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The Java API for XML Binding (JAXB) is an effort to define a two-way mapping between Java data objects and XML structures. The goal is to make the persistence of Java objects as XML easy for Java developers. Without JAXB, the process of storing and retrieving (serializing and deserializing, respectively) Java objects with XML requires the creation and maintenance of cumbersome code to read, parse, and output XML documents. JAXB enables you to work with XML documents as if they were Java objects.
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Serialization is the process of writing out the state of a running software object to an output stream. These streams typically represent files or TCP data sockets.
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The JAXB development process requires the creation of a DTD and a binding schema an XML document that defines the mapping between a Java object and its XML schema. You feed the DTD and binding schema into a schema compiler to generate Java source code. The resulting classes, once compiled, handle the details of the XML-Java conversion process. This means that you do not need to explicitly perform SAX or DOM parsing in your application code. Figure 2.10 depicts the JAXB process flow. Early releases of JAXB show improved performance over SAX and DOM parsers because its classes are lightweight and precompiled. This is a positive sign for the future of JAXB, given the common concerns about performance when using XML.
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Java Objects
Java Class Files
XML Documents
JAXB architecture
One tradeoff to consider before using JAXB is a loss of system flexibility, since any change in your XML or object structures requires recompilation of the JAXB classes. This can be inconvenient or impractical for rapidly evolving systems that use JAXB extensively. Each change to the JAXB infrastructure requires regenerating the JAXB bindings and retesting the affected portions of the system. JAXB manifests other issues in its current implementation that you should explore before using it in your applications. For example, the process by which XML data structures are created from relational tables is overly simplistic and resource intensive. Issues such as these are expected to subside as the specification matures over time. We provide an example of using JAXB in the remainder of this section. More information about the capabilities and limitations of this API are available at http:/ /java.sun.com/xml/jaxb/.
Binding Java objects to XML To see JAXB in action, we turn once again to our product catalog example from listing 2.1. We previously developed the DTD corresponding to this document, which is shown in listing 2.2. Creating the binding schema is a bit more complicated. We start by creating a new binding schema file called product-catalog.xjs. Binding schemas in the early access version of JAXB always have the following root element:
The Java APIs for XML
<xml-java-binding-schema version="1.0-ea">
This element identifies the document as a binding schema. We now define our basic, innermost elements in the product-catalog document:
<element name="description" type="class"> <attribute name="locale"/> <content property="description"/> </element>
<element name="price" type="class"> <attribute name="locale"/> <attribute name="unit"/> <content property="price"/> </element>
The type attribute of the element node denotes that the elements of type description and price in the product-catalog document are to be treated as individual Java objects. This is necessary because both description and price have their own attributes as well as content. The content element in each of the above definitions tells the JAXB compiler to create a property for the enclosing class with the specified name. The content of the generated Description class will be accessed via the getDescription and setDescription methods. Likewise, the Price class content will be accessed via methods called getPrice and setPrice. Having described these basic elements, we can now refer to them in the definition of the product element.
<element name="product" type="class"> <content> <element-ref name="description"/> <element-ref name="price"/> </content> </element>
The product element maps to a Java class named Product and will contain two Lists as instance variables. One of these will be a List of Description instances. The other will be a List of Price instances. Notice the use of element-ref instead of element in the definition of the description and price nodes. This construct can be used to create complex object structures and to avoid duplication of information in the binding document. The final element to bind is the root element, product-catalog. Its binding is defined as follows:
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