Question: What Is Factory Bean In Spring?

What are the bean scopes in spring?

Spring – Bean ScopesSr.No.Scope & Description1singleton This scopes the bean definition to a single instance per Spring IoC container (default).2prototype This scopes a single bean definition to have any number of object instances.3 more rows.

How can we inject beans in spring?

The injection in Spring is either done via setter injection of via construction injection. These classes which are managed by Spring must conform to the JavaBean standard. In the context of Spring classes are also referred to as beans or as Spring beans.

What is the difference between bean factory and ApplicationContext?

It means Beanfactory Container loads beans lazily. While ApplicationContext Container creates objects of Singleton bean at the time of loading only. … Beanfactory Container support only two scopes (singleton & prototype) of the beans. But ApplicationContext Container supports all the beans scope.

How is bean scope defined in spring?

Spring Bean Scopessingleton – only one instance of the spring bean will be created for the spring container. … prototype – A new instance will be created every time the bean is requested from the spring container.request – This is same as prototype scope, however it’s meant to be used for web applications.More items…•

Can we Autowire POJO class?

The @Autowired annotation in spring automatically injects the dependent beans into the associated references of a POJO class. This annotation will inject the dependent beans by matching the data-type (i.e. Works internally as Autowiring byType).

What is @configuration in spring?

@Configuration annotation is used for Spring annotation based configuration. The @Configuration is a marker annotation which indicates that a class declares one or more @Bean methods and may be processed by the Spring container to generate bean definitions and service requests for those beans at runtime.

What is 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.

What is use of @autowired in spring?

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. …

How do I Autowire utility in spring?

You can only @Autowire a bean managed by Spring. So you have to declare your instance through some configuration : a bean in an xml file, or a @Bean method in a java configuration. @Component are just automatically discovered and registered in the spring context.

How do I initialize a spring bean?

The order of bean initialization is same as it’s defined in the spring bean configuration file. The context is returned only when all the spring beans are initialized properly with post-init method executions. Employee name is printed as “Pankaj” because it was initialized in the post-init method.

What is bean in spring with example?

A bean is an object that is instantiated, assembled, and otherwise managed by a Spring IoC container. These beans are created with the configuration metadata that you supply to the container. For example, in the form of XML definitions which you have already seen in the previous chapters.

Is Spring beans are thread safe?

Singleton spring beans has no relation with thread safety. spring container only manages life-cycle of objects and guaranteed that only one object in spring container. so If an Non thread safe object is injected then obviously it is not thread safe. To make it thread safe you have to handle it by coding.

Are all spring beans singletons?

Spring’s default scope is singleton. … Only one shared instance of a singleton bean is managed, and all requests for beans with an id or ids matching that bean definition result in that one specific bean instance being returned by the Spring container.

What is the difference between @bean and @autowired?

Annotating @Bean only registers the service as a bean(kind of an Object) in spring application context. … Annotating a variable with @Autowired injects a BookingService bean(i.e Object) from Spring Application Context.

What is factory method in spring?

Dependency Injection with Factory Method in Spring. Spring framework provides facility to inject bean using factory method. … factory-method: represents the factory method that will be invoked to inject the bean. factory-bean: represents the reference of the bean by which factory method will be invoked.

What is bean in 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.

What is bean and bean factory in Spring?

Answer: A BeanFactory is like a factory class that contains a collection of beans. The BeanFactory holds Bean Definitions of multiple beans within itself and then instantiates the bean whenever asked for by clients. The BeanFactory is the actual container which instantiates, configures, and manages a number of beans.

How do you make a spring bean static?

In Spring framework, if you want to create a bean by invoking a static factory-method, whose purpose is to encapsulate the object-creation process in a static method then you could use factory-method attribute.

Can we Autowire static variable in spring?

In short, no. You cannot autowire or manually wire static fields in Spring. You’ll have to write your own logic to do this. @Autowired can be used with setters so you could have a setter modifying an static field.

What does the Spring bean lifecycle look like?

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 are different types of spring bean Autowiring?

The XML configuration based autowiring functionality has five modes – no , byName , byType , constructor , and autodetect . The default mode is no .