Crafting Spring Boot Starters

Every Spring Boot developer consumes starters. But do you know how to write one of your own?

As your team and your projects grow, so grows the need for shared code. The best way is to provide company-wide starters that all teams can use and depend upon. You can even put such a starter in the open for the whole world to benefit. But how exactly do you ensure that the library is a good Spring Boot citizen? You need to think about defaults, extension points, conditional wiring, testability, observability, documentation and so much more.

Crafting Spring Boot Starters walks you through all these things, showing how to implement them with real starters in the thirty chapters of the book.

Along the way you will learn how to:

• Design auto-configuration that activates only when it should, and stays out of the way when it shouldn't.
• Expose SPI interfaces, customizer chains, and configuration properties that hold up in real applications.
• Test starters in isolation, in slices, and against Testcontainers, including how to write a test starter of your own.
• Instrument library code with Micrometer Observation, custom actuator endpoints, and health indicators.
• Lay out a Maven build that scales from a single module to an autoconfigure + starter + BOM split.
• Publish releases through JReleaser.
• Write a README, samples folder, and reference site that turn a curious reader into an adopter.

The book is for Java developers who have shipped Spring Boot applications and now want to ship libraries. Every chapter is using patterns from real production starters, rebuilt from scratch so you can read, run, and adapt the code yourself.