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The representation of core business service objects called Session beans combines business logic in an enterprise application. In a standalone EJB container the Java component is executed or JEE application server container. Session beans business logic from a client interface are usually used to model tasks that get user information. For maintaining the state of conversation with respect to client application the enterprise logic in a session bean processes it. The needed services of the background sessions are provided by the EJB container. A session bean requires Java annotation designation via XML metadata on the basis of the type of service. Sessions beans are used with some key information in an enterprise application.
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A user interface is offered by a rich client front-end application in a common three-tier architecture for entering data by the end user, like information for creating new account, product purchase, credit card statement etc. and then a trigger is generated by offering the information. In the EJB container a connection is established to the existing session bean. Remote Method Invocation (RMI) is the technique used for helping to make the communication. The method is invocated with the help of RMI where appropriate business handling logic is associated with the client request. The data validation is done after the processing of the request by session bean with the back-end database server linked with the enterprise application. The client receives the appropriate response finally by the session bean in the form of acknowledgement message or data collection object.
JavaFx, Swing, or a simple POJO is used for developing the client application or with a console interaction and simple POJO. It is said that they are run a desktop and offer only a user interface. A rich interface is offered by the rich client that offers the end user a different experience. The event triggered by processing responsibility with the triggered event by the client interface is controlled by the session beans.
Types of Session Beans
Session beans are categorized into three parts: stateful, stateless, and singleton
Stateful: Between the server and the client application a conversational state information is maintained in this type of session. This type of bean is got as an instance from the EJB client and this is what it means. On the instance variables the EJB container will remain their values in method calls that are successive. By persisting information during passive state the EJB container offers the service. When it becomes active, the state information is retrieved. Because of this persistence act there are complex life cycle events in comparison to stateless session beans.
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Stateless: You will find simpler session beans because they do not need saving any state of conversation on behalf of the client.
Singleton: Only once per application this type of bean is created. Thus the state information is maintained between the invocations of client throughout the duration of the living application. It is created only once per application.
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