Use Spring Initializr

@Service @RequiredArgsConstructor public class BookService private final BookRepository bookRepo; public Book saveBook(Book book) return bookRepo.save(book);

One of the defining features of Spring Boot is the use of . Traditionally, you would build a WAR file, hand it to an operations team, and wait for them to deploy it to a running WebSphere or Tomcat instance.

No discussion of "Spring Boot In Action" is complete without addressing the elephant in the room: .

Whether you are a solo developer building a side project, or an architect designing a system that handles 10,000 requests per second, Spring Boot scales with you. It respects your time by handling the boilerplate, and it respects your users by providing production-ready resilience.