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<div class="sect1"><!-- infolevel="all" infotype="General" -->
<h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Validating Against an XML Schema</font></h1>
<p>If you would like to validate your objects against an XML Schema during marshalling and unmarshalling, you can make use of JAXB's <code>ValidationEventHandler</code>.</p>
<div class="example"><a id="TLJAX169" name="TLJAX169"></a><a id="sthref44" name="sthref44"></a>
<p><strong><em><font face="arial, helvetica, sans-serif">Example 2-25 Sample XML Schema</font></em></strong></p>
<p>In this example we would like to validate our objects against the following XML schema:</p>
<pre xml:space="preserve" class="oac_no_warn">
&lt;xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"&gt;
&lt;xs:element name="customer"&gt;
&lt;xs:complexType&gt;
&lt;xs:sequence&gt;
&lt;xs:element <strong>name="name" type="stringMaxSize5"</strong>/&gt;
&lt;xs:element <strong>ref="phone-number" maxOccurs="2"</strong>/&gt;
&lt;/xs:sequence&gt;
&lt;/xs:complexType&gt;
&lt;/xs:element&gt;
&lt;xs:element name="phone-number"&gt;
&lt;xs:complexType&gt;
&lt;xs:sequence/&gt;
&lt;/xs:complexType&gt;
&lt;/xs:element&gt;
&lt;xs:simpleType name="stringMaxSize5"&gt;
&lt;xs:restriction base="xs:string"&gt;
&lt;xs:maxLength value="5"/&gt;
&lt;/xs:restriction&gt;
&lt;/xs:simpleType&gt;
&lt;/xs:schema&gt;
</pre></div>
<!-- class="example" -->
<p>Notice the following constraints:</p>
<ul>
<li>
<p>The customer's name cannot be longer than five (5) characters.</p>
</li>
<li>
<p>The customer cannot have more than two (2) phone numbers.</p>
</li>
</ul>
<p>The <strong>Customer</strong> class is shown below. Notice that the class <em>does not</em> contain any validation code.</p>
<div class="example"><a id="TLJAX170" name="TLJAX170"></a><a id="sthref45" name="sthref45"></a>
<p><strong><em><font face="arial, helvetica, sans-serif">Example 2-26 Sample Customer Class</font></em></strong></p>
<pre xml:space="preserve" class="oac_no_warn">
package example;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Customer {
private String name;
private List&lt;PhoneNumber&gt; phoneNumbers = new ArrayList&lt;PhoneNumber&gt;();
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@XmlElement(name="phone-number")
public List&lt;PhoneNumber&gt; getPhoneNumbers() {
return phoneNumbers;
}
public void setPhoneNumbers(List&lt;PhoneNumber&gt; phoneNumbers) {
this.phoneNumbers = phoneNumbers;
}
}
</pre></div>
<!-- class="example" -->
<a id="TLJAX171" name="TLJAX171"></a>
<div class="sect2"><a id="sthref46" name="sthref46"></a>
<h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">Using a ValidationEventHandler</font></h2>
<p>You can receive JAXB validation events by providing your own subclass of <code>ValidationEventHandler</code>. The event is represented as an instance of <code>ValidationEvent</code>, and provides many details about the issue. The data is similar to what is available from a <code>SAXParseException</code>.</p>
<ul>
<li>
<p>Returning <strong>false</strong> from the <code>handleEvent</code> method will cause the JAXB operation to stop.</p>
</li>
<li>
<p>Returning <strong>true</strong> will allow the method to continue, if possible.</p>
</li>
</ul>
<p>In <a href="#CACGDDBA">Example 2-27</a>, we will simply print out an event's data when one is received:</p>
<div class="example"><a id="CACGDDBA" name="CACGDDBA"></a><a id="TLJAX172" name="TLJAX172"></a>
<p><strong><em><font face="arial, helvetica, sans-serif">Example 2-27 Sample ValidationEventHandler</font></em></strong></p>
<pre xml:space="preserve" class="oac_no_warn">
package example;
import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;
public class MyValidationEventHandler implements ValidationEventHandler {
public boolean handleEvent(ValidationEvent event) {
System.out.println("\nEVENT");
System.out.println("SEVERITY: " + event.getSeverity());
System.out.println("MESSAGE: " + event.getMessage());
