XSD class generation using XJC produces dead code for Boolean values - xsd

Question

I have the following XDS that represents various metadata item types:
<xs:simpleType name="BooleanTypeKey">
<xs:restriction base="xs:string">
<xs:enumeration value="isValue1" />
<xs:enumeration value="isValue2" />
<xs:enumeration value="isValue3" />
</xs:restriction>
</xs:simpleType>
<xs:complexType name="BooleanType">
<xs:simpleContent>
<xs:extension base="xs:boolean">
<xs:attribute name="key" type="BooleanTypeKey" use="required" />
</xs:extension>
</xs:simpleContent>
</xs:complexType>
Using the following xjc to produce my classes:
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>1.6</version>
<executions>
<execution>
<id>myId</id>
<goals>
<goal>xjc</goal>
</goals>
<configuration>
<packageName>com.myorg.packagename.model</packageName>
<schemaDirectory>/src/main/resources/xsd</schemaDirectory>
<bindingDirectory>/src/main/resources/xjb</bindingDirectory>
<outputDirectory>${project.build.directory}/generated/jaxb</outputDirectory>
<extension>true</extension>
<enableIntrospection>true</enableIntrospection>
<arguments>-Xequals -xhasCode -xtoString</arguments>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.jvnet.jaxb2_commons</groupId>
<artifactId>jaxb2-basics</artifactId>
<version>0.6.4</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
This produces the following class for the BooleanType object:
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "BooleanType", propOrder = {
"value"
})
public class BooleanType implements Equals, HashCode, ToString
{
#XmlValue
protected Boolean value;
#XmlAttribute(name = "key", required = true)
protected BooleanTypeKey key;
//... getters and setters ...
public boolean equals(ObjectLocator thisLocator, ObjectLocator thatLocator, Object object, EqualsStrategy strategy) {
//... basic object checks ...
final BooleanType that = ((BooleanType) object);
{
// This is NOT part of the generated code
// Why does the next 2 lines look like they do??? It should only read:
// boolean lhsValue = this.isValue();
// The fact that there is a check for *true*
// (constant value check... really???)
// Not only is this completely useless, but it causes dead code production (the else part (false)).
boolean lhsValue;
lhsValue = (true?this.isValue():false);
boolean rhsValue;
rhsValue = (true?that.isValue():false);
//...more code ...
}
//...more code ...
}
}
Can someone tell me if I can avoid producing such code, I am using a faulty version of xjc? A version that is too old?
Thanks,