JAXB not creating member variables and getters and setters

Question

I am trying to generate Java classes form xsd schema and I am using JAXB. For the most part when I run the process to generate the classes it works. However there are a few classes that the member variable, getters , and setters are not generated. Here is what I have

File ns2.xsd

<xs:element name="Observation" type="ns2:ObservationType" substitutionGroup="ns1:_MetaData"/>
<xs:complexType name="ObservationType" mixed="true">
    <xs:complexContent mixed="true">
        <xs:extension base="ns1:AbstractType">
            <xs:sequence>
                    <xs:element ref="ns2:identifier"/>

            </xs:sequence>
        </xs:extension>
    </xs:complexContent>
</xs:complexType>

File ns3.xsd

<xs:element name="Observation" type="ns3:ObservationType" substitutionGroup="ns2:Observation"/>
<xs:complexType name="ObservationType" mixed="true">
    <xs:annotation>
        <xs:documentation>this extends the ns2:ObservationType </xs:documentation>
    </xs:annotation>
    <xs:complexContent mixed="true">
        <xs:extension base="ns2:ObservationType">
            <xs:sequence>
                <xs:element ref="ns3:deliveryInfo" minOccurs="0"/>
            </xs:sequence>
        </xs:extension>
    </xs:complexContent>
</xs:complexType>

This creates an empty class

package mypackage.ns3;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlType;


/**
 * this extends the ns2:ObservationType 
 * 
 * <p>Java class for ObservationType complex type.
 * 
 * <p>The following schema fragment specifies the expected content contained