What is Bean aware?
BeanNameAware makes the object aware of its bean name. It is best used in pre annotation config spring (2. x). You could reference the bean from a locator by its name then. BeanFactoryAware gives the bean access to the beanfactory that created it.
What is spring bean life cycle?
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 the role of ApplicationContextAware in spring to perform dependency injection to make bean aware on the container?
The ApplicationContextAware Interface Spring provides an ApplicationContextAware interface that allows beans access to the ApplicationContext . This interface provides a single setApplicationContext method.
What are different types of Autowiring in spring?
The autowiring functionality has four modes. These are ‘ no ‘, ‘ byName ‘, ‘ byType ‘ and ‘ constructor ‘.
What is EnvironmentAware?
public interface EnvironmentAware extends Aware. Interface to be implemented by any bean that wishes to be notified of the Environment that it runs in.
What is Beanfactorypostprocessor?
A bean post-processor is a java class which implements the org.springframework.beans.factory.config.BeanPostProcessor interface, which consists of two callback methods. (postProcessAfterInitialization(Object bean, String beanName) & postProcessBeforeInitialization(Object bean, String beanName)).
What is the purpose of @autowired in Spring?
The @Autowired annotation provides more fine-grained control over where and how autowiring should be accomplished. The @Autowired annotation can be used to autowire bean on the setter method just like @Required annotation, constructor, a property or methods with arbitrary names and/or multiple arguments.
What is BeanFactory and ApplicationContext in Spring?
While the BeanFactory provides basic functionality for managing and manipulating beans, often in a programmatic way, the ApplicationContext provides extra functionality like MessageSource, Access to resources, Event propagation to beans, Loading of multiple (hierarchical) contexts etc.
What is @PropertySource in spring boot?
Spring @PropertySource annotation is used to provide properties file to Spring Environment. This annotation is used with @Configuration classes. Spring PropertySource annotation is repeatable, means you can have multiple PropertySource on a Configuration class.
What is difference between BeanPostProcessor and BeanFactoryPostProcessor?
BeanFactoryPostProcessor implementations are “called” during startup of the Spring context after all bean definitions will have been loaded while BeanPostProcessor are “called” when the Spring IoC container instantiates a bean (i.e. during the startup for all the singleton and on demand for the proptotypes one)
What is BeanPostProcessor?
A bean post processor allows for custom modification of new bean instances created by spring bean factory. If you want to implement some custom logic after the Spring container finishes instantiating, configuring, and initializing a bean, we can plug in one or more BeanPostProcessor implementations.
Can we Autowire entity class?
You can only autowire only those beans whose life-cycle are managed by Spring IoC container. These beans are defined in xml form with tag, or with some special annotations like @Bean , @Component , @Service , @Repository etc.