Accelerating Java and Spring Boot Web App Development with AI Coding Agents — Repository Practices for the Claude Code and Codex Era

The biggest lever for running AI coding agents fast on Java and Spring Boot is not model selection but shaping the repository so the AI cannot misread it. Pin the boundaries with Spring Modulith and hexagonal architecture, enforce them mechanically with ArchUnit and Modulith verify in CI, reproduce databases locally with Testcontainers @ServiceConnection, and expose your running app to AI through the Spring AI 1.1 MCP Server Boot Starter. This post lays out the full setup for AI-native Java and Spring Boot development.

Famous OSS Web Applications Built with Java and Spring Boot — Notable Examples by Category

Spring Boot powers a remarkable range of open-source web applications, from teaching apps like Spring PetClinic to production platforms like ThingsBoard, Apache Fineract, and Apereo CAS. The right project to study depends on whether you want a reference, a production base, or an internal developer tool, so this post groups them by category.