1 articles about Debugging. Explore Spring Boot implementation, design, and operations across related topics.
For anyone panicking at 'APPLICATION FAILED TO START'. Targeting Spring Boot 3.x, this guide walks through 7 typical patterns, including port conflicts, duplicate Beans, circular references, missing DataSource configuration, and profile mistakes, using a symptom-first reverse lookup. It also covers how to read FailureAnalyzer messages and how to use the --debug flag, with real examples.
2026-05-29
