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Java Tech Workshop

Focused on Java backend technologies, sharing fundamentals, multithreading, JVM, the Spring ecosystem, microservices, distributed systems, high concurrency, source‑code analysis, and practical experience. Continuously delivers high‑quality original content, interview guides, and learning roadmaps to help Java developers progress from beginner to advanced, enhancing technical skills and core competitiveness.

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Latest from Java Tech Workshop

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Java Tech Workshop

Oct 3, 2026 · Backend Development

LRU Cache in 3 Lines: How LinkedHashMap Does the Heavy Lifting

This article demonstrates how to build a bounded LRU cache in three lines by extending LinkedHashMap with access-order enabled and overriding removeEldestEntry, detailing the internal doubly-linked list mechanics, thread-safety limitations, memory overhead, and when to migrate to Caffeine for advanced features like TTL and high concurrency.

CaffeineJavaLRU cache

0 likes · 22 min read

LRU Cache in 3 Lines: How LinkedHashMap Does the Heavy Lifting

Java Tech Workshop

Oct 2, 2026 · Fundamentals

Frequent Minor GC? The Real Culprits Are Allocation Rate and Premature Promotion

This article explains why frequent Minor GC in Java applications stems from high object allocation rates or premature promotion to old generation, not heap size, and details generational collection mechanics, promotion thresholds, dynamic age judgment, and troubleshooting using jstat, GC logs, and AsyncProfiler to pinpoint allocation hotspots.

Allocation RateAsyncProfilerGC Logs

0 likes · 18 min read

Frequent Minor GC? The Real Culprits Are Allocation Rate and Premature Promotion

Java Tech Workshop

Oct 1, 2026 · Fundamentals

Why Circular References Don't Leak Memory in Java: Reachability Analysis Explained

This article explains how Java's reachability analysis garbage collection handles circular references, contrasts it with reference counting's failure on cycles, details GC roots, three-color marking, finalize() resurrection, and identifies real memory leak patterns caused by lingering root references.

Circular ReferencesFinalizeGC Roots

0 likes · 15 min read

Why Circular References Don't Leak Memory in Java: Reachability Analysis Explained

Java Tech Workshop

Sep 30, 2026 · Backend Development

Java Records vs Lombok @Data: One-Line Replacement Guide

This article compares Java 16 records with Lombok's @Data annotation, detailing generated code differences, a feature comparison table, a Spring Boot migration example, scenarios where records cannot replace @Data, and key caveats including immutability constraints, Jackson deserialization requirements, and mutable collection pitfalls.

0 likes · 18 min read

Java Records vs Lombok @Data: One-Line Replacement Guide

Java Tech Workshop

Sep 29, 2026 · Backend Development

Java Method References: Four Patterns, Readability Tips, and Compiler Resolution Explained

This article explains the four types of Java method references (static, bound instance, arbitrary instance, constructor), their equivalent lambdas, compiler overload resolution, readability trade-offs, and practical examples showing when method references improve clarity versus when lambdas remain preferable.

Best PracticesCode ReadabilityCompiler Overload Resolution

0 likes · 21 min read

Java Method References: Four Patterns, Readability Tips, and Compiler Resolution Explained

Java Tech Workshop

Sep 28, 2026 · Fundamentals

Java Interface Default & Static Methods: Evolution Tool or Maintenance Trap?

This article analyzes Java 8+ interface default and static methods, explaining their original purpose for backward-compatible interface evolution, valid use cases like optional capabilities and mixin-style derived methods, and common pitfalls including hidden assumptions, silent failures, fixed workflows that prevent customization, and binary vs semantic compatibility issues. It includes a real-world refactoring example for payment callback handlers.

Interface Default MethodsInterface EvolutionInterface Static Methods

0 likes · 24 min read

Java Interface Default & Static Methods: Evolution Tool or Maintenance Trap?

Java Tech Workshop

Sep 27, 2026 · Backend Development

Java Stream API in Practice: From 80 Lines to 30 — Deduplication, Grouping, Sorting & Statistics

A hands-on guide demonstrating how Java Stream API reduces a real-world reporting task from 78 lines to 17, covering deduplication strategies, multi-level sorting pitfalls, grouping with downstream collectors, and one-pass statistics using IntSummaryStatistics.

CollectorsComparatorIntSummaryStatistics

0 likes · 23 min read

Java Stream API in Practice: From 80 Lines to 30 — Deduplication, Grouping, Sorting & Statistics

Java Tech Workshop

Sep 26, 2026 · Backend Development

Spring Boot 3 + Spring Security 6 + JWT: Production-Ready Auth & Authorization Guide

This article walks through building a complete JWT-based authentication and authorization system with Spring Boot 3 and Spring Security 6, covering RBAC database design, token issuance and validation, filter chain configuration, permission annotations, refresh tokens, logout blacklisting, and Vue 3 frontend integration.

AuthorizationJWTRBAC

0 likes · 33 min read

Spring Boot 3 + Spring Security 6 + JWT: Production-Ready Auth & Authorization Guide

Java Tech Workshop

Sep 25, 2026 · Backend Development

SpringBoot SSE vs WebSocket: Complete Guide to Server-Sent Events for Unidirectional Push

This article compares SSE and WebSocket for server push, details SpringBoot integration with SseEmitter, WebFlux, and raw HttpServletResponse, provides a production-ready connection manager with heartbeat and clustering via Redis, and demonstrates AI streaming and real-time dashboard use cases.

AI streamingAsync ServletRedis Pub/Sub

0 likes · 29 min read

SpringBoot SSE vs WebSocket: Complete Guide to Server-Sent Events for Unidirectional Push

Java Tech Workshop

Sep 23, 2026 · Backend Development

ValidX in DDD: Layered Validation for Domain Models

This article demonstrates how ValidX, a JSR-380-compliant validation library with 100+ Chinese business validators, integrates into DDD layered architecture, showing annotation-based DTO validation, chain-style API for value objects, aggregate roots, and domain services, with code examples for each layer and best practices for avoiding common pitfalls.

Aggregate RootDDDDomain Service

0 likes · 20 min read

ValidX in DDD: Layered Validation for Domain Models