Spring Bean Life Cycle | PostConstruct and PreDestroy Spring Bean Life Cycle Interview Questions
Understanding the Spring Bean Life Cycle | What is the life cycle of a bean in Spring?
Spring Bean Life Cycle | PostConstruct and PreDestroy Spring | Spring Bean Life Cycle Interview Questions
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📚 Topics Covered:
Spring Bean Life Cycle using @PostConstruct @PreDestroy [init - method] [destroy - method]
add jakarta.annotation-api dependency [@PostConstruct @PreDestroy]
add context:annotation-config tags to activate annotation
dbConnectionOpen method is annotated with @PostConstruct
once spring create the employee object , pls call dbConnectionOpen() method
Introducing init() method // used to setup the resources like db/socket/file/newconnecton etc
step 1: Object created inside container
step 2: dependency injected (values injected)
step 3: init method called (@PostConstruct)
step 4: bean/obj is ready for use
step 5:
now lets clean up the unused references
Introducing @PreDestroy annotation
destroy method is called before the bean is removed from container
for standalone application like this, we need to create and destroy/close container object manually
for web application like (spring boot), create and destroy/close container object done automatically
step 5: container shutdown or .closed()
step 6: before you destroy, your custom destroy method is called(@PreDestroy)
step 7:
Another way to activate lifecyle annotation
lets remove context:annotation-config tag and use CommonAnnotationBeanPostProcessor
CommonAnnotationBeanPostProcessor (import org.springframework.context.annotation.CommonAnnotationBeanPostProcessor;)
Configure bean lifecycle with xml file
comment @PostConstruct and @PreDestroy annotation
introducing init-method="init" destroy-method="destroy"
those method is used to specify lifecycle methods in xml
another way to close the container .registerShutdownHook();
line number does not matter for .registerShutdownHook()
will execute once main() methods ends
default-init-method="" default-destroy-method="" if you have multiple classes with init and destroy method
coming up spring bean scope
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