Building 12-Factor Spring Boot Applications: Simplicity, Scalability, and Best Practices @ Spring IO

Spring I/O 2025 - 21-23 May, Barcelona Speaker: Andrew Fawcett Slides: https://heroku-examples.github.io/jav... Repo: https://github.com/heroku-examples/ja... The Twelve-Factor App methodology provides a blueprint for building scalable, maintainable, and cloud-native applications, and Spring Boot naturally aligns with these principles by externalizing configuration, ensuring Dev/Prod parity, and seamlessly integrating with backing services. By adopting these best practices, developers can build applications that are portable, resilient, and easy to scale across environments. This session explores how Spring Boot enables Twelve-Factor best practices, from managing secrets and stateful service connections to deploying and scaling microservices efficiently. We’ll dive into strategies for simplifying configuration management, handling application state, and ensuring smooth deployment across different environments. Whether you’re launching a new service or modernizing an existing system, this session will provide practical strategies for building, deploying, and managing Spring Boot applications that fully embrace Twelve-Factor principles.