[Solved] How do you correctly perform constructor-based dependency injection in a Spring Boot component? — Ans: Declare a constructor with the dependency as a parameter and annotate the class... | Spring Boot

Spring Boot - Inversion of Control and Dependency Injection

How do you correctly perform constructor-based dependency injection in a Spring Boot component?

ACreate a setter method annotated with @Bean

BUse @Autowired on a private field without a constructor

CDeclare a constructor with the dependency as a parameter and annotate the class with @Component

DDeclare dependencies as static variables

Step-by-Step Solution

Solution:

Step 1: Understand constructor injection
Constructor injection requires a constructor with dependencies as parameters.
Step 2: Recognize correct usage
Annotate the class with @Component so Spring manages it.
Step 3: Exclude incorrect options
@Autowired on fields is field injection, @Bean is for factory methods, static variables are not injected.
Final Answer:
Declare a constructor with the dependency as a parameter and annotate the class with @Component -> Option C
Quick Check:
Constructor injection uses constructor parameters [OK]

Quick Trick: Constructor injection uses constructor parameters [OK]

Common Mistakes:

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