Spring application context bean are all created in the form of a singleton (Singleton) a. In other words, regardless of a given bean is injected into another bean how many times the injected are the same instance.
However, there are times when a class is in different situations require different attributes, in this case, the class is declared as a singleton bean is not a good idea, because the object is contaminated, reused later time there will be unexpected problems
Spring defines a variety of scopes can be created based on these bean scope, including:
- Singleton (Singleton): throughout the application, only create an instance of the bean.
- Prototype (Prototype): each injection or acquired by the Spring application context
that they will create a new bean instance. - Session (Session): In the Web application, create a real bean for each session
patients. - Request (Rquest): In Web applications, to create a solid for each request bean
embodiment.
Singleton is the default scope scope If other, to use @Scope annotation, it can
be used with or @Component @Bean.
