"For most Java developers, Spring DI is like having a personal assistant. You declare your beans with @Component, @Service, or @Repository. Then, with @Autowired, Spring takes care of the rest. For example: @Servicepublic class OrderService { @Autowired private PaymentService paymentService; public void placeOrder(Order order) { paymentService.processPayment(order.getAmount()); }} Simple, right? You didn't create PaymentService yourself. You didn't pass it in the constructor. Spring finds the right bean at runtime and injects it for you."
"From a Java developer's perspective, this is convenient. But notice a few things: Runtime resolution: Spring decides which PaymentService to use when your application starts, not when you write the code. Reflection magic: @Autowired uses reflection to inject dependencies. This is hidden but adds complexity under the hood. Hidden coupling: Your code is now implicitly tied to Spring. You cannot easily run OrderService outside a Spring context without some setup."
Spring dependency injection wires beans and resolves dependencies at runtime using reflection-based annotations like @Autowired. Applications gain convenience by avoiding explicit construction and constructor wiring, but rely on runtime resolution of implementations and implicit framework coupling. Reflection-based injection hides complexity and makes components harder to run outside a Spring context. An OrderService example shows a service with an injected PaymentService that is not constructed or passed in code. Scala favors explicit, compile-time-checked dependency models that avoid framework magic, reduce hidden costs, and increase clarity and portability of components.
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