postconstruct and predestroy in spring

Innocent Iguana answered on March 24, 2024 Popularity 8/10 Helpfulness 4/10

answer postconstruct and predestroy in spring

postconstruct and predestroy in spring

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// SomeDependency.java (An independent class)
@Component 
public class SomeDependency {
	public void getReady() {
		System.out.println("Some logic using SomeDependency");
	}
}

// SomeClass.java (A dependent class)
@Component
public class SomeClass {
	private SomeDependency someDependency;
	public SomeClass(SomeDependency someDependency) {
		super();
		this.someDependency = someDependency;
		System.out.println("All dependencies are ready!"); // This will be printed during bean initialization and dependency injection
	}
	
	@PostConstruct // This method will be automatically invoked immediately after all the dependency injection is completed
	public void initialize() {
		someDependency.getReady();
	}
	
	@PreDestroy // This method will be automatically invoked immediately before the bean is removed or goes out of scope
	public void cleanup() {
		System.out.println("Cleanup");
	}
}

// PrePostAnnotationsContextLauncherApplication.java (The application launcher)
@Configuration
@ComponentScan
public class PrePostAnnotationsContextLauncherApplication {
	public static void main(String[] args) {
		try (var context = new AnnotationConfigApplicationContext(PrePostAnnotationsContextLauncherApplication.class)) {
			Arrays.stream(context.getBeanDefinitionNames())
                  .forEach(System.out::println);
		} } }

Popularity 8/10 Helpfulness 4/10 Language java

Source: Grepper

Tags: java postconstruct predestroy spring

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Contributed on Mar 24 2024

Innocent Iguana

0 Answers Avg Quality 2/10

postconstruct and predestroy in spring

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