Beans in detail
A Spring application is composed of a set of beans that perform functionality specific to your application layers and are managed by the IoC container. You define your beans with configuration metadata in the form of XML, annotation, or JavaConfig.
Note
The default scope of a Spring bean is singleton. This means that a single instance is shared between clients anywhere in the application. Beware of keeping state (class level data) in singleton classes, as a value set by one client will be visible to all others. The best use case for such singleton classes are stateless services.
Beans are uniquely identified by an id attribute, any of the values supplied to the (comma, semicolon, or space separated) name attribute of the bean definition, ...
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