[Solved] Consider this Spring Boot code snippet:@Component public class ServiceA { @Autowired private ServiceB serviceB;... }What problem will occur when the application starts? | Spring Boot

Spring Boot - Inversion of Control and Dependency Injection

Consider this Spring Boot code snippet:

@Component
public class ServiceA {
  @Autowired
  private ServiceB serviceB;
}

@Component
public class ServiceB {
  @Autowired
  private ServiceA serviceA;
}

What problem will occur when the application starts?

AServiceB will not be injected into ServiceA

BNo problem, both services work fine

CCircular dependency causing startup failure

DCompilation error due to missing constructors

Step-by-Step Solution

Solution:

Step 1: Identify circular dependency
ServiceA depends on ServiceB and ServiceB depends on ServiceA, creating a circular reference.
Step 2: Understand Spring's behavior on circular dependencies
Spring cannot resolve this circular injection automatically with field injection, causing startup failure.
Final Answer:
Circular dependency causing startup failure -> Option C
Quick Check:
Circular dependency = startup error [OK]

Quick Trick: Check if two beans inject each other directly [OK]

Common Mistakes:

Assuming circular dependencies always work
Thinking missing constructors cause compile errors here
Believing Spring resolves all circular injections automatically

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More Spring Boot Quizzes

Consider this Spring Boot code snippet:

Step 1: Identify circular dependency

Step 2: Understand Spring's behavior on circular dependencies

Final Answer:

Quick Check:

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