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Coder Trainee

Experienced in Java and Python, we share and learn together. For submissions or collaborations, DM us.

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Coder Trainee
Coder Trainee
Apr 23, 2026 · Cloud Native

Spring Cloud Microservices in Action Part 2: Implementing Service Registration and Discovery with Nacos

After splitting a monolithic blog into independent services, this article explains how to solve the core problem of locating services by introducing Nacos as a registration center, detailing its installation, configuration, service registration, discovery, load balancing, health‑checking, common pitfalls, and a complete hands‑on example.

NacosSpring Cloudhealth check
0 likes · 14 min read
Spring Cloud Microservices in Action Part 2: Implementing Service Registration and Discovery with Nacos
Coder Trainee
Coder Trainee
Apr 20, 2026 · Artificial Intelligence

How to Install and Configure Ollama Locally for a CRM AI Engine

This guide walks through installing Ollama on Windows 10, downloading a Chinese‑friendly LLM such as Qwen2, configuring a CRM’s application‑dev.yml to point to the local Ollama service, restarting the backend, and handling optional CORS settings, highlighting zero‑cost, privacy, and stability benefits.

AI DeploymentCRM integrationLocal LLM
0 likes · 4 min read
How to Install and Configure Ollama Locally for a CRM AI Engine
Coder Trainee
Coder Trainee
Apr 19, 2026 · Backend Development

How to Optimize Performance and Deploy a Production‑Ready Blog System

This article walks through a complete performance‑optimization and deployment pipeline for a Spring Boot blog, covering multi‑level caching with Caffeine and Redis, database indexing and cursor pagination, read‑write splitting, asynchronous processing, rate limiting, Docker multi‑stage builds, Nginx reverse‑proxy setup, Actuator monitoring, custom metrics, health checks, alerting, JMeter load testing, and JVM tuning.

CaffeineDockerPerformance optimization
0 likes · 17 min read
How to Optimize Performance and Deploy a Production‑Ready Blog System
Coder Trainee
Coder Trainee
Apr 18, 2026 · Backend Development

Building a Tech Blog from Scratch: Implementing a Comment System and Full‑Text Search

This article walks through the design and implementation of a nested comment system with likes, @‑mentions, and sensitive‑word filtering, plus full‑text search using Elasticsearch, covering database schema changes, backend services, Vue components, and recommendation logic for a technical blog platform.

ElasticsearchFull‑Text SearchJava
0 likes · 23 min read
Building a Tech Blog from Scratch: Implementing a Comment System and Full‑Text Search
Coder Trainee
Coder Trainee
Apr 16, 2026 · Backend Development

Building a Tech Blog from Scratch (Part 2): Implementing Login Authentication with Spring Security and JWT

This article walks through creating a complete login authentication system—including registration, login, token refresh, and permission control—by replacing Spring Security's default session handling with JWT, configuring backend filters and utilities, and integrating a Vue 3 + Pinia front‑end with automatic token renewal.

AuthenticationJWTSpring Boot
0 likes · 19 min read
Building a Tech Blog from Scratch (Part 2): Implementing Login Authentication with Spring Security and JWT
Coder Trainee
Coder Trainee
Apr 14, 2026 · Operations

5 Production Nightmares in an Education Mini‑Program and How to Avoid Them

The author recounts five critical production incidents that crippleed an education mini‑program—Redis connection‑pool exhaustion, duplicate bookings, double refunds, mis‑firing no‑show jobs, and inventory oversell—detailing root causes, concrete fixes, and hard‑won lessons for building resilient backend services.

IdempotencyMySQLRedis
0 likes · 10 min read
5 Production Nightmares in an Education Mini‑Program and How to Avoid Them
Coder Trainee
Coder Trainee
Apr 12, 2026 · Backend Development

Integrating WeChat Pay for Education Mini‑Programs: Automated Deposit and Final‑Payment Settlement

This article walks through the complete WeChat Pay integration for an education‑focused mini‑program, covering the business flow, database schema, Java backend implementation for order creation, callback handling, automatic refunds, scheduled tasks, common pitfalls, and practical tips for reliable payment processing.

Database DesignJavaPayment Integration
0 likes · 21 min read
Integrating WeChat Pay for Education Mini‑Programs: Automated Deposit and Final‑Payment Settlement