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The envelope is the root element of the message XML. It contains the message body and message header elements. The body element is required for all SOAP messages. It contains qualified XML for the request and response messages. The header contains optional extended information for the SOAP message. The WS- specification settings are stored in the header. The SOAP fault information, if present, is retrieved from the envelope and returned by the Fault property as an Exception class. The Context property enables you to modify the SOAP message contents within a custom WSE filter or to process the SOAP message contents within a SoapReceiver processing class.

The first parameter of the find method specifies the Java type of the entity to be retrieved. The second parameter specifies the identity value for the entity instance to retrieve. Recall from chapter 7 that an entity identity can either be a simple Java type identified by the @Id annotation or a composite primary key class specified through the @EmbeddedId or @IdClass annotation. In the example in listing 9.1, the find method is passed a simple java.lang.Long value matching the Seller entity s @Id annotated identity, sellerId. Although this is not the case in listing 9.1, the find method is fully capable of supporting composite primary keys. To see how this code might look, assume for

the sake of illustration that the identity of the Seller entity consists of the seller s first and last name instead of a simple numeric identifier. This identity is encapsulated in a composite primary key class annotated with the @IdClass annotation. Listing 9.7 shows how this identity class can be populated and passed to the find method.

Figure 5-9. The PageDumped event in the Properties window Double-clicking the PageDumped event adds a new event handler function to the hosting component. This event handler has the signature specified by the event handler delegate type. private: void fileDumper1_PageDumped( System::Object^ sender, SampleLib::PageDumpedEventArgs^ { }

SellerPK sellerKey = new SellerPK(); sellerKey.setFirstName(firstName); sellerKey.setLastName(lastName); Seller seller = entityManager.find(Seller.class, sellerKey);

The find method does what it does by inspecting the details of the entity class passed in as the first parameter and generating a SELECT statement to retrieve the entity data. This generated SELECT statement is populated with the primary key values specified in the second parameter of the find method. For example, the find method in listing 9.1 could generate a SELECT statement that looks something like this:

This chapter concluded with a brief look at how to generate and work with WSDL documents. In the following two chapters, we will give you a detailed look at how to build message-oriented Web services and how to work with WSDL documents and XSD schema definition files.

Note that if an entity instance matching the specified key does not exist in the database, the find method will not throw any exceptions. Instead, the EntityManager will return null or an empty entity and your application must handle this situation. It is not strictly necessary to call the find method in a transactional context. However, the retrieved entity is detached unless a transaction context is available, so it is generally advisable to call the find method inside a transaction. One of the most important features of the find method is that it utilizes EntityManager caching. If your persistence provider supports caching and the entity already exists in the cache, then the EntityManager returns a cached instance of the entity instead of retrieving it from the database. Most persistence providers like Hibernate and Oracle TopLink support caching, so you can more or less count on this extremely valuable optimization. There is one more important JPA feature geared toward application optimization lazy and eager loading. The generated SELECT statement in our example attempts to retrieve all of the entity field data when the find method is invoked. In general, this is exactly what will happen for entity retrieval since it is the default behavior for JPA. However, in some cases, this is not desirable behavior.

In addition to that, the wizard adds code to InitializeComponent so that the event handler function is registered with the event: void InitializeComponent(void) { this->fileDumper1 = (gcnew SampleLib::FileDumper()); // // fileDumper1 // this->fileDumper1->FileName = "C:\\data\test.txt"; this->fileDumper1->PageDumped += gcnew SampleLib::PageDumpedEventHandler(this, &SampleComponent::fileDumper1_PageDumped); } If you use the FileDumper class without the component designer, you have to write the event handler function as well as the registration code manually.