How do you control the life cycle of a spring bean?

Spring framework provides following 4 ways for controlling life cycle events of a bean:

1. InitializingBean and DisposableBean callback interfaces.
2. *Aware interfaces for specific behavior.
3. Custom init() and destroy() methods in bean configuration file.
4. @PostConstruct and @PreDestroy annotations.

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Also to know is, how can call destroy method in spring bean?

You can configure it using init-method, and destroy-method in the xml based configuration file. These are part of spring bean life cycle. The initialization method will be called immediately after bean creation, and destroy method will be called before killing the bean instance.

One may also ask, what is the use of spring bean life cycle? A “Spring bean” is just a Spring-managed instantiation of a Java class. The Spring IoC container is responsible for instantiating, initializing, and wiring beans. The container also manages the life cycle of beans. Spring provides several ways through which you can tap into the bean lifecycle.

Furthermore, what is life cycle of bean in Spring container?

1.1 Spring Bean Lifecycle Spring bean is responsible for managing the lifecycle of beans created through the spring container. The bean lifecycle consists of post-initialization and pre-destruction callback methods.

How are beans initialized in spring?

Spring Bean Life Cycle Important Points:

1. From the console output it's clear that Spring Context is first using no-args constructor to initialize the bean object and then calling the post-init method.
2. The order of bean initialization is same as it's defined in the spring bean configuration file.

Related Question Answers

What activities go under callbacks in spring?

Spring has two callbacks- initialization and destruction.

• Initialization. This interface org.springframework.beans.factory.InitializingBean interface allows a bean to perform initialization work.
• Destruction. The org.

What is spring Autowiring?

Autowiring in Spring. Autowiring feature of spring framework enables you to inject the object dependency implicitly. It internally uses setter or constructor injection. Autowiring can't be used to inject primitive and string values. It works with reference only.

What is @bean annotation in spring?

Annotating a class with the @Configuration indicates that the class can be used by the Spring IoC container as a source of bean definitions. The @Bean annotation tells Spring that a method annotated with @Bean will return an object that should be registered as a bean in the Spring application context.

What is BeanPostProcessor in spring?

BeanPostProcessor is used to interact with newly created bean instances before and/or after their initialization method is invoked by the Spring container. You can use BeanPostProcessor to execute custom logic before and/or after bean's initialization method is invoked by the Spring container.

What is Spring IoC?

Spring IoC Container Spring IoC is the mechanism to achieve loose-coupling between Objects dependencies. To achieve loose coupling and dynamic binding of the objects at runtime, objects dependencies are injected by other assembler objects.

What is an initialization method and how is it declared on a spring bean?

The init-method attribute specifies a method that is to be called on the bean immediately upon instantiation. Similarly, destroymethod specifies a method that is called just before a bean is removed from the container.

What is Init method in spring?

In Spring, you can use init-method and destroy-method as attribute in bean configuration file for bean to perform certain actions upon initialization and destruction. Alternative to InitializingBean and DisposableBean interface.

How do you Autowire annotation in spring?

In most cases, you may need autowired property in a particular bean only. In Spring, you can use @Autowired annotation to auto wire bean on the setter method, constructor or a field. Moreover, it can autowired property in a particular bean. The @Autowired annotation is auto wire the bean by matching data type.

What is @autowired in spring?

Autowiring in Spring. Autowiring feature of spring framework enables you to inject the object dependency implicitly. It internally uses setter or constructor injection. Autowiring can't be used to inject primitive and string values. It works with reference only.

What is Servlet life cycle?

A servlet life cycle can be defined as the entire process from its creation till the destruction. The servlet is initialized by calling the init() method. The servlet calls service() method to process a client's request. The servlet is terminated by calling the destroy() method.

What is the life cycle of beans?

Life Cycle of a Green Bean Plant. A side view shows a green bean seed in the soil, followed by the germination stage, where the seed sends roots into the warm, moist soil. The plant reaches for the sun, sprouting two leaves at first, and then begins to mature into a plant capable of producing beans.

What are spring annotations?

Spring annotations

• Bean annotations. Given list of annotations are used to define beans in spring and to control their registration preferences in application context. Annotation. Description.
• Context configuration annotations. These annotations helps in binding the different beans together to form the runtime application context. Annotation.

How does Spring achieve DI or IoC?

(Note: DI is not the only way to achieve IoC. There are other ways as well.) By DI, the responsibility of creating objects is shifted from our application code to the Spring container; this phenomenon is called IoC. Dependency Injection can be done by setter injection or constructor injection.

How many types of spring containers are there?

Spring provides the following two distinct types of containers. Sr.No. This is the simplest container providing the basic support for DI and is defined by the org. springframework.

What is default type of Autowiring in spring?

default : The default autowiring is "no". Default autowiring will inherit parent bean autowiring if nested. In XML configuration file, we use autowire attribute as follows. <bean name="employee" autowire="byName"> The autowire attribute is using byname value.

Which are the IoC containers in spring?

An IoC container is a common characteristic of frameworks that implement IoC. In the Spring framework, the IoC container is represented by the interface ApplicationContext. The Spring container is responsible for instantiating, configuring and assembling objects known as beans, as well as managing their lifecycle.

What is the difference between BeanPostProcessor and init destroy method in spring?

Init and Destroy callback methods are part of Spring bean life cycle phases. The init method is going to be executed after bean instantiation. BeanPostProcessor interface is used for extending the functionality of framework if want to do any configuration Pre- and Post- bean initialization done by spring container.

What is spring life cycle?

A “Spring bean” is just a Spring managed instantiation of a Java class. The Spring IoC container is responsible for instantiating, initializing, and wiring beans. The container also manages the life cycle of beans. Spring provides several ways through which you can tap into the bean lifecycle.

How many ways can you make beans in spring?

There are three different ways in which you can define a Spring bean: annotating your class with the stereotype @Component annotation (or its derivatives) writing a bean factory method annotated with the @Bean annotation in a custom Java configuration class.

Spring bean as @Component

1. @Service.
2. @Repository.
3. @Controller.