Author

Java Architect Handbook

Focused on Java interview questions and practical article sharing, covering algorithms, databases, Spring Boot, microservices, high concurrency, JVM, Docker containers, and ELK-related knowledge. Looking forward to progressing together with you.

148

Articles

Likes

427

Views

Comments

Latest from Java Architect Handbook

100 recent articles max

Java Architect Handbook

Jun 8, 2026 · Fundamentals

What’s the Relationship Between the JVM Runtime Constant Pool and the String Constant Pool?

This article explains the three Java constant pools—class file, runtime, and string—detailing their evolution from compilation to execution, their memory locations across JDK versions, how string literals are interned, code examples illustrating their behavior, common misconceptions, and typical interview follow‑up questions.

Constant PoolJVMJava

0 likes · 15 min read

What’s the Relationship Between the JVM Runtime Constant Pool and the String Constant Pool?

Java Architect Handbook

Jun 6, 2026 · Backend Development

Spring Cloud LoadBalancer vs Ribbon: Key Differences and Why Ribbon Was Replaced

The article explains the functional and architectural differences between Spring Cloud LoadBalancer and Netflix Ribbon, why Ribbon entered maintenance mode and was replaced, outlines migration steps, compares configuration, caching, reactive support, and provides code examples and common interview questions for Java developers.

Client-side load balancingJavaLoadBalancer

0 likes · 12 min read

Spring Cloud LoadBalancer vs Ribbon: Key Differences and Why Ribbon Was Replaced

Java Architect Handbook

Jun 5, 2026 · Artificial Intelligence

What Is Embedding in RAG and Why Does It Use 1536 Dimensions?

The article explains that embedding converts text into a 1536‑dimensional floating‑point vector that serves as a semantic fingerprint, describes how the vector is generated, why 1536 dimensions are chosen, how similarity is measured, and provides Java Spring AI code examples along with model‑selection guidance and common interview pitfalls.

DimensionEmbeddingOpenAI

0 likes · 16 min read

What Is Embedding in RAG and Why Does It Use 1536 Dimensions?

Java Architect Handbook

Jun 4, 2026 · Backend Development

Zero‑Downtime Code Updates in Spring Boot by Sharing a Single Port

The article explains how to update a Spring Boot application without stopping the service by letting two processes share the same port, detailing the underlying Tomcat and ServletContainerInitializer mechanisms, the step‑by‑step implementation, and a demo that shows sub‑second downtime during hot swaps.

JavaServletSpringBoot

0 likes · 10 min read

Zero‑Downtime Code Updates in Spring Boot by Sharing a Single Port

Java Architect Handbook

Jun 3, 2026 · Artificial Intelligence

What Is Retrieval‑Augmented Generation (RAG) and Why It Matters for LLM Interviews

The article explains Retrieval‑Augmented Generation (RAG), why large language models suffer from hallucination, knowledge cutoff, domain gaps and traceability issues, and how RAG’s offline‑online pipeline, comparison with fine‑tuning and long‑context approaches, and emerging trends like Agentic and Graph‑RAG can be discussed in technical interviews.

AI interviewLarge Language ModelRAG

0 likes · 12 min read

What Is Retrieval‑Augmented Generation (RAG) and Why It Matters for LLM Interviews

Java Architect Handbook

Jun 1, 2026 · Backend Development

Why Is RPC Faster Than HTTP? An In‑Depth Comparison for Interviews

The article explains that RPC outperforms traditional HTTP/1.1 + JSON because of a slimmer binary protocol, faster binary serialization, persistent long‑connection reuse, and an efficient NIO network model, while noting that HTTP/2 + gRPC narrows the gap.

DubboHTTPNetty

0 likes · 13 min read

Why Is RPC Faster Than HTTP? An In‑Depth Comparison for Interviews

Java Architect Handbook

May 30, 2026 · Interview Experience

What Is IPv6 and How Does It Differ From IPv4? Interview Guide

This article explains IPv6 fundamentals, compares it with IPv4 across address length, header format, security and configuration, and provides interview‑ready insights such as SLAAC auto‑configuration, dual‑stack transition, and common follow‑up questions.

IP protocolIPv4IPv6

0 likes · 13 min read

What Is IPv6 and How Does It Differ From IPv4? Interview Guide

Java Architect Handbook

May 29, 2026 · Interview Experience

CDN Cache vs Redis Cache: Key Differences and Ideal Use Cases (Interview Insight)

The article explains how CDN works as a distributed reverse‑proxy cache, details its DNS‑based load balancing, cache‑hit/miss flow, expiration policies and refresh strategies, compares CDN caching with browser and Nginx caches, outlines scenarios where CDN or Redis is appropriate, and provides typical interview follow‑up questions and practical tips.

CDNCache InvalidationCaching

0 likes · 13 min read

CDN Cache vs Redis Cache: Key Differences and Ideal Use Cases (Interview Insight)

Java Architect Handbook

May 28, 2026 · Fundamentals

What Really Happens When You Hit Enter After Typing a URL?

The article breaks down the complete browser workflow from URL entry to page rendering, covering URL parsing, DNS lookup (recursive and iterative), TCP three‑way handshake, TLS negotiation, HTTP request/response exchange, and the final rendering steps, while also providing interview‑focused Q&A and a memorization mnemonic.

BrowserDNSHTTP

0 likes · 15 min read

What Really Happens When You Hit Enter After Typing a URL?

Java Architect Handbook

May 27, 2026 · Fundamentals

What Triggers Young GC vs. Full GC in Java? Interview Guide

The article explains that Young GC fires when the Eden space is full, while Full GC can be triggered by old‑generation shortage, metaspace exhaustion, allocation‑guarantee failure, or an explicit System.gc() call, and provides interview‑ready answers, diagnostic steps, and a comparison table.

Garbage CollectionJVMJava

0 likes · 14 min read

What Triggers Young GC vs. Full GC in Java? Interview Guide