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    <blockquote> <p>Make minOccurs 1, to make month required;</p> </blockquote> <p>The default value for <code>minOccurs</code> is one, so the <code>month</code> element is required. Note how <code>minOccurs="0"</code> had to be added to <code>userLogin</code> to make it optional.</p> <pre><code>&lt;xs:complexType name="wsData"&gt; &lt;xs:sequence&gt; &lt;xs:element name="month" type="xs:string"/&gt; &lt;xs:element minOccurs="0" name="userLogin" type="xs:string"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; </code></pre> <blockquote> <p>Validate month with its generated restriction (without a XmlAdapter).</p> </blockquote> <p>You can set an instance of <code>Schema</code> on the Unmarshaller to have the input validated:</p> <ul> <li><a href="http://blog.bdoughan.com/2010/12/jaxb-and-marshalunmarshal-schema.html" rel="noreferrer">http://blog.bdoughan.com/2010/12/jaxb-and-marshalunmarshal-schema.html</a></li> </ul> <p><strong>Demo</strong></p> <p>The following code can be used to generate the XML schema:</p> <pre><code>package forum9111936; import java.io.IOException; import javax.xml.bind.JAXBContext; import javax.xml.bind.SchemaOutputResolver; import javax.xml.transform.Result; import javax.xml.transform.stream.StreamResult; public class Demo { public static void main(String[] args) throws Exception { JAXBContext jc = JAXBContext.newInstance(WSData.class); SchemaOutputResolver sor = new SchemaOutputResolver() { @Override public Result createOutput(String namespaceUri, String suggestedFileName) throws IOException { StreamResult result = new StreamResult(System.out); result.setSystemId(suggestedFileName); return result; } }; jc.generateSchema(sor); System.out.println(); } } </code></pre> <hr/> <p><strong>UPDATE</strong></p> <p>The JAXB RI normally throws a <code>ValidationEvent</code> of severity 1 for conversion issues. The default <code>ValidationEventHandler</code> ignores all issues of severity less than 2. This normally results in the value being set to null. You can override the <code>ValidationEventHandler</code> as follows:</p> <pre><code> unmarshaller.setEventHandler(new ValidationEventHandler() { @Override public boolean handleEvent(ValidationEvent event) { System.out.println(event); return event.getSeverity() &lt; ValidationEvent.ERROR; } }); </code></pre> <p>However the JAXB RI does not appear to throw events related to converting enum values (possible bug). If you happen to be using EclipseLink JAXB (MOXy) as your JAXB provider then you will get an exception like:</p> <pre><code>Exception in thread "main" Local Exception Stack: Exception [EclipseLink-116] (Eclipse Persistence Services - 2.4.0.qualifier): org.eclipse.persistence.exceptions.DescriptorException Exception Description: No conversion value provided for the value [13] in field [month/text()]. Mapping: org.eclipse.persistence.oxm.mappings.XMLDirectMapping[month--&gt;month/text()] Descriptor: XMLDescriptor(forum9111936.WSData --&gt; []) at org.eclipse.persistence.exceptions.DescriptorException.noFieldValueConversionToAttributeValueProvided(DescriptorException.java:1052) at org.eclipse.persistence.mappings.converters.ObjectTypeConverter.convertDataValueToObjectValue(ObjectTypeConverter.java:140) at org.eclipse.persistence.oxm.mappings.XMLDirectMapping.getAttributeValue(XMLDirectMapping.java:287) at org.eclipse.persistence.internal.oxm.XMLDirectMappingNodeValue.endElement(XMLDirectMappingNodeValue.java:190) at org.eclipse.persistence.oxm.record.UnmarshalRecord.endElement(UnmarshalRecord.java:910) at org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parseEvent(XMLStreamReaderReader.java:133) at org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parse(XMLStreamReaderReader.java:83) at org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parse(XMLStreamReaderReader.java:72) at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:838) at org.eclipse.persistence.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:626) at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:472) at forum9111936.Demo2.main(Demo2.java:30) </code></pre> <p><strong>For More Information</strong></p> <ul> <li><a href="http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html" rel="noreferrer">http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html</a></li> </ul>
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    1. POWhat's the purpose of minOccurs, nillable and restriction?
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    1. COIf month is required, then why does it accepts null or month's absence (0 ocurrences)?
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    2. COAbout how to generate the schema.. What I know about the generation is that it is automatic here.. On JBoss startup something creates it given the web.xml mapping and WebService's and XmlXXX annotations and that's all. BTW, I guess that's not the point, my xsd is being generated properly. But it accepts 13 as an input for the month (unmarshalled to null), for example. Also, it accepts null and it's absence. Why? Creating an enumerations restriction and not creating will give me the same behavior of acceptance.
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    3. COI found that I can create an afterUnmarshal method to handle null's, for example, and it works, but what's the purpose of putting something with minOccurs 1 in xsd if it accepts 0 ocurrences and what's the purpose of creating a restriction (with enum) if it is not validated if the input value is in that 'range'?
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