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The Transfer method accepts two Account objects and a Decimal value that identifies an amount of money to transfer between accounts When calling the Trans fer method, some obvious assumptions are implied: the from argument refers to a valid Account, and the account has enough money in it to subtract the specified amount Also, it isn t clear from this prototype whether amount must be a positive value or if amount can be negative.

<!-First insert a blank element, then use ModifyFile to update the value attribute of the element just added --> <XmlFile.AddElement Path="%(_DestConfigFile.FullPath)" XPath="/configuration/appSettings" Name="add" KeyAttributeName="key" KeyAttributeValue="helpEmail" IgnoreNoMatchFailure="false" Force="true" /> <Xml.ModifyFile Path="%(_DestConfigFile.FullPath)" AttributeName="value" Force="true" NewValue="$(_HelpEmail)" XPath="$(_HelpEmailXPath)" /> </Target>

In addition, what happens if the from argument and the to argument refer to the same account Is it "legal" to transfer money to and from the same account Also, what if the amount argument is outside a specific range set by the class designer Is it "legal" to transfer an amount of 0 The answers to the questions posed in the preceding paragraph are baked into Transfer s implementation by the developer of the Account class Ideally, the developer designing this class will clearly document all these assumptions so that developers using the class can implement the calling code in the most efficient way possible and so that few surprises occur at run time Unfortunately, developers usually find that documentation lacks a description of all the implicit assumptions, causing developers to discover their violations at run time.

Unless you re in the enviable situation of conducting green-field development with EJB 3, there is a chance your EJB 3 application will need to peacefully coexist with your EJB 2 applications and components, and vice versa. More than that, you ll probably want them to work together, interoperating with each other. Now there are several possibilities for using EJB 2 and EJB 3 together. Maybe you have decided to migrate a selected group of application components to EJB 3, while leaving some components in earlier versions as a part of an incremental migration. Another common case is where a newly developed EJB 3 application wants to leverage an existing EJB 2 component. Yet another instance could be that the developers decide to migrate the persistence tier of ActionBazaar built using CMP 2 to use the EJB 3 JPA, leaving all the session beans and MDBs implemented in EJB 2. A less likely but possible case is that you decide to move the business logic tier of your applications to EJB 3, and leave the persistence tier built with CMP 2 untouched. EJB 3 supports all these scenarios and makes the EJB 3 JPA available for use with session beans and MDBs built using EJB 2. The first EJB 3 migration item to be aware of is that if you want to package both EJB 2 style beans and EJB 3 beans and JPA entities in the same EJB module, then you must set the version attribute of the ejb-jar module to 3.0 as follows:

Hopefully, all these violations will be detected and corrected during the application s test cycle so that no violations occur after the application is deployed and running in the hands of users How does a method notify its caller that one of its assumptions has been violated It throws an exception After all, an exception is simply a violation of a programming interface s assumptions The next point I want you to understand is that violating a programming interface s assumption isn t necessarily a bad thing In fact, it can be a good thing because exception handling allows you to catch the exception and gracefully continue execution When designing a type, first imagine how the type is going to be most commonly used; then design your interface to work well with this usage.

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