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Because of scalability reasons, container keeps some objects as active while passivating some of them. The passivation process takes place if the bean is not in a transaction. To help the container's management of resources, EJB specifies two kinds of session beans: stateless and stateful.
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Stateless session beans contain no conversational state and any bean instance can be used for any client invocation since there is no state information between method calls.
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Stateful session bean contains conversational state across method invocations and transactions.
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A state of a conversational bean is defined by its field values and transitive closure of the objects from the session bean's fields by following the object references.
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