Spring / Spring Beans
Spring bean: difference between stateless and stateful beans.
stateless beans: beans that are singleton and are initialized only once. The only state they have is a shared state. These beans are created while the ApplicationContext is being initialized. The SAME bean instance will be returned/injected during the lifetime of this ApplicationContext. .
stateful beans: beans that can carry state (instance variables). These are created every time an object is required.
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