Spring Boot / Basic: composition and HTTP contracts

Spring Boot β€” Basic: composition and HTTP contracts

Understand managed beans, typed settings, controller boundaries, validation, and explicit application policy.

6 lessons Β· No account required

What you will learn

  • Explain the pinned runtime and dependency graph.
  • Adapt requests without confusing transport, domain, and persistence guarantees.

  1. Boot runtime and a managed build

    Explain what Spring Boot contributes to a Java application and establish a reproducible version, dependency, and startup contract before adding business features.

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  2. Dependency injection and bean lifecycle

    Make collaborators and ownership visible through constructors, then distinguish ordinary Java composition from container discovery, scope, and proxy behavior.

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  3. External configuration and profiles

    Bind a small typed configuration contract, explain source precedence and profile activation, and keep secrets and deployment policy outside accidental defaults.

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  4. HTTP controllers and response contracts

    Adapt HTTP input into application calls and map explicit result states into stable methods, status codes, headers, and serialized DTOs.

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  5. Validation and safe problem details

    Separate conversion, Bean Validation, domain invariants, and persistence constraints, then expose stable errors without leaking rejected values or internal causes.

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  6. Application services and domain boundaries

    Keep a use case explicit across transport, domain decisions, state changes, and response mapping instead of treating a service annotation as an atomic business operation.

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