System.out.println("LINKED EXCEPTION: " + event.getLinkedException());
System.out.println("LOCATOR");
System.out.println(" LINE NUMBER: " + event.getLocator().getLineNumber());
System.out.println(" COLUMN NUMBER: " + event.getLocator().getColumnNumber());
System.out.println(" OFFSET: " + event.getLocator().getOffset());
System.out.println(" OBJECT: " + event.getLocator().getObject());
System.out.println(" NODE: " + event.getLocator().getNode());
System.out.println(" URL: " + event.getLocator().getURL());
return true;
}
}
</pre></div>
<!-- class="example" --></div>
<!-- class="sect2" -->
<a id="TLJAX173" name="TLJAX173"></a>
<div class="sect2"><a id="sthref47" name="sthref47"></a>
<h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">Enabling Validation</font></h2>
<p>In addition to providing an implementation of <code>ValidationEventHandler</code>, an instance of <code>Schema</code> must be set on the <code>Marshaller</code> or <code>Unmarshaller</code>.</p>
<div class="example"><a id="TLJAX174" name="TLJAX174"></a><a id="sthref48" name="sthref48"></a>
<p><strong><em><font face="arial, helvetica, sans-serif">Example 2-28 Sample Java Code</font></em></strong></p>
<pre xml:space="preserve" class="oac_no_warn">
package example;
import java.io.File;
import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
public class UnmarshalDemo {
public static void main(String[] args) throws Exception {
SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = sf.newSchema(new File("customer.xsd"));
JAXBContext jc = JAXBContext.newInstance(Customer.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
<strong>unmarshaller.setSchema(schema);</strong>
unmarshaller.setEventHandler(new MyValidationEventHandler());
Customer customer = (Customer) unmarshaller.unmarshal(new File("input.xml"));
}
}
</pre></div>
<!-- class="example" -->
<a id="TLJAX175" name="TLJAX175"></a>
<div class="sect3"><a id="sthref49" name="sthref49"></a>
<h3 class="sect3"><font face="arial, helvetica, sans-serif" color="#330099">Input (input.xml File)</font></h3>
<pre xml:space="preserve" class="oac_no_warn">
&lt;customer&gt;
&lt;name&gt;Jane Doe&lt;/name&gt;
&lt;phone-number/&gt;
&lt;phone-number/&gt;
&lt;phone-number/&gt;
&lt;/customer&gt;
</pre></div>
<!-- class="sect3" -->
<a id="TLJAX176" name="TLJAX176"></a>
<div class="sect3"><a id="sthref50" name="sthref50"></a>
<h3 class="sect3"><font face="arial, helvetica, sans-serif" color="#330099">Output</font></h3>
<p>The validation performed during the unmarshal raised three events. The first two events are related to the text value of the <strong>name</strong> element being too long. The third event is related to the extra <strong>phone-number</strong> element.</p>
<pre xml:space="preserve" class="oac_no_warn">
EVENT
SEVERITY: 1
MESSAGE: cvc-maxLength-valid: Value 'Jane Doe' with length = '8' is not facet-valid with respect
to maxLength '5' for type 'stringWithMaxSize5'.
LINKED EXCEPTION: org.xml.sax.SAXParseException: cvc-maxLength-valid: Value 'Jane Doe' with length = '8'
is not facet-valid with respect to maxLength '5' for type 'stringWithMaxSize5'.
LOCATOR
LINE NUMBER: 3
COLUMN NUMBER: 25
OFFSET: -1
OBJECT: null
NODE: null
URL: null
EVENT
SEVERITY: 1
MESSAGE: cvc-type.3.1.3: The value 'Jane Doe' of element 'name' is not valid.
LINKED EXCEPTION: org.xml.sax.SAXParseException: cvc-type.3.1.3: The value 'Jane Doe' of element
'name' is not valid.
LOCATOR
LINE NUMBER: 3
COLUMN NUMBER: 25
OFFSET: -1
OBJECT: null
NODE: null
URL: null
EVENT
SEVERITY: 1
MESSAGE: cvc-complex-type.2.4.d: Invalid content was found starting with element 'customer'. No child
element '{phone-number}' is expected at this point.
LINKED EXCEPTION: org.xml.sax.SAXParseException: cvc-complex-type.2.4.d: Invalid content was found starting
with element 'customer'. No child element '{phone-number}' is expected at this point.
LOCATOR
LINE NUMBER: 7
COLUMN NUMBER: 12
OFFSET: -1
OBJECT: null
NODE: null
URL: null
</pre></div>
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