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 <h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Using the Embedded Key Class</font></h1>
 <p>With JAXB, you can derive an XML representation from a set of JPA entities, when a JPA entity has an embedded ID class.</p>
 <p>In <a href="#BABIJHJI">Example 7-4</a>, the <code>EmployeeId</code> is the embedded ID of the <strong>Employee</strong> class:</p>
 <div class="example"><a id="BABIJHJI" name="BABIJHJI"></a><a id="TLJAX351" name="TLJAX351"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Example 7-4 Sample Embedded ID</font></em></strong></p>
 <pre xml:space="preserve" class="oac_no_warn">
 @Entity
 public class PhoneNumber {

     @ManyToOne
     @JoinColumns({
         @JoinColumn(name="E_ID", referencedColumnName = "E_ID"),
         @JoinColumn(name="E_COUNTRY", referencedColumnName = "COUNTRY")
     })
     private Employee contact;

 }

 @Entity
 @IdClass(EmployeeId.class)
 public class Employee {

     <strong>@EmbeddedId</strong>
     private EmployeeId id;

     @OneToMany(mappedBy="contact")
     private List&lt;PhoneNumber&gt; contactNumber;

 }

 @Embeddable
 public class EmployeeId {

     @Column(name="E_ID")
     private BigDecimal eId;

     private String country;

 }

 </pre></div>
 <!-- class="example" -->
 <p>For the JAXB bindings, the XML accessor type will be set to <strong>FIELD</strong> for all the model classes. This can be set as a package level JAXB annotation, as shown here:</p>
 <pre xml:space="preserve" class="oac_no_warn">
 @XmlAccessorType(XmlAccessType.FIELD)
 package com.example.model;

 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;

 </pre>
 <p><a href="#BABHCDEJ">Example 7-5</a> uses the EclipseLink extension <code>@XmlCustomizer</code> which extends the JAXB specification. Because the contact attribute is a bidirectional relationship, it includes the EclipseLink extension <code>@XmlInverseReference</code>.</p>
 <div class="example"><a id="BABHCDEJ" name="BABHCDEJ"></a><a id="TLJAX352" name="TLJAX352"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Example 7-5 Using the @XmlCustomizer Annotation</font></em></strong></p>
 <pre xml:space="preserve" class="oac_no_warn">
 @Entity
 @IdClass(EmployeeId.class)
 <strong>@XmlCustomizer(EmployeeCustomizer.class)</strong>
 public class Employee {

     @EmbeddedId
     private EmployeeId id;

     @OneToMany(mappedBy="contact")
     @XmlInverseReference(mappedBy="contact")
     private List&lt;PhoneNumber&gt; contactNumber;

 }

 </pre></div>
 <!-- class="example" -->
 <p>To embed the content of the <strong>EmployeeId</strong> class in the complex type corresponding to the <strong>Employee</strong> class, change the XPath on the mapping for the <code>id</code> property to be <em>self</em> or<strong>&nbsp;.&nbsp;</strong>. Then specify the XPath to the XML nodes which represent the ID.</p>
 <div class="example"><a id="TLJAX353" name="TLJAX353"></a><a id="sthref133" name="sthref133"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Example 7-6 Changing the XPath</font></em></strong></p>
 <pre xml:space="preserve" class="oac_no_warn">
 import org.eclipse.persistence.config.DescriptorCustomizer;
 import org.eclipse.persistence.descriptors.ClassDescriptor;
 import org.eclipse.persistence.oxm.mappings.XMLCompositeObjectMapping;

 public class EmployeeCustomizer implements DescriptorCustomizer {

     public void customize(ClassDescriptor descriptor) throws Exception {
         XMLCompositeObjectMapping idMapping =
             (XMLCompositeObjectMapping) descriptor.getMappingForAttributeName("id");
         <strong>idMapping.setXPath(".");</strong>

         descriptor.addPrimaryKeyFieldName("eId/text()");
         descriptor.addPrimaryKeyFieldName("country/text()");
     }

