[Solved] Consider a system using Dependency Injection (DI) with a... If a required dependency is not registered in the container, what is the most likely runtime behavior when the client requests the service? | OOP & Design Patterns

OOP & Design Patterns - Interface Segregation & Dependency Inversion - Fat Interfaces & IoC

Consider a system using Dependency Injection (DI) with an IoC container. If a required dependency is not registered in the container, what is the most likely runtime behavior when the client requests the service?

AThe IoC container throws a runtime exception indicating a missing dependency.

BThe client silently receives a null reference for the dependency.

CThe IoC container automatically creates a default implementation of the dependency.

DThe client falls back to a cached instance of the dependency.

Step-by-Step Solution

Solution:

Step 1: Understand DI container behavior
Most IoC containers throw runtime exceptions when a required dependency is missing to alert the developer.
Step 2: Analyze options
The IoC container throws a runtime exception indicating a missing dependency correctly describes the typical exception thrown. The client silently receives a null reference for the dependency is incorrect; silent null injection leads to hidden bugs. The IoC container automatically creates a default implementation of the dependency is false; containers do not create default implementations automatically. The client falls back to a cached instance of the dependency is incorrect; fallback caching is not standard behavior.
Final Answer:
Option A -> Option A
Quick Check:
Missing dependency -> runtime exception from IoC container [OK]

Quick Trick: Missing DI registration causes runtime exception [OK]

Common Mistakes:

MISTAKES

Assuming null is injected silently
Believing IoC auto-creates defaults
Thinking fallback caching is automatic

Trap Explanation:

PITFALL

Candidates often think missing dependencies fail silently or are auto-created, missing the explicit error signaling.

Interviewer Note:

CONTEXT

Tests understanding of DI container error handling at runtime.

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Solution Trace

More OOP & Design Patterns Quizzes

If a required dependency is not registered in the container, what is the most likely runtime behavior when the client requests the service?

Step 1: Understand DI container behavior

Step 2: Analyze options

Final Answer:

Quick Check:

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