Spring Framework FAQ: Top Questions

@PostConstruct and @PreDestroy are lifecycle annotations used for initialization and cleanup logic in Spring-managed beans.

🗺️ Step-by-Step:

1. @PostConstruct marks a method to be executed after dependency injection.
2. @PreDestroy marks a method to be executed before bean destruction.

📥 Example:

@Component
public class ResourceBean {

  @PostConstruct
  public void init() {
    System.out.println("Initializing resources...");
  }

  @PreDestroy
  public void destroy() {
    System.out.println("Cleaning up before shutdown...");
  }
}

🏆 Expected Output:

Prints initialization and cleanup messages at appropriate lifecycle phases.

🛠️ Use Cases:

• Opening/closing connections or files.
• Custom bean initialization tasks.