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==Overview==
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== Using EclipseLink MOXy JAXB ==
 +
Java Architecture for XML Binding (JSR 222) is the standard for XML Binding in Java.  JAXB covers 100% of XML Schema concepts.  Learn how to use MOXy as your JAXB provider.:
 +
* [[EclipseLink/Examples/MOXy/JAXB/Compiler | Generating a Java Model from an XML Schema]]
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* [[EclipseLink/Examples/MOXy/JAXB/SpecifyRuntime | Specifying the EclipseLink MOXy JAXB Runtime]]
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* [[EclipseLink/Examples/MOXy/JAXB/Runtime | Using JAXB to Manipulate XML]]
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* [[EclipseLink/Examples/MOXy/JAXB/GenerateSchema | Generating an XML Schema from a Java Model]]
  
The following example will demonstrate how to use EclipseLink's JAXB functionality to:
 
* Generate JAXB-annotated Java classes from an XML Schema using the JAXB Compiler
 
* Unmarshal an XML Document
 
* Modify the XML data using the interfaces generated by the compiler
 
* Marshal the modified data to XML
 
  
==Setup==
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----
  
# Ensure that you have EclipseLink correctly installed and configured for your environment.  Please see [[EclipseLink/Installing and Configuring EclipseLink]] for more information.
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See the ''[http://www.eclipse.org/eclipselink/documentation/ Developing JAXB Applications Using EclipseLink MOXy]'' for complete information.
# Ensure that you have ANT correctly installed and configured.
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# Unzip the Example ZIP file to a new directory.
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# Edit the <tt>env.properties</tt> file in the root directory of the example and specify the path to your EclipseLink <tt>jlib</tt> directory:
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<pre>
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...
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# Edit eclipselink.jlib to point to your EclipseLink jlib directory
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eclipselink.jlib=C:/EclipseLink-1.0/eclipselink/jlib
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...
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</pre>
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You can compile and run the Example at any time by typing <tt>ant</tt> from the Example directory. 
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==Running the JAXB Compiler==
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The JAXB compiler can be run to generate JAXB-annotated Java classes from an XML Schema:
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<pre>
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<ECLIPSELINK_HOME>/eclipselink/bin/jaxb-compiler.sh <source-file.xsd> [-options]
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<ECLIPSELINK_HOME>\eclipselink\bin\jaxb-compiler.cmd <source-file.xsd> [-options]
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Options include:
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  -d <dir>                    Specifies the output directory for generated files
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  -p <pkg>                    Specifies the target package
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  -classpath <arg>            Specifies where to find user class files
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  -verbose                    Enable verbose output
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  -quiet                      Suppress compiler output
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  -version                    Display version information
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For a complete list of compiler options:
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  jaxb-compiler.sh -help
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Example:
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  jaxb-compiler.sh -d jaxb-compiler-output config/Customer.xsd
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</pre>
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In this example, the JAXB Compiler is run from the "<tt>run.jaxb.compiler</tt>" task in the ANT build file.
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==Creating a JAXBContext using jaxb.properties==
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The standard way to specify which JAXB implementation should be used is through a file called <tt>jaxb.properties</tt>, which contains a single property, <tt>javax.xml.bind.context.factory</tt>. This file must be available on the classpath in the corresponding package (in this example, "<tt>org.example.customer_example</tt>").  To specify that the EclipseLink JAXB implementation should be used, your <tt>jaxb.properties</tt> file should have the following content:
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<pre>
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javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
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</pre>
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In our example, we create the JAXBContext as follows:
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<pre>
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JAXBContext jaxbContext = JAXBContext.newInstance("org.example.customer_example");
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</pre>
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An alternate way to create a new JAXBContext is to supply an array of Class objects.  Again, the <tt>jaxb.properties</tt> file must be available on the classpath in the corresponding package:
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<pre>
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Class[] classes = new Class[4];
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classes[0] = org.example.customer_example.AddressType.class;
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classes[1] = org.example.customer_example.ContactInfo.class;
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classes[2] = org.example.customer_example.CustomerType.class;
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classes[3] = org.example.customer_example.PhoneNumber.class;
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JAXBContext jaxbContext = JAXBContext.newInstance(classes);
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</pre>
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==Unmarshalling the XML Document==
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With a JAXBContext created, we can now unmarshal an XML document using the statically generated classes:
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<pre>
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File file = new File("Customer-data.xml");
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Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
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StreamSource source = new StreamSource(file);
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JAXBElement customerElement = unmarshaller.unmarshal(source, CustomerType.class);
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CustomerType customer = (CustomerType) customerElement.getValue();
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</pre>
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==Modify the Objects==
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Below are examples of manipulating the XML data using the JAXB-generated static classes. Note that there are JavaBean-type accessors on the static interfaces.
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Modifying the ShippingAddress ZipCode:
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<pre>
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customer.getContactInfo().getShippingAddress().setZipCode("27601");
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</pre>
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Adding a new PhoneNumber:
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<pre>
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PhoneNumber homePhoneNumber  = new ObjectFactory().createPhoneNumber();
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homePhoneNumber.setType("home");
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homePhoneNumber.setValue("(613) 555-3333");
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customer.getContactInfo().getPhoneNumber().add(homePhoneNumber);
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</pre>
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Note the use of the <tt>ObjectFactory</tt> class to create a new <tt>PhoneNumber</tt> object.  In addition to generating the model classes used in this example, the JAXB compiler also generates an <tt>ObjectFactory</tt> class that can be used to create any of the generated types.
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Removing all "cell" PhoneNumbers:
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<pre>
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ArrayList phoneNumbersToRemove = new ArrayList();
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List phoneNumbers = customer.getContactInfo().getPhoneNumber();
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Iterator it = phoneNumbers.iterator();
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while (it.hasNext()) {
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    PhoneNumber phoneNumber = (PhoneNumber) it.next();
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    if (phoneNumber.getType().equals("cell")) {
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        phoneNumbersToRemove.add(phoneNumber);
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    }
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}
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phoneNumbers.removeAll(phoneNumbersToRemove);
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</pre>
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==Marshalling the Objects to XML==
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The following code segment demonstrates how to marshal Customer objects back to XML. In this example the stream we are saving to is System.out, so the XML text will be printed to the console.
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<pre>
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Marshaller marshaller = jaxbContext.createMarshaller();
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marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
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marshaller.marshal(customerElement, System.out);
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</pre>
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==Download==
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[http://wiki.eclipse.org/images/8/85/Org.eclipse.persistence.example.jaxb.zip org.eclipse.persistence.example.jaxb.zip]
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Latest revision as of 18:59, 1 February 2013

Using EclipseLink MOXy JAXB

Java Architecture for XML Binding (JSR 222) is the standard for XML Binding in Java. JAXB covers 100% of XML Schema concepts. Learn how to use MOXy as your JAXB provider.:



See the Developing JAXB Applications Using EclipseLink MOXy for complete information.