JAXB2 Inheritance Plugin

Inheritance Plugin

Makes schema-derived classes extend certain class or implement certain interfaces.

Activation

Activate the plugin using -Xinheritance switch.

<execution>
  <goals>
    <goal>generate</goal>
  </goals>
  <configuration>
    <bindingDirectory>
      ${basedir}/src/main/resources/....
    </bindingDirectory>
    <extension>true</extension>
    <args>
      <arg>-Xinheritance</arg>
    </args>
    <plugins>
      <plugin>
        <groupId>org.jvnet.jaxb</groupId>
        <artifactId>jaxb2-basics</artifactId>
      </plugin>
    </plugins>
  </configuration>
</execution>

Configuration

• Declare the http://jaxb2-commons.dev.java.net/basic/inheritance customization namespace (or starting with v3 of the plugin, the new urn:jaxb.jvnet.org:plugin:inheritance namespace).
• Use <inheritance:extends>com.acme.foo.MyClass</inheritance:extends> or <inheritance:implements>com.acme.foo.MyInterface</inheritance:implements> customization elements to specify which classes or interfaces should your schema-derived class extend or implement.
• Use <inheritance:objectFactory packageName="com.acme.foo"/> to customize the object factory class.

Works with class outlines, enum outlines, element and package outlines.

Example XSD / XJB (JAXB 2)

schema.xsd example file :

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
  xmlns:inheritance="http://jaxb2-commons.dev.java.net/basic/inheritance"
  jaxb:version="2.1"
  jaxb:extensionBindingPrefixes="inheritance">
 
  <!-- ... -->
 
  <xs:annotation>
    <xs:appinfo>
      <jaxb:schemaBindings>
        <jaxb:package name="com.acme.foo" />
      </jaxb:schemaBindings>
      <inheritance:objectFactory packageName="com.acme.foo">
        <inheritance:implements>java.lang.Cloneable</inheritance:implements>
      </inheritance:objectFactory>
    </xs:appinfo>
  </xs:annotation>
 
  <!-- ... -->
 
  <xs:complexType name="WillBeMadeCloneableType">
    <xs:annotation>
      <xs:appinfo>
        <inheritance:implements>java.lang.Cloneable</inheritance:implements>
      </xs:appinfo>
    </xs:annotation>
    <!-- ... -->
  </xs:complexType>
 
  <!-- ... -->
 
</xs:schema>

bindings.xjb example file :

<jaxb:bindings
  xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
  xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  xmlns:inheritance="http://jaxb2-commons.dev.java.net/basic/inheritance"
  jaxb:extensionBindingPrefixes="inheritance"
  jaxb:version="2.1">
 
  <jaxb:bindings schemaLocation="schema.xsd" node="/xsd:schema">
    <jaxb:bindings node="xsd:simpleType[@name='issueJIIB38Type']">
      <inheritance:implements>java.lang.Cloneable</inheritance:implements>
    </jaxb:bindings>
    <jaxb:bindings node="xsd:element[@name='issueJIIB38']">
      <jaxb:class/>
      <inheritance:implements>java.lang.Cloneable</inheritance:implements>
    </jaxb:bindings>
  </jaxb:bindings>
</jaxb:bindings>

Example XSD / XJB (JAXB 3)

schema.xsd example file :

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns:jaxb="https://jakarta.ee/xml/ns/jaxb"
  xmlns:inheritance="urn:jaxb.jvnet.org:plugin:inheritance"
  jaxb:version="3.0"
  jaxb:extensionBindingPrefixes="inheritance">
 
  <!-- ... -->
 
  <xs:annotation>
    <xs:appinfo>
      <jaxb:schemaBindings>
        <jaxb:package name="com.acme.foo" />
      </jaxb:schemaBindings>
      <inheritance:objectFactory packageName="com.acme.foo">
        <inheritance:implements>java.lang.Cloneable</inheritance:implements>
      </inheritance:objectFactory>
    </xs:appinfo>
  </xs:annotation>
 
  <!-- ... -->
 
  <xs:complexType name="WillBeMadeCloneableType">
    <xs:annotation>
      <xs:appinfo>
        <inheritance:implements>java.lang.Cloneable</inheritance:implements>
      </xs:appinfo>
    </xs:annotation>
    <!-- ... -->
  </xs:complexType>
 
  <!-- ... -->
 
</xs:schema>

bindings.xjb example file :

<jaxb:bindings
	xmlns:jaxb="https://jakarta.ee/xml/ns/jaxb"
	xmlns:xsd="http://www.w3.org/2001/XMLSchema"
	xmlns:inheritance="urn:jaxb.jvnet.org:plugin:inheritance"
	jaxb:extensionBindingPrefixes="inheritance"
	jaxb:version="3.0">

  <jaxb:bindings schemaLocation="schema.xsd" node="/xsd:schema">
    <jaxb:bindings node="xsd:simpleType[@name='issueJIIB38Type']">
      <inheritance:implements>java.lang.Cloneable</inheritance:implements>
    </jaxb:bindings>
    <jaxb:bindings node="xsd:element[@name='issueJIIB38']">
      <jaxb:class/>
      <inheritance:implements>java.lang.Cloneable</inheritance:implements>
    </jaxb:bindings>
  </jaxb:bindings>
</jaxb:bindings>

Support for generics

Assume you have a generic interface :

public interface IssueJIIB48Interface<T> {
    public T getValue();
}

You can now use the following customization :

<xs:complexType name="issueJIIB48Type">
  <xs:annotation>
    <xs:appinfo>
      <inheritance:implements>org.jvnet.jaxb2_commons.tests.issues.IssueJIIB48Interface&lt;java.lang.String&gt;</inheritance:implements>
    </xs:appinfo>
  </xs:annotation>
  <xs:sequence>
    <xs:element name="value" type="xs:string"/>
  </xs:sequence>
</xs:complexType>

You'll get the following code :

public class IssueJIIB48Type
    implements IssueJIIB48Interface<String>
{
 
    @XmlElement(required = true)
    protected String value;
 
    public String getValue() {
        return value;
    }
 
    public void setValue(String value) {
        this.value = value;
    }
 
    // ...
}