy, CallerRunsPolicy, DiscardPolicy, and DiscardOldestPolicy—each suited to different overload scenarios, and this article explains their behavior, trigger conditions, and practical application guidelines for robust backend concurrency management.
This article documents the diagnosis of slow SpringBoot startup in a large‑scale advertising platform and presents a series of optimizations—including actuator monitoring, Tomcat TLD scan disabling, HBase async warm‑up, custom BeanPostProcessor timing, asynchronous JSF consumer refer, Tomcat version tuning, and hardware migration—that together reduce launch time by about 60%.
The article introduces the latest Cool Request IDEA plugin update, detailing its Trace capability for method execution timing, selective MyBatis function monitoring, customizable slow‑method highlighting, and scripting support for headers and JSON parsing, all illustrated with Java code examples.
The article explains how to troubleshoot extreme CPU usage in MySQL and Java processes, detailing step‑by‑step diagnostics with top, show processlist, jstack, and practical fixes such as adding missing indexes, disabling slow logs, using caches, and correcting busy‑loop code to bring CPU consumption back to normal levels.
This article explains the purpose, typical usage scenarios, and provides concrete code demonstrations of Java's CountDownLatch and CompletableFuture, comparing their synchronization versus asynchronous capabilities and guiding developers on selecting the appropriate tool for effective multithreaded programming.
A developer team debates whether to store monetary amounts as BigDecimal or long, discussing experience‑based preferences, past incidents, and asking the community for real‑world pitfalls of each approach.
This article provides a comprehensive overview of Java's ScheduledThreadPoolExecutor, covering its fundamental concepts, inheritance, key features, construction options, core scheduling methods, configuration recommendations, common pitfalls, and practical code examples for reliable task scheduling in backend applications.
This article introduces UniHttp, a declarative HTTP client framework that simplifies third‑party API integration in Java backend applications by replacing manual HttpClient/OkHttp code with annotated interfaces, provides quick‑start instructions, detailed annotation usage, lifecycle hooks, custom channel integration examples, and configuration tips.
This article explains how to leverage Spring's TransactionSynchronizationManager to detect active transactions and register synchronization callbacks so that Kafka messages are sent asynchronously only after a transaction successfully commits, ensuring data consistency without impacting the main business flow.
This article explains four techniques—manual setting, TaskDecorator, InheritableThreadLocal, and TransmittableThreadLocal—for propagating context such as user information from a parent thread to child threads in Spring Boot asynchronous execution, providing code examples and recommendations.
This article provides a detailed walkthrough of EasyRules' source code, covering its modular project structure, the Facts container, Rule definition, registration via dynamic proxies, the two engine implementations, and the step‑by‑step fire process that drives rule evaluation and execution.
This article introduces the basics of Java multithreading concurrency, explains the difference between concurrency and parallelism with a supermarket analogy, and details thread pool creation, usage, and customization through analysis of ThreadPoolExecutor source code.
This comprehensive guide introduces RocketMQ's architecture, compares it with RabbitMQ and Kafka, outlines typical use cases, explains key concepts such as producers, brokers, consumers, topics, tags, and offsets, and provides complete Java code examples for building producers and consumers.
This article explains Java's Service Provider Interface (SPI), compares it with traditional APIs, and provides a step‑by‑step guide with Maven project setup, code examples, custom class loader, and Spring Boot integration to build a modular plugin system.
This article examines how a Java web application connects to a MySQL database, measuring each step of the TCP handshake, authentication, and setup with Wireshark, and demonstrates that a single connection can take over 200 ms, highlighting the importance of connection pooling.
This guide explains why logging is essential for Java applications, compares popular logging frameworks such as Logback, Log4j2, and SLF4J, shows how to integrate them with Spring Boot, and provides concrete best‑practice recommendations for levels, formatting, async handling, rotation, and security.
The article walks through the problems of hard‑coded if‑else logic, introduces rule engines as a flexible solution, explains EasyRule’s concepts, advantages, and classifications, and provides step‑by‑step Java examples using annotations, fluent API, MVEL, and YAML configurations.
This article explains how to integrate Spring Boot with the open‑source XXL‑Job distributed task scheduler, covering XXL‑Job fundamentals, configuration of the admin console and executor, Maven dependencies, property settings, code examples, @XxlJob annotation parameters, best practices, and includes additional promotional material.
This comprehensive tutorial explains RBAC concepts and models, demonstrates basic Spring Security setup, shows how to integrate JWT for stateless authentication, covers JSON‑based login, password encryption with BCrypt, and database‑backed authentication, providing full code examples for each step.
This article explains Hadoop’s core concepts using a library analogy, details HDFS storage and MapReduce processing, provides complete Java implementations for a word‑count job with support for text, CSV, and JSON inputs, and discusses extensibility and performance optimizations such as combiners and custom partitioners.
The article investigates a severe performance bottleneck in a Java service caused by massive async Log4j2 logging, analyzes the Disruptor‑based async logger, explores JNI stack‑trace overhead, reproduces the issue with benchmarks, and provides practical recommendations to eliminate the slowdown.
This article explains the concepts, key features, internal implementation, and practical usage of Java's ReentrantReadWriteLock, illustrating how read and write locks interact, how fairness and lock downgrading work, and provides a complete code example with multithreaded readers and writers.
This article presents a set of ten Java Stream‑based utility methods that simplify converting between Collection, List, Set, and Map types, showing practical examples, test cases, and reusable implementations for common data‑mapping scenarios.
