A non-visual component involving a transaction-oriented, distributed enterprise application is called Enterprise beans. They are characteristically deployed in containers of EJB and run on servers of EJB.
The three enterprise bean types are:
Session Beans: These enterprise beans are non-persistent and can be stateless or stateful. If a conversational state is needed then, Stateful mode is preferred while Stateless paradigm is preferred for a single business process.
Entity Beans: Entity Beans were presented in the earlier versions of EJB consisting of persistent data in distributed objects. They had the ability to be saved in different persistent data stores.
Message Driven Beans: Asynchronous execution by means of messaging paradigm is supported. Follow the process of receiving and processing data. They are accessed only through messages and do not have a conversational state maintained.
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