What is bean life cycle in Java?
Bean life cycle is managed by the spring container. When we run the program then, first of all, the spring container gets started. After that, the container creates the instance of a bean as per the request, and then dependencies are injected. And finally, the bean is destroyed when the spring container is closed.
What is bean life cycle?
The life cycle of a Spring bean is easy to understand. When a bean is instantiated, it may be required to perform some initialization to get it into a usable state. Similarly, when the bean is no longer required and is removed from the container, some cleanup may be required.
What are the methods of bean life cycle?
Spring framework provides the following four ways for controlling life cycle events of a bean: InitializingBean and DisposableBean callback interfaces. *Aware interfaces for specific behavior. Custom init() and destroy() methods in bean configuration file.
Can you describe the lifecycle of a spring bean in an ApplicationContext?
Spring Bean will be defined using stereotype annotations or XML Bean configurations. As soon as bean created and It will be instantiated and loaded into ApplicationContext and JVM memory. Spring container will create a bean id , scope , default values based on the bean definition.
What is difference between @component and @bean?
@Component is a class level annotation whereas @Bean is a method level annotation and name of the method serves as the bean name. @Component need not to be used with the @Configuration annotation where as @Bean annotation has to be used within the class which is annotated with @Configuration.
What does Autowiring mean?
Autowiring happens by placing an instance of one bean into the desired field in an instance of another bean. Both classes should be beans, i.e. they should be defined to live in the application context. What is “living” in the application context? This means that the context instantiates the objects, not you.
What is bean in Java Spring?
In Spring, the objects that form the backbone of your application and that are managed by the Spring IoC container are called beans. A bean is an object that is instantiated, assembled, and otherwise managed by a Spring IoC container. Otherwise, a bean is simply one of many objects in your application.
How does Spring achieve DI or IoC?
The Spring container uses Dependency Injection (DI) to manage the components that build up an application and these objects are called Spring Beans. Spring implements DI by either an XML configuration file or annotations. IoC is also known as dependency injection (DI).
What is life cycle of Spring MVC?
SpringMVC lifecycle– the overall view The entire process is request-driven. There is a Front Controller pattern and the Front Controller in Spring MVC is DispatcherServlet. Upon every incoming request from the user, Spring manages the entire life cycle as described in here.
What is the life cycle of a thread?
A thread goes through various stages in its lifecycle. For example, a thread is born, started, runs, and then dies. The following diagram shows the complete life cycle of a thread. New − A new thread begins its life cycle in the new state.
What is @bean used for?
@Bean is used to mark a method as one that creates a bean and Spring will then add it to the context for us. The return type of the method defines the type of bean that is created, so both of the beans created in this example will be referred to by the type MyBean rather than their implementations.