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The easiest way to generate a WSDL document is to use a tool such as Visual Studio .NET. There is very much a chicken-and-the-egg relationship between a WSDL document and the Web service implementation that it describes. That is, you can write the code first and generate the WSDL document later. Or you can manually write the WSDL document first, and then use it to autogenerate the code definition. Because it is very difficult to generate a WSDL document by hand, you are better off writing the code implementation first and then using Visual Studio .NET to generate the WSDL document for you. Web services must be message-oriented if they are to be of any use in an SOA. s 3 and 4 provide a detailed discussion of how to build message-oriented Web services. It is essential that you follow good design patterns and practices when building Web services for an SOA. Assuming that you have built a message-oriented Web service according to the best patterns and practices (as discussed in the following chapters), you can generate a WSDL document by browsing the .asmx file of your Web service and clicking the Service Description link in the default client page. This link simply appends WSDL to the URL of the .asmx file. Figure 2-2 shows the default client page for the StockTraderService Web service and the corresponding Service Description link.

void afterBegin() Called right after the container creates a new transaction and before the business method is invoked. void beforeCompletion() Invoked after a business method returns but

void afterCompletion(boolean committed) Called after the transaction finishes. The boolean committed flag indicates whether a method was committed or rolled back.

Summary

Implementing this interface in a stateful session bean can be considered close to having a poor man s persistence mechanism, because data can be loaded into the bean when the transaction starts and unloaded right before the transaction finishes, while the afterCompletion callback can be used to reset default values. However, you can make a valid argument that since session beans are supposed to model processes, if it makes sense to cache some data and synchronize with the database as a natural part of a process, then this practice is just fine, if not fairly elegant. Note this facility doesn t make much sense in a stateless session bean or MDB where data should not be cached anyway; therefore, the interface is not supported for those bean types.

exception. Applying the @ApplicationException annotation to it causes it to be treated as an application exception instead. More than the @ApplicationException annotation itself, the rollback element changes default behavior in profound ways. By default, application exceptions do not cause an automatic CMT rollback since the rollback element is defaulted to false. However, setting the element to true tells the container that it should roll back the transaction before the exception is passed on to the client. In listing 6.2, this means that whenever a CreditValidationException, CreditProcessingException, or DatabaseException is thrown, the transaction will be rolled back and the client will receive an exception indicating the cause for failure, accomplishing exactly the same thing as the more verbose code in listing 6.1 aims to do. If the container detects a system exception, such as an

Figure 2-2. The default client page for the StockTraderService Web service The Service Description link will display the WSDL document in a tree view like format, wherein you can collapse and expand individual elements. This format is very useful for working your way through the document and learning how it is structured. Alternatively, you can copy the WSDL document from the browser window and then view it in an XML document editing application.

The Java Persistence Query Language JPA provides a specialized SQL -like query language called the Java Persistence Query Language (JPQL) to search for entities saved into the database. With a robust and flexible API such as JPQL, you won t lose anything by choosing automated persistence instead of handwritten JDBC. In addition, JPA supports native, database-specific SQL, in the rare cases where it is worth using. At this point, you should have a decent high-level view of the various parts of EJB. You also know that you need an EJB container to execute session beans and MDBs as well as a persistence provider to run your entities, so that these components can access the services EJB 3 provides. The container, the persistence provider, and the services are the central concepts in EJB 3, and we ll address them next.