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Developer shares key lessons from building a Spring Boot 4.1.0 SaaS boilerplate

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A developer created SpringLaunch API, a production-ready boilerplate for Spring Boot 4.1.0, to eliminate the repetitive 2–3 week setup required at the start of every new project. The boilerplate covers JWT authentication, email verification, Google OAuth2, Docker, and CI/CD pipelines out of the box. Building it surfaced several important changes in Spring Boot 4.1.0, including shifted import paths, the replacement of @MockBean with @MockitoBean, and auto-configuration of DaoAuthenticationProvider. The developer also documented common pitfalls such as the @Async self-invocation trap, where calling an async method within the same class bypasses Spring's proxy and runs synchronously. Additional findings included the soft-deprecation of Argon2PasswordEncoder in favour of Password4j integration and the incompatibility of JPA entities with Java records due to mutability requirements.

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