This article explains how Playwright can automate the UI testing of a car‑insurance H5 application, covering background challenges, tool installation, recording test cases, API response verification, building a full automated testing pipeline, and a demo that reduces manual effort while improving reliability.
This article explains how to replace invasive manual timing code with a lightweight Java Agent that uses the java.lang.instrument API, ASM bytecode manipulation, and Attach/Arthas tools to automatically measure method execution time and perform dynamic class transformation at runtime.
This article walks through a systematic approach to sizing and configuring JVM parameters—including heap size, young generation, GC algorithm selection, and advanced options—for a high‑traffic login service that processes one million requests per day on a server with 8 GB of memory, while explaining the underlying performance‑analysis methodology.
This article demonstrates how to implement a login attempt limiting mechanism using Spring Boot, Redis, and Lua scripts, explaining the problem of repeated password failures, the design of IP-based rate limiting, and providing complete front‑end and back‑end code examples with configuration details.
This guide walks you through the entire Mall‑Swarm microservices e‑commerce project—covering setup, core Spring Cloud components, scaffolding, Kubernetes deployment, and extending functionality—so newcomers can confidently tackle a real‑world microservice system.
The article examines the implementation of inferred spans as an advanced observability technique that enriches traditional distributed tracing by automatically generating additional spans, improving coverage, pinpointing latency sources, and offering performance‑optimisation insights while discussing practical integration, algorithmic details, and associated trade‑offs.
This article introduces MyBatis-Plus, an enhancement library for MyBatis, outlines its major advantages, explains performance‑analysis and advanced plugins, and provides a step‑by‑step tutorial with code examples for integrating, configuring, and using the framework in Java Spring Boot projects.
This article enumerates fifteen common SpringBoot startup extension points, explains their positions in the bean lifecycle, illustrates each with concrete code snippets and usage scenarios, and provides a visual call‑order diagram to help developers harness these hooks for custom initialization and middleware development.
The author recounts a four‑year journey from UI automation to Java‑based performance testing, illustrating how mastering Java’s concurrency utilities and Groovy scripting can replace traditional tools like JMeter, enabling flexible, high‑throughput test scenarios and deeper control over test case design.
This article summarizes how to correctly declare, monitor, configure, and name Java thread pools, explains common mistakes such as unbounded queues and ThreadLocal contamination, and introduces dynamic tuning techniques and open‑source solutions for robust backend concurrency management.
This article presents a comprehensive design of a high‑performance, fault‑tolerant message notification system, covering service partitioning, system architecture, idempotent processing, dynamic error detection, thread‑pool management, retry mechanisms, and stability measures such as traffic‑spike handling, resource isolation, third‑party protection, monitoring, and active‑active deployment.
This article explains the fundamentals of distributed systems, introduces Apache Kafka's architecture and components, discusses how Kafka ensures ordered message consumption, and provides Java consumer configuration tips to maintain message order, offering practical guidance for backend developers working with streaming data.
This article provides a comprehensive overview of Spring's built‑in utility classes—including assertion, string, collection, object, file/resource, web, reflection, AOP, path‑matching, and ID generation helpers—illustrating their usage with code examples and highlighting how they improve development efficiency and code quality.
The article shares a Java backend developer’s recent challenges—including duplicated configuration files, hard‑coded parameters, mixed logging practices, unchecked Maven dependencies, and production database inconsistencies—and offers practical solutions such as consolidating Spring configuration, standardizing logging, enforcing code reviews, and proper Maven pom handling.
This article demonstrates how to replace invasive manual timing code with Java Agent‑based instrumentation, covering the use of java.lang.instrument, premain and agentmain methods, dynamic class retransformation via the Attach API, and practical examples including method‑level timing, runtime class modification, and integration with Arthas for tracing.
This article demonstrates how to encapsulate EasyExcel within a Spring Boot + MyBatis‑Plus project, providing step‑by‑step usage, complete source code, and solutions to common issues such as date formatting, POI version compatibility, and template‑based export limitations.
This article demonstrates how to wrap the EasyExcel library in a Spring Boot + MyBatis‑Plus project, providing a unified component that simplifies Excel import and export through concise annotations, reusable service methods, and customizable converters while addressing common pitfalls such as date handling and template support.
This article compares coroutines and threads for high‑concurrency and I/O‑intensive workloads, summarizes multithreading fundamentals, presents performance‑critical code examples, and discusses JVM memory, locking, middleware, and various optimization techniques for backend systems.
This article compares coroutines and threads for high‑concurrency and I/O‑intensive workloads versus CPU‑bound tasks, discusses Kotlin coroutine adoption, presents multithreading fundamentals, highlights performance pitfalls like System.currentTimeMillis, and offers code examples and optimization strategies for backend developers.
This article explains the conditions that trigger Java thread‑pool rejection policies, describes the four built‑in policies (AbortPolicy, CallerRunsPolicy, DiscardPolicy, DiscardOldestPolicy), provides detailed code examples for each, and discusses suitable application scenarios for backend developers.
mica-mqtt is a simple, low-latency, high-performance open-source MQTT component built on Java AIO, supporting MQTT v3.1, v3.1.1, v5.0, WebSocket, HTTP API, client/server modes, clustering via Redis Stream, and easy integration with Spring Boot, Solon, and JFinal for diverse IoT and messaging scenarios.
This article introduces GroovyShell, a powerful Groovy tool for runtime script execution, and provides five practical code examples—including basic usage, variable passing, multi‑line scripts, external script loading, and context control—followed by key application scenarios such as rule engines, dynamic configuration, rapid debugging, and data processing.
