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What are Spring beans?

 The Spring Beans are Java Objects that form the backbone of a Spring application. They are instantiated,  assembled, and managed by the Spring IoC container. These beans are created with the configuration  metadata that is supplied to the container, for example, in the form of XML <bean/> definitions.

 Beans defined in spring framework are singleton beans. There is an attribute in bean tag named  "singleton" if specified true then bean becomes singleton and if set to false then the bean becomes a  prototype bean. By default it is set to true. So, all the beans in spring framework are by default singleton  beans.

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