 }

 </pre></div>
 <!-- class="example" -->
 <p>If the target object had a single ID then we would use <code>@XmlIDREF</code>. Since the target object has a compound key, we will mark the field <code>@XmlTransient</code>, and use the EclipseLink extension <code>@XmlCustomizer</code> to set up the mapping.</p>
 <div class="example"><a id="TLJAX354" name="TLJAX354"></a><a id="sthref134" name="sthref134"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Example 7-7 Using the @XmlTransient Annotation</font></em></strong></p>
 <pre xml:space="preserve" class="oac_no_warn">
 @Entity
 @XmlCustomizer(PhoneNumberCustomizer.class)
 public class PhoneNumber {

     @ManyToOne
     @JoinColumns({
         @JoinColumn(name="E_ID", referencedColumnName = "E_ID"),
         @JoinColumn(name="E_COUNTRY", referencedColumnName = "COUNTRY")
     })
     <strong>@XmlTransient</strong>
     private Employee contact;

 }

 </pre></div>
 <!-- class="example" -->
 <p>An <code>XMLObjectReferenceMapping</code> will be created. The mapping will include multiple key mappings.</p>
 <pre xml:space="preserve" class="oac_no_warn">
 import org.eclipse.persistence.config.DescriptorCustomizer;
 import org.eclipse.persistence.descriptors.ClassDescriptor;
 import org.eclipse.persistence.oxm.mappings.XMLObjectReferenceMapping;

 public class PhoneNumberCustomizer implements DescriptorCustomizer {

     public void customize(ClassDescriptor descriptor) throws Exception {
         XMLObjectReferenceMapping contactMapping = new XMLObjectReferenceMapping();
         contactMapping.setAttributeName("contact");
         contactMapping.setReferenceClass(Employee.class);
         contactMapping.addSourceToTargetKeyFieldAssociation("contact/@eID", "eId/text()");
         contactMapping.addSourceToTargetKeyFieldAssociation("contact/@country", "country/text()");
         descriptor.addMapping(contactMapping);
     }

 }
 </pre></div>
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	<div class="sect1"><!-- infolevel="all" infotype="General" --><a id="sthref132" name="sthref132"></a>
	<h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Using the Embedded Key Class</font></h1>
	<p>With JAXB, you can derive an XML representation from a set of JPA entities, when a JPA entity has an embedded ID class.</p>
	<p>In <a href="#BABIJHJI">Example 7-4</a>, the <code>EmployeeId</code> is the embedded ID of the <strong>Employee</strong> class:</p>
	<div class="example"><a id="BABIJHJI" name="BABIJHJI"></a><a id="TLJAX351" name="TLJAX351"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Example 7-4 Sample Embedded ID</font></em></strong></p>
	<pre xml:space="preserve" class="oac_no_warn">
	@Entity
	public class PhoneNumber {

	@ManyToOne
	@JoinColumns({
	@JoinColumn(name="E_ID", referencedColumnName = "E_ID"),
	@JoinColumn(name="E_COUNTRY", referencedColumnName = "COUNTRY")
	})
	private Employee contact;

	}

	@Entity
	@IdClass(EmployeeId.class)
	public class Employee {

	<strong>@EmbeddedId</strong>
	private EmployeeId id;

	@OneToMany(mappedBy="contact")
	private List<PhoneNumber> contactNumber;

	}

	@Embeddable
	public class EmployeeId {

	@Column(name="E_ID")
	private BigDecimal eId;

	private String country;

	}

	</pre></div>
	<!-- class="example" -->
	<p>For the JAXB bindings, the XML accessor type will be set to <strong>FIELD</strong> for all the model classes. This can be set as a package level JAXB annotation, as shown here:</p>
	<pre xml:space="preserve" class="oac_no_warn">
	@XmlAccessorType(XmlAccessType.FIELD)
	package com.example.model;

	import javax.xml.bind.annotation.XmlAccessType;
	import javax.xml.bind.annotation.XmlAccessorType;

