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The Dominant Programmer
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The Dominant Programmer

Resources and tutorials for programmers' advanced learning journey. Advanced tracks in Java, Python, and C#. Blog: https://blog.csdn.net/badao_liumang_qizhi

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Recent Articles

Latest from The Dominant Programmer

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The Dominant Programmer
The Dominant Programmer
Jun 9, 2026 · Backend Development

Collect URLs and Async Convert to PDF for ZIP Download (Spring Boot + Feign)

An online education platform needs to batch‑download course materials from self‑hosted courses, partner APIs, and archived PDFs; the article details a Spring Boot service that aggregates URLs, signs them, distinguishes direct downloads, submits an asynchronous PDF conversion and ZIP packaging task via Feign, and returns a task ID for front‑end polling.

AsyncPDFSpring Boot
0 likes · 15 min read
Collect URLs and Async Convert to PDF for ZIP Download (Spring Boot + Feign)
The Dominant Programmer
The Dominant Programmer
Jun 7, 2026 · Backend Development

Executing Asynchronous Operations After Spring Transaction Commit: Principles, Pitfalls, and Best Practices

The article explains why sending messages before a Spring transaction commits can cause data inconsistency, and demonstrates how to reliably execute asynchronous actions such as MQ notifications after a successful commit using TransactionSynchronization, custom collectors, and @TransactionalEventListener, while highlighting common pitfalls and mitigation strategies.

MQSpringTransaction
0 likes · 16 min read
Executing Asynchronous Operations After Spring Transaction Commit: Principles, Pitfalls, and Best Practices
The Dominant Programmer
The Dominant Programmer
Jun 6, 2026 · Backend Development

Business Trace Logging Design Pattern: From Theory to Practice

The article explains a structured business‑trace logging pattern that records each critical step of a workflow as a node, stores logs in a dedicated MySQL database, aggregates them by a business number, and presents them in a sortable, color‑coded front‑end for both developers and business users.

MySQLasynchronous messagingbackend design
0 likes · 15 min read
Business Trace Logging Design Pattern: From Theory to Practice
The Dominant Programmer
The Dominant Programmer
Jun 6, 2026 · Backend Development

Mockito Unit Testing: A Complete Guide to Testing Java Service Layers

This article explains unit testing fundamentals, compares unit and integration tests, introduces Mockito's core annotations and APIs, walks through a full order‑resend example with detailed test cases, and covers best‑practice methodologies, advanced techniques, common pitfalls, naming conventions, and how to run the tests.

Given-When-ThenJUnit5Mocking
0 likes · 21 min read
Mockito Unit Testing: A Complete Guide to Testing Java Service Layers
The Dominant Programmer
The Dominant Programmer
Jun 3, 2026 · Backend Development

Building a LangGraph‑Style YAML DSL Workflow Engine with Spring AI

This article walks through constructing a lightweight YAML‑based DSL workflow engine on Spring AI 1.1.2 and Ollama, showing how to define state graphs, register tools, parse and execute nodes—including conditional edges, while loops, and parallel branches—without external orchestration tools.

LangGraphSpring AIparallel processing
0 likes · 17 min read
Building a LangGraph‑Style YAML DSL Workflow Engine with Spring AI
The Dominant Programmer
The Dominant Programmer
Jun 3, 2026 · Backend Development

Building a Minimal Spring AI Tool Chain for Multi-Tool Calls

This tutorial demonstrates how to integrate Spring AI with Ollama, define @Tool‑annotated weather and translation utilities, register them for automatic chaining, and let a large language model answer queries like “fetch Beijing weather and reply in English” using a concise end‑to‑end example.

OllamaSpring AISpring Boot
0 likes · 8 min read
Building a Minimal Spring AI Tool Chain for Multi-Tool Calls
The Dominant Programmer
The Dominant Programmer
May 28, 2026 · Artificial Intelligence

Spring AI RAG: Concepts, Hands‑On Implementation, and Full Code

This article explains the limitations of large language models, introduces Retrieval‑Augmented Generation (RAG) and its four‑step workflow, details Spring AI's RAG components and vector‑store options, and provides complete, runnable Java code—including Maven, configuration, and service classes—to build a local knowledge‑base Q&A system.

EmbeddingOllamaQuestionAnswerAdvisor
0 likes · 18 min read
Spring AI RAG: Concepts, Hands‑On Implementation, and Full Code
The Dominant Programmer
The Dominant Programmer
May 26, 2026 · Artificial Intelligence

Spring AI ChatMemory: Concepts, Practical Setup, and Common Issues

This guide explains how Spring AI abstracts LLM conversation memory using a three‑layer architecture, demonstrates configuring MessageWindowChatMemory with a sliding‑window strategy, shows two ways to register the memory advisor, and provides complete Maven, YAML, and Java code examples with test screenshots.

ChatMemoryConversation MemoryLLM
0 likes · 9 min read
Spring AI ChatMemory: Concepts, Practical Setup, and Common Issues