Spring Boot in Motion

Spring Boot is often taught as a collection of annotations. This course teaches it as a story: one request arrives at a socket and leaves as a response. Every layer — dispatcher, controller, service, repository, transaction, filter — has a specific job in that story. Once you see the story, the annotations become labels on a known map, and architectural decisions become easy.

How we teach Spring Boot

• Follow one request through the pipeline, step by step, in a story lab.
• Keep controllers thin, services transactional, repositories boring.
• Favor constructor injection and immutable configuration — the whole course is opinionated this way.
• Teach testing slices by pairing each with the real problem it exists to solve.

What you will actually be able to do

• Design REST endpoints whose method, URL, and status code communicate intent clearly.
• Validate request bodies at the edge and translate failures into uniform error responses.
• Organize beans by role — controllers, services, repositories, configuration.
• Write fast slice tests (@WebMvcTest, @DataJpaTest) and a few end-to-end tests.
• Secure an API with Spring Security 6 and understand the filter chain, not just copy it.

Prerequisites

Working Java knowledge (generics, collections, exceptions, lambdas). Basic familiarity with HTTP and JSON is helpful but not required.