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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
May 16, 2026 · Cloud Native

Spring Cloud Gateway: Unified Entry Point for Microservice Calls

This tutorial walks through adding Spring Cloud Gateway as a single entry point for client calls to multiple microservices, covering why a gateway is needed, project structure, dependency and configuration setup, global logging and authentication filters, startup verification, and common pitfalls with solutions.

AuthenticationGlobal FilterLoad Balancer
0 likes · 13 min read
Spring Cloud Gateway: Unified Entry Point for Microservice Calls
Coder Trainee
Coder Trainee
May 15, 2026 · Cloud Native

Simplify Service Calls in Spring Cloud Microservices with OpenFeign (Revised Edition)

This article shows how to replace verbose WebClient/Nacos calls with declarative OpenFeign in a Spring Cloud microservice setup, reducing code by about 80%, improving readability, adding automatic load balancing, retries, logging, and circuit‑breaker support, and provides step‑by‑step configuration, code examples, and common pitfalls.

Feign clientOpenFeignSpring Cloud
0 likes · 12 min read
Simplify Service Calls in Spring Cloud Microservices with OpenFeign (Revised Edition)
Coder Trainee
Coder Trainee
May 13, 2026 · Cloud Native

Spring Cloud Microservices Revised Edition – Intro and New Tech Stack

After finishing the Spring Boot source‑code series, the author launches a refreshed Spring Cloud microservices tutorial built on Spring Boot 3.x, Jakarta EE, GraalVM native images, full production‑grade demos, Kubernetes deployment, observability and performance testing, outlining a 12‑episode roadmap.

GraalVMJava 17Kubernetes
0 likes · 7 min read
Spring Cloud Microservices Revised Edition – Intro and New Tech Stack
Coder Trainee
Coder Trainee
May 12, 2026 · Backend Development

Designing a Logistics Prepaid Deduction System: Architecture & Core Implementation

This article details a logistics‑focused prepaid deduction platform built with a Spring Boot backend and Vue 3 frontend, covering precise cent‑to‑yuan handling, role‑based view isolation, VO‑based pagination, automatic deduction workflow, and an Apple‑style responsive UI using Tailwind CSS.

Money PrecisionMySQLRole-Based Access
0 likes · 6 min read
Designing a Logistics Prepaid Deduction System: Architecture & Core Implementation
Coder Trainee
Coder Trainee
May 10, 2026 · Backend Development

Spring Boot Source Code Deep Dive (Part 7): Full Recap and Ultimate Interview Guide

The final installment of the Spring Boot source‑code series consolidates the previous six episodes—covering startup flow, auto‑configuration, IoC container, bean lifecycle, circular dependencies, and SPI—while providing a complete knowledge map, 20 interview‑question templates, practical study tips, and a roadmap for further learning and contribution.

Bean LifecycleDebuggingDependency Injection
0 likes · 14 min read
Spring Boot Source Code Deep Dive (Part 7): Full Recap and Ultimate Interview Guide
Coder Trainee
Coder Trainee
May 8, 2026 · Backend Development

How Spring Boot Instantiates Beans and Resolves Circular Dependencies

This article walks through Spring Boot's bean creation pipeline—from the initial getBean call through doGetBean, the three‑level singleton cache, and the detailed steps of createBean, populateBean, and initializeBean—explaining how circular dependencies are safely resolved and where AOP proxies are generated.

AOPBeanBean Lifecycle
0 likes · 14 min read
How Spring Boot Instantiates Beans and Resolves Circular Dependencies
Coder Trainee
Coder Trainee
May 7, 2026 · Backend Development

Deep Dive into Spring Boot IoC Container Initialization (Part 4)

This article breaks down Spring Boot's core refresh() method into twelve detailed steps, explaining how the IoC container prepares, configures, and starts up—including bean factory preparation, post‑processor registration, singleton instantiation, and final event publishing—providing interview‑ready insights and code illustrations.

BeanFactoryIoCRefresh
0 likes · 14 min read
Deep Dive into Spring Boot IoC Container Initialization (Part 4)
Coder Trainee
Coder Trainee
May 6, 2026 · Backend Development

Spring Boot Auto-Configuration: In‑Depth Source Code Walkthrough

This article explores the complete execution flow of Spring Boot’s auto‑configuration, detailing the role of @EnableAutoConfiguration, the AutoConfigurationImportSelector hierarchy, how candidate configurations are loaded from spring.factories, filtered by conditions, and how to create custom starters, with interview‑style Q&A.

Backend developmentConditional AnnotationsCustom Starter
0 likes · 12 min read
Spring Boot Auto-Configuration: In‑Depth Source Code Walkthrough
Coder Trainee
Coder Trainee
May 5, 2026 · Backend Development

What Does @SpringBootApplication Actually Do? A Deep Dive into Spring Boot’s Core Annotation

This article dissects the @SpringBootApplication annotation, explaining how it combines @SpringBootConfiguration, @EnableAutoConfiguration, and @ComponentScan, and walks through the auto‑configuration mechanism, conditional annotations, and common interview questions with concrete code examples.

@SpringBootApplicationBackend developmentComponentScan
0 likes · 10 min read
What Does @SpringBootApplication Actually Do? A Deep Dive into Spring Boot’s Core Annotation