	</pre>
	<p><a href="#BABHCDEJ">Example 7-5</a> uses the EclipseLink extension <code>@XmlCustomizer</code> which extends the JAXB specification. Because the contact attribute is a bidirectional relationship, it includes the EclipseLink extension <code>@XmlInverseReference</code>.</p>
	<div class="example"><a id="BABHCDEJ" name="BABHCDEJ"></a><a id="TLJAX352" name="TLJAX352"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Example 7-5 Using the @XmlCustomizer Annotation</font></em></strong></p>
	<pre xml:space="preserve" class="oac_no_warn">
	@Entity
	@IdClass(EmployeeId.class)
	<strong>@XmlCustomizer(EmployeeCustomizer.class)</strong>
	public class Employee {

	@EmbeddedId
	private EmployeeId id;

	@OneToMany(mappedBy="contact")
	@XmlInverseReference(mappedBy="contact")
	private List<PhoneNumber> contactNumber;

	}

	</pre></div>
	<!-- class="example" -->
	<p>To embed the content of the <strong>EmployeeId</strong> class in the complex type corresponding to the <strong>Employee</strong> class, change the XPath on the mapping for the <code>id</code> property to be <em>self</em> or<strong> . </strong>. Then specify the XPath to the XML nodes which represent the ID.</p>
	<div class="example"><a id="TLJAX353" name="TLJAX353"></a><a id="sthref133" name="sthref133"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Example 7-6 Changing the XPath</font></em></strong></p>
	<pre xml:space="preserve" class="oac_no_warn">
	import org.eclipse.persistence.config.DescriptorCustomizer;
	import org.eclipse.persistence.descriptors.ClassDescriptor;
	import org.eclipse.persistence.oxm.mappings.XMLCompositeObjectMapping;

	public class EmployeeCustomizer implements DescriptorCustomizer {

	public void customize(ClassDescriptor descriptor) throws Exception {
	XMLCompositeObjectMapping idMapping =
	(XMLCompositeObjectMapping) descriptor.getMappingForAttributeName("id");
	<strong>idMapping.setXPath(".");</strong>

	descriptor.addPrimaryKeyFieldName("eId/text()");
	descriptor.addPrimaryKeyFieldName("country/text()");
	}

	}

	</pre></div>
	<!-- class="example" -->
	<p>If the target object had a single ID then we would use <code>@XmlIDREF</code>. Since the target object has a compound key, we will mark the field <code>@XmlTransient</code>, and use the EclipseLink extension <code>@XmlCustomizer</code> to set up the mapping.</p>
	<div class="example"><a id="TLJAX354" name="TLJAX354"></a><a id="sthref134" name="sthref134"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Example 7-7 Using the @XmlTransient Annotation</font></em></strong></p>
	<pre xml:space="preserve" class="oac_no_warn">
	@Entity
	@XmlCustomizer(PhoneNumberCustomizer.class)
	public class PhoneNumber {

	@ManyToOne
	@JoinColumns({
	@JoinColumn(name="E_ID", referencedColumnName = "E_ID"),
	@JoinColumn(name="E_COUNTRY", referencedColumnName = "COUNTRY")
	})
	<strong>@XmlTransient</strong>
	private Employee contact;

	}

	</pre></div>
	<!-- class="example" -->
	<p>An <code>XMLObjectReferenceMapping</code> will be created. The mapping will include multiple key mappings.</p>
	<pre xml:space="preserve" class="oac_no_warn">
	import org.eclipse.persistence.config.DescriptorCustomizer;
	import org.eclipse.persistence.descriptors.ClassDescriptor;
	import org.eclipse.persistence.oxm.mappings.XMLObjectReferenceMapping;

	public class PhoneNumberCustomizer implements DescriptorCustomizer {

	public void customize(ClassDescriptor descriptor) throws Exception {
	XMLObjectReferenceMapping contactMapping = new XMLObjectReferenceMapping();
	contactMapping.setAttributeName("contact");
	contactMapping.setReferenceClass(Employee.class);
	contactMapping.addSourceToTargetKeyFieldAssociation("contact/@eID", "eId/text()");
	contactMapping.addSourceToTargetKeyFieldAssociation("contact/@country", "country/text()");
	descriptor.addMapping(contactMapping);
	}

	}
	</pre></div>
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