Which of the following is the correct way to inject ApplicationEventPublisher in a Spring Boot component?

easy📝 Syntax Q12 of 15

Spring Boot - Advanced Patterns

Which of the following is the correct way to inject ApplicationEventPublisher in a Spring Boot component?

A@Autowired private ApplicationEventPublisher publisher;

Bprivate ApplicationEventPublisher publisher = new ApplicationEventPublisher();

C@Inject ApplicationEventPublisher publisher = null;

DApplicationEventPublisher publisher = ApplicationEventPublisher.getInstance();

Step-by-Step Solution

Solution:

Step 1: Recall Spring dependency injection syntax
Spring uses @Autowired to inject beans automatically into components.
Step 2: Check each option for correctness
@Autowired private ApplicationEventPublisher publisher; uses @Autowired correctly. private ApplicationEventPublisher publisher = new ApplicationEventPublisher(); tries to instantiate interface (not allowed). @Inject ApplicationEventPublisher publisher = null; mixes @Inject with assignment (not typical in Spring). ApplicationEventPublisher publisher = ApplicationEventPublisher.getInstance(); uses a non-existent getInstance method.
Final Answer:
@Autowired private ApplicationEventPublisher publisher; -> Option A
Quick Check:
@Autowired injects beans properly [OK]

Quick Trick: Use @Autowired for Spring bean injection [OK]

Common Mistakes:

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