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Latest from Java Companion

99 recent articles

Java Companion

Jan 3, 2026 · Cloud Native

Ditch the Bulky XXL‑Job? Try This Elegant Nacos‑Based Scheduling Solution

The article analyzes the friction between XXL‑Job and Nacos in cloud‑native environments, proposes the JobFlow design that removes redundant registration and configuration, adds full‑traceability, true sharding with distributed locks, smart retries and cloud‑native configuration, and demonstrates how these changes improve consistency, observability and operational cost.

Cloud NativeJobFlowMicroservices

0 likes · 19 min read

Ditch the Bulky XXL‑Job? Try This Elegant Nacos‑Based Scheduling Solution

Java Companion

Dec 31, 2025 · Backend Development

Implementing a Production‑Ready Idempotency Middleware with Spring Boot and Redis

This article explains how to build a lightweight, production‑grade idempotency middleware for Spring Boot 3 using AOP, a custom @Idempotent annotation, SpEL‑generated keys, and Redis atomic operations, covering architecture, core components, code examples, use cases, and performance characteristics.

AOPIdempotencyJava

0 likes · 8 min read

Implementing a Production‑Ready Idempotency Middleware with Spring Boot and Redis

Java Companion

Dec 29, 2025 · Backend Development

Avoid OOM: EasyExcel Best Practices for Exporting Millions of Rows (with Ready‑to‑Use Helper)

This article explains why exporting large Excel files with EasyExcel can cause OOM, CPU blockage, and slow responses, and demonstrates a pagination‑query plus batch‑write solution with reusable helper classes, performance benchmarks, dynamic page sizing, async export, multi‑sheet and template techniques, and a concise best‑practice checklist.

AsyncJavaPerformance

0 likes · 15 min read

Avoid OOM: EasyExcel Best Practices for Exporting Millions of Rows (with Ready‑to‑Use Helper)

Java Companion

Dec 28, 2025 · Backend Development

SpringBoot vs Nginx: Five Implementation Options vs One Directive – Which Is the True Anti‑Hotlinking Champion?

An in‑depth comparison of anti‑hotlinking techniques shows how Nginx can enforce protection with a single directive in milliseconds, while SpringBoot offers five approaches—Filter, Interceptor, Nginx config, signed URL, and hybrid strategy—each with different performance, security, and maintenance trade‑offs.

InterceptorPerformanceSigned URL

0 likes · 14 min read

SpringBoot vs Nginx: Five Implementation Options vs One Directive – Which Is the True Anti‑Hotlinking Champion?

Java Companion

Dec 27, 2025 · Cloud Native

Is Minio Turning Paid? 5 Free Distributed Storage Alternatives You Should Consider

The article explains Minio's recent licensing shift to AGPLv3, why it matters for SaaS and proprietary software vendors, and presents five open‑source distributed storage systems—SeaweedFS, Garage, Ceph, GlusterFS, and OpenStack Swift—detailing their licenses, deployment complexity, performance characteristics, and suitable use cases.

CephGlusterFSMinio

0 likes · 21 min read

Is Minio Turning Paid? 5 Free Distributed Storage Alternatives You Should Consider

Java Companion

Dec 25, 2025 · Backend Development

Druid Crashed in Production? How to Optimize the Spring Boot Connection Pool

The article explains why Druid can fail in a live Spring Boot service and provides a comprehensive, step‑by‑step optimization guide covering core pool parameters, monitoring setup, security hardening, leak detection, dynamic tuning, and best‑practice pitfalls to achieve stable, high‑performance database connections.

Connection PoolDruidJava

0 likes · 12 min read

Druid Crashed in Production? How to Optimize the Spring Boot Connection Pool

Java Companion

Dec 23, 2025 · Backend Development

Three Spring Async Streaming APIs to Eliminate Timeout Issues

This article explains how to handle long‑running Spring endpoints by using three asynchronous streaming tools—ResponseBodyEmitter, SseEmitter, and StreamingResponseBody—showing their appropriate scenarios, configuration details, and complete code examples that keep the servlet thread free and avoid timeout problems.

AsyncResponseBodyEmitterSseEmitter

0 likes · 9 min read

Three Spring Async Streaming APIs to Eliminate Timeout Issues

Java Companion

Dec 21, 2025 · Backend Development

Eliminate Messy Login Logic: Unified Multi‑Channel Authentication with Spring Boot Factory & Strategy Patterns

This article demonstrates how to replace tangled if‑else login code with a clean Spring Boot solution that combines the Factory and Strategy patterns, enabling easy addition of multiple authentication methods such as password, WeChat, SMS, and future providers while improving extensibility, readability, and testability.

AuthenticationFactory PatternJava

0 likes · 12 min read

Eliminate Messy Login Logic: Unified Multi‑Channel Authentication with Spring Boot Factory & Strategy Patterns

Java Companion

Dec 19, 2025 · Backend Development

Spring ApplicationEvent Listeners: A Lightweight Asynchronous Alternative to MQ

This article explains how Spring ApplicationEvent listeners can replace heavyweight message queues for high‑traffic scenarios, showing event class design, publishing and handling code, real‑world performance data, common pitfalls, and best‑practice guidelines for reliable asynchronous processing.

ApplicationEventBest PracticesEventListener

0 likes · 9 min read

Spring ApplicationEvent Listeners: A Lightweight Asynchronous Alternative to MQ

Java Companion

Dec 18, 2025 · Backend Development

Building a High‑Performance Sensitive‑Word Filter with SpringBoot and DFA

This article explains why traditional string‑search and regex methods struggle with large keyword sets, introduces the deterministic finite automaton (DFA) approach using a Trie structure for linear‑time matching, provides full Java implementations, and discusses real‑world applications and advanced optimizations such as double‑array Tries, Aho‑Corasick, and sharding with Bloom filters.

DFAJavaSensitiveWordFilter

0 likes · 17 min read

Building a High‑Performance Sensitive‑Word Filter with SpringBoot and DFA