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Java Backend Technology

Focus on Java-related technologies: SSM, Spring ecosystem, microservices, MySQL, MyCat, clustering, distributed systems, middleware, Linux, networking, multithreading. Occasionally cover DevOps tools like Jenkins, Nexus, Docker, and ELK. Also share technical insights from time to time, committed to Java full-stack development!

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Latest from Java Backend Technology

100 recent articles max

Java Backend Technology

Jul 18, 2025 · Backend Development

Why Did My New Java Developer Trigger NPE? Lessons & Fixes

A new Java developer caused a production NullPointerException while matching third‑party data, and the article walks through reproducing the bug, analyzing each faulty line, and applying defensive programming techniques such as early returns, Optional, Objects.equals, and collection checks to prevent similar crashes.

NullPointerExceptionObjects.equalsOptional

0 likes · 6 min read

Why Did My New Java Developer Trigger NPE? Lessons & Fixes

Java Backend Technology

Jul 15, 2025 · Operations

How I Rescued a Production Server After a Fatal rm -rf Mistake

This article recounts a disastrous production server data loss caused by an accidental rm -rf command, details the step‑by‑step recovery using ext3grep, extundelete and MySQL binlog, and shares hard‑earned lessons to prevent similar incidents.

BackupData RecoveryMySQL

0 likes · 10 min read

How I Rescued a Production Server After a Fatal rm -rf Mistake

Java Backend Technology

Jul 14, 2025 · Backend Development

Mastering Rate Limiting: 4 Proven Strategies to Boost System Resilience

This article explores four common rate‑limiting algorithms—fixed window, sliding window, leaky bucket, and token bucket—explains their core principles, shows Java and Redis implementations, discusses real‑world production cases, and provides practical tips for avoiding pitfalls and optimizing performance.

Rate LimitingRedis

0 likes · 10 min read

Mastering Rate Limiting: 4 Proven Strategies to Boost System Resilience

Java Backend Technology

Jul 10, 2025 · Backend Development

Unlock Spring’s Power: Global Exception Handling, Custom Interceptors, and Thread‑Local Scopes

Explore Spring’s extensibility by mastering global exception handling with @RestControllerAdvice, creating custom MVC interceptors, accessing the container via BeanFactoryAware, importing configurations, adding startup logic, modifying BeanDefinitions, using initialization callbacks, and defining a thread‑local custom scope for per‑thread bean instances.

ApplicationRunnerBean LifecycleCustom Scope

0 likes · 10 min read

Unlock Spring’s Power: Global Exception Handling, Custom Interceptors, and Thread‑Local Scopes

Java Backend Technology

Jul 8, 2025 · Backend Development

ThreadLocal vs ScopedValue: Why ScopedValue Is the New King in Java Concurrency

ThreadLocal has long served as Java’s go‑to tool for thread‑local data, but its memory‑leak risks and performance penalties become pronounced with virtual threads, while the newer ScopedValue offers automatic cleanup, immutable safety, and superior efficiency, making it a compelling replacement in high‑concurrency scenarios.

ConcurrencyScopedValueThreadLocal

0 likes · 12 min read

ThreadLocal vs ScopedValue: Why ScopedValue Is the New King in Java Concurrency

Java Backend Technology

Jul 7, 2025 · Backend Development

Master Dynamic JSON Fields in Java with @JsonAnyGetter and @JsonAnySetter

This article explains how Jackson's @JsonAnySetter and @JsonAnyGetter annotations let Java classes gracefully handle unknown JSON properties by collecting them into a map during deserialization and emitting them as regular fields during serialization, complete with practical code examples and usage tips.

AnnotationsDeserializationDynamicProperties

0 likes · 7 min read

Master Dynamic JSON Fields in Java with @JsonAnyGetter and @JsonAnySetter

Java Backend Technology

Jul 3, 2025 · Backend Development

Automate Common Fields in Java Order Modules with MyBatis‑Plus, AOP & JWT

This article presents a production‑tested, six‑strategy solution—including MyBatis‑Plus auto‑fill, AOP, JWT, multi‑datasource handling, distributed ID generation, and audit logging—to eliminate repetitive maintenance of common fields in Java order modules, boosting efficiency and reducing bugs.

AOPJavaSpring

0 likes · 10 min read

Automate Common Fields in Java Order Modules with MyBatis‑Plus, AOP & JWT

Java Backend Technology

Jul 2, 2025 · Backend Development

Generate Spring Boot CRUD Code Instantly with EasyCode Plugin

This tutorial walks you through installing the EasyCode IntelliJ plugin, creating a MySQL database, configuring IDEA’s database connection, setting up Maven dependencies and application.yml, generating entity, DAO, service, and controller code automatically, and finally running the Spring Boot project.

EasyCodeIntelliJ IDEAJava

0 likes · 6 min read

Generate Spring Boot CRUD Code Instantly with EasyCode Plugin

Java Backend Technology

Jul 1, 2025 · Backend Development

How to Link Distributed Logs with TraceId Across Rest, MQ, and RPC in Java

This article explains how to generate a unique traceId at request entry, propagate it through Rest, MQ, and RPC modules using Log4j2, MDC, and custom converters, and format logs so that distributed traces become easily readable and correlated across services.

Javadistributed logginglog4j2

0 likes · 8 min read

How to Link Distributed Logs with TraceId Across Rest, MQ, and RPC in Java

Java Backend Technology

Jun 25, 2025 · Information Security

How to Seamlessly Refresh JWT Tokens: Backend and Frontend Strategies

This article explains why sudden logouts occur due to expired JWT tokens stored in Redis, and presents both backend automatic token renewal and frontend double‑token (access‑token and refresh‑token) approaches, complete with code examples, testing tips, and handling edge cases such as long‑idle form submissions.

Backendauthenticationjwt

0 likes · 10 min read

How to Seamlessly Refresh JWT Tokens: Backend and Frontend Strategies