Why it matters

DI shapes maintainable Java code. Understanding integration matters.

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The architecture

Spring Boot app: @Configuration provides beans.

Tools + agents: constructor or field injection.

DI integrationSpring configdefine beansConstructor injectinto tools + agentsTest with mocksswap beansConstructor injection preferred over field for testability and clarity
DI pattern.
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How it works end to end

Constructor injection: preferred. Explicit dependencies.

Testing: inject mocks for unit tests.

Scopes: request-scoped for per-request state; singleton for shared.

Framework choice: Spring most common; Guice alternative.