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copied!<p>I don't see that problem at all. For me <code>xjc</code> generates a <code>Person</code> class with the properties <code>lat</code> and <code>lon</code> with type <code>Double</code>.</p> <p>If I unmarshall an XML file with no <code><lat></code> or <code><lon></code> elements, then the resulting <code>Person</code> objects has <code>null</code> values for those properties, as I'd expect.</p> <p>I don't know how you get <code>0.0</code> anywhere.</p> <p>My XML Schema:</p> <pre><code><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.com/person"> <xsd:element name="Person"> <xsd:complexType> <xsd:sequence> <xsd:element name="name" type="xsd:string" /> <xsd:element name="lat" type="xsd:double" minOccurs="0"/> <xsd:element name="lon" type="xsd:double" minOccurs="0"/> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema> </code></pre> <p>My <code>Test.java</code>:</p> <pre><code>import com.example.person.Person; import javax.xml.bind.JAXB; import java.io.File; public class Test { public static void main(String[] args) { Person p = JAXB.unmarshal(new File("foo.xml"), Person.class); System.out.println(p.getName()); System.out.println(p.getLat()); System.out.println(p.getLon()); } } </code></pre> <p>My <code>foo.xml</code>:</p> <pre><code><Person> <name>Fred</name> <lat>1.0</lat> </Person> </code></pre> <p>Output:</p> <pre>Fred 1.0 null </pre>

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