"When I first tried Scala, one thing hit me immediately: there's no Spring container. No @ComponentScan, no runtime bean scanning, no reflection-based wiring. At first, it felt... empty. But then came the "aha" moment. I realized that Scala DI doesn't need a framework. Plain objects, functions, and composition replace Spring's configuration and runtime magic. And once you get it, you start asking: "Do I really need a container at all?""
"The key is type-driven wiring: Analogy: Spring DI is like a hotel concierge: it takes care of everything at runtime, but you don't see the process.Scala DI is like a coffee bar at home: you pick the beans, the cup, the grinder - and the compiler makes sure you haven't left anything behind. You control everything, and mistakes are caught before you even brew."
Scala performs dependency injection without a runtime container by using given definitions and using clauses to express available and required dependencies. The compiler performs wiring and ensures type compatibility at compile time, removing the need for reflection-based runtime scanning, annotations, or lifecycle proxies. Plain objects, functions, and composition replace container configuration and runtime magic. Explicit lifecycle management and manual composition keep control predictable. Type-driven wiring makes dependencies visible in types and constructor parameters, while given and summon provide available implementations. Composition becomes the primary configuration mechanism and leads to earlier error detection and simpler application structure compared with container-based DI.
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