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Code Ape Tech Column

Former Ant Group P8 engineer, pure technologist, sharing full‑stack Java, job interview and career advice through a column. Site: java-family.cn

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Latest from Code Ape Tech Column

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Code Ape Tech Column

Sep 26, 2025 · Backend Development

Why FastJSON Calls isChinaName() During Serialization and How to Fix It

An unexpected NullPointerException occurs when adding a simple log line to a Java DTO, revealing that FastJSON’s serialization process invokes methods like isChinaName(), getXxx(), and isXxx() via ASM-generated serializers, and the article explains the underlying mechanism, common pitfalls, and best‑practice annotations to avoid such bugs.

ASMAnnotationsFastJSON

0 likes · 7 min read

Why FastJSON Calls isChinaName() During Serialization and How to Fix It

Code Ape Tech Column

Sep 25, 2025 · Backend Development

How a Dynamic Rule Engine Can Cut Deployment Time from Hours to Minutes

This article explains how separating business rules from code using a dynamic rule engine—implemented with Spring Boot, QLExpress, and a simple HTML/Tailwind front‑end—enables rapid, low‑risk rule changes for e‑commerce, finance, and content platforms, illustrated with full code examples and real‑world scenarios.

BackendBusiness RulesDynamic Rule Engine

0 likes · 14 min read

How a Dynamic Rule Engine Can Cut Deployment Time from Hours to Minutes

Code Ape Tech Column

Sep 24, 2025 · Backend Development

How xxl-job Leverages Netty and Dynamic Proxies for High‑Performance RPC

This article explains how xxl‑job uses Netty HTTP, dynamic proxies, and fully asynchronous processing to implement a high‑throughput RPC mechanism, detailing the communication layer, overall workflow, and the clever design that wraps async calls into synchronous‑looking code.

Dynamic proxyJavaRPC

0 likes · 7 min read

How xxl-job Leverages Netty and Dynamic Proxies for High‑Performance RPC

Code Ape Tech Column

Sep 23, 2025 · Backend Development

Integrate Tess4J OCR into Spring Boot: Step‑by‑Step Guide

This tutorial walks you through setting up a Spring Boot project with Tess4J, adding required dependencies, configuring language data, implementing an OCR service and REST controller, and testing both local file and remote URL image recognition, all with complete code examples.

Image processingJavaOCR

0 likes · 6 min read

Integrate Tess4J OCR into Spring Boot: Step‑by‑Step Guide

Code Ape Tech Column

Sep 22, 2025 · Backend Development

How to Build an Elegant Java TimeTracker with AutoCloseable and Lambdas

This article explains how to design a lightweight, flexible Java TimeTracker utility that leverages AutoCloseable, try‑with‑resources, functional interfaces and lambda expressions to simplify performance monitoring, support automatic exception handling, and provide extensible features for real‑world backend development.

Lambdaautocloseableperformance monitoring

0 likes · 13 min read

How to Build an Elegant Java TimeTracker with AutoCloseable and Lambdas

Code Ape Tech Column

Sep 20, 2025 · Databases

What New SQL Features Did SQLite Add in 2018? A Deep Dive

This article explores SQLite's 2018 enhancements—including boolean literals, window functions, FILTER clauses, upsert syntax, and column renaming—detailing how each feature works, its syntax, and practical code examples, while also clarifying limitations compared to other major database systems.

Boolean LiteralsDatabase FeaturesFILTER clause

0 likes · 10 min read

What New SQL Features Did SQLite Add in 2018? A Deep Dive

Code Ape Tech Column

Sep 19, 2025 · Backend Development

Sentinel Deep Dive: Flow Control, Circuit Breaking & Rate Limiting

This comprehensive tutorial introduces Alibaba Sentinel, explaining its core concepts, installation, configuration of flow control, degradation, hotspot parameters, system adaptive limits, black‑white lists, persistence with Nacos, cluster flow control, and advanced customization techniques such as custom block handlers and fallback strategies for resilient microservice architectures.

Circuit BreakingFlow ControlMicroservices

0 likes · 39 min read

Sentinel Deep Dive: Flow Control, Circuit Breaking & Rate Limiting

Code Ape Tech Column

Sep 18, 2025 · Backend Development

Master Traffic Coloring & Gray Release with Spring Cloud Gateway

This article explains how to use Spring Cloud Gateway for traffic coloring and gray release, enabling you to tag requests, route VIP or test traffic to new service versions gradually, and ensure safe, controlled rollouts in production environments.

BackendGray ReleaseMicroservices

0 likes · 14 min read

Master Traffic Coloring & Gray Release with Spring Cloud Gateway

Code Ape Tech Column

Sep 17, 2025 · Backend Development

8 Powerful Ways to Implement Asynchronous Processing in Java

Explore eight practical techniques for achieving asynchronous execution in Java—from low‑level threads and Futures to Spring’s @Async, ApplicationEvent, message queues, and Guava ListenableFuture—complete with code samples, performance insights, and best‑practice recommendations for building responsive backend services.

FutureJavaMessage Queue

0 likes · 13 min read

8 Powerful Ways to Implement Asynchronous Processing in Java

Code Ape Tech Column

Sep 15, 2025 · Backend Development

Unlock Ultra‑Fast Messaging with Disruptor: A Hands‑On Java Guide

This article introduces the high‑performance Disruptor library, explains its core concepts such as Ring Buffer, Sequence, and Wait Strategy, and provides a step‑by‑step Java demo—including Maven setup, event model, producer, consumer, and test—showcasing how to build a lock‑free in‑memory message queue.

Concurrent ProgrammingDisruptorJava

0 likes · 11 min read

Unlock Ultra‑Fast Messaging with Disruptor: A Hands‑On Java Guide