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Let s start with some background information. Application functionality requires that several things be done at the same time. For example, when an auction finishes, three different tasks have to be performed by the CaveatEmptor application:

1 2 3

received when referencing an optional task is now very explicit in version 1.5. It boils down to: don t file a bug report, it isn t a real defect. The message received when an unknown task is encountered lists many possible causes, but probably the most common causes after simple spelling errors are a missing optional.jar or missing libraries for the task. 10.1.2 Ant s major optional tasks Table 10.1 categorizes the majority of Ant s optional tasks.

Mark the winning (highest amount) bid. Charge the seller the cost of the auction. Notify the seller and successful bidder.

Table 10.1 Ant s optional tasks. Most of these tasks require installation of additional components. Task Category Source Code Management EJB Archiving / Distribution Utilities Testing Networking Miscellaneous Metrics / Coverage Analysis Description of tasks ClearCase, Continuus, Perforce, PVCS, StarTeam, Visual SourceSafe / SourceOffSite <ejbjar> and others. 14 covers the EJB tasks. CAB, RPM PropertyFile, Native2Ascii, ReplaceRegExp, Translate JUnit, JUnitReport Telnet, FTP MimeMail , Jlink, Script, Sound, XmlValidate JDepend, JProbe, Metamata

What happens if you can t bill the auction costs because of a failure in the external credit-card system The business requirements may state that either all listed actions must succeed or none must succeed. If so, you call these steps collectively a transaction or unit of work. If only one step fails, the whole unit of work must fail. This is known as atomicity, the notion that all operations are executed as an atomic unit. Furthermore, transactions allow multiple users to work concurrently with the same data without compromising the integrity and correctness of the data; a particular transaction should not be visible to other concurrently running transactions. Several strategies are important to fully understand this isolation behavior, and we ll explore them in this chapter. Transactions have other important attributes, such as consistency and durability. Consistency means that a transaction works on a consistent set of data: a set of data that is hidden from other concurrently running transactions and that is left in a clean and consistent state after the transactions completes. Your database integrity rules guarantee consistency. You also want correctness of a transaction. For

Many of these tasks require that dependencies be in the classpath of Ant s JVM, and this typically means that the dependencies should be in ANT_HOME/lib (JUnit and Log4j for example) or in the system classpath. Any dependencies required for the optional tasks are noted in the documentation. Beyond what is covered in this chapter, several of Ant s optional tasks are given special attention elsewhere in this book. JUnit integration is covered in chapter 4 ( Testing ). FTP and Telnet are covered in chapter 7 ( Deployment ). XmlValidate is covered more extensively in chapter 13. Emailing file attachments is covered in chapter 7. The Script task is covered in chapter 20. Javah is covered in chapter 18 ( C++ integration ). JSPC is covered in chapter 12. There are many additional optional tasks that we do not cover in detail in this book because they are only useful in specific environments and are not generally applicable to the majority of Java development situations; however, these tasks are covered in Ant s documentation. Many useful, and probably necessary, tasks are considered optional in the Ant documentation, even though you are unlikely to consider some of them optional! Tasks such as <junit> and <xmlvalidate> are indispensable for build best practices.