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> ## Session Bean Examples

> Session beans provide a simple but powerful way to encapsulate business logic within an application. They can be accessed from remote Java clients, web service clients, and from components running in the same server.

> In Chapter 21, you built a stateless session bean named `ConverterBean`. This chapter examines the source code of three more session beans:

> - `CartBean`: a stateful session bean that is accessed by a remote client
> - `HelloServiceBean`: a stateless session bean that implements a web service
> - `TimerSessionBean`: a stateless session bean that sets a timer