May 4, 2026 · Backend Development

Spring Boot Startup Process: A Zero‑to‑One Source Code Walkthrough

This article dissects the Spring Boot startup sequence step by step, showing how a minimal @SpringBootApplication triggers listeners, type deduction, auto‑configuration loading, environment preparation, IOC container creation, bean refresh, and embedded Tomcat launch, with interview‑ready explanations.

Auto-configurationJavaStartup Process

0 likes · 9 min read

Spring Boot Startup Process: A Zero‑to‑One Source Code Walkthrough

Java High-Performance Architecture

Oct 14, 2023 · Backend Development

Spring Boot Startup Explained: From Main Method to Tomcat Launch

This article walks through the complete Spring Boot startup sequence, starting with the SpringApplication.run entry point, detailing the preparation, application context creation, and refresh phases, and shows how the embedded Tomcat server is instantiated and started, illustrated with code snippets and diagrams.

Backend DevelopmentEmbedded TomcatJava

0 likes · 11 min read

Spring Boot Startup Explained: From Main Method to Tomcat Launch