Use of @PostConstruct in Spring Boot
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In Spring Boot, @PostConstruct is used to annotate a method that should be executed after dependency injection is complete and before the bean is put into service.
Example:
Suppose we have a class UserService that requires some initialization logic after its dependencies are injected. We can use @PostConstruct to annotate a method for this purpose.
import org.springframework.stereotype.Service;
@Service
public class UserService {
@PostConstruct
public void init() {
// Initialization logic, e.g., loading configuration, setting up resources, etc.
System.out.println(“UserService initialized!”);
}
// Other methods of UserService
}
In this example:
The UserService class is annotated with @Service to indicate it as a Spring-managed bean.
The init method is annotated with @PostConstruct, ensuring it runs automatically after all dependencies of UserService are injected by Spring.
Any initialization logic needed for UserService can be placed within the init method.
Conclusion:
@PostConstruct in Spring Boot provides a convenient way to perform initialization tasks for a bean after its dependencies are injected. It ensures that the initialization logic is executed exactly once before the bean is used, contributing to the robustness and reliability of the application.
