Sun Java System Application Server Platform Edition 8.1 2005Q2 Update 2 Upgrade and Migration Guide

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## Business Components

Business components of the application are encapsulated by session beans.

The `BankTeller` bean is a stateful session bean that encapsulates all interaction between the customer and the system. `BankTeller` is notably in charge of the following activities:

- Authenticating a customer through the `authCheck()` method

- Giving the list of accounts for the customer through the `getAccountSummary()` method

- Transferring funds between accounts on behalf of the customer through the `transferFunds()` method

The `InterestCalculator` bean is a stateless session bean that encapsulates financial calculations. It is responsible for providing the compound interest projection calculations, through the `projectEarnings()` method.

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