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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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Recent Articles

Latest from Coder Trainee

98 recent articles
Coder Trainee
Coder Trainee
Apr 27, 2026 · Cloud Native

Spring Cloud Microservices Practice #6: Sentinel for Service Fault Tolerance and Rate Limiting

This article explains why service fault tolerance is essential in micro‑service architectures, compares Sentinel with Hystrix and Resilience4j, and provides step‑by‑step guidance on integrating Sentinel for circuit breaking, QPS and concurrency limiting, hot‑parameter control, system protection, and dynamic rule management with Nacos.

Circuit BreakingFault ToleranceNacos
0 likes · 14 min read
Spring Cloud Microservices Practice #6: Sentinel for Service Fault Tolerance and Rate Limiting
Coder Trainee
Coder Trainee
Apr 26, 2026 · Cloud Native

How to Use Nacos Config Center in Spring Cloud Microservices

This article explains why scattered application.yml files cause configuration pain in microservices, introduces Nacos Config Center as a solution for unified, real‑time, environment‑isolated configuration management, and walks through quick setup, API usage, code integration, dynamic refresh, best practices, and common pitfalls.

BootstrapDynamic RefreshNacos
0 likes · 12 min read
How to Use Nacos Config Center in Spring Cloud Microservices
Coder Trainee
Coder Trainee
Apr 25, 2026 · Cloud Native

How to Expose Spring Cloud Microservices to Frontends with Spring Cloud Gateway

This article explains why a gateway is needed in a Spring Cloud microservice architecture, compares Spring Cloud Gateway with Zuul, introduces its core concepts of routes, predicates, and filters, and provides step‑by‑step code examples for dependency setup, configuration, custom authentication and logging filters, rate limiting, circuit breaking, troubleshooting tips, and a complete gateway configuration for a blog system.

API GatewayCircuit BreakerGateway
0 likes · 14 min read
How to Expose Spring Cloud Microservices to Frontends with Spring Cloud Gateway
Coder Trainee
Coder Trainee
Apr 24, 2026 · Backend Development

Mastering OpenFeign: Elegant Service Calls and Load Balancing in Spring Cloud

This article compares RestTemplate and OpenFeign for inter‑service calls, demonstrates how to set up OpenFeign with Spring Cloud, covers advanced configurations such as timeouts, retries, interceptors, logging, fallbacks, and circuit breaking, explains load‑balancing strategies, shares a complete microservice implementation, and resolves common pitfalls.

OpenFeignSpring CloudTimeout
0 likes · 13 min read
Mastering OpenFeign: Elegant Service Calls and Load Balancing in Spring Cloud
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.

Health CheckNacosService Discovery
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.

Comment SystemElasticsearchFull‑Text Search
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.

JWTVue3authentication
0 likes · 19 min read
Building a Tech Blog from Scratch (Part 2): Implementing Login Authentication with Spring Security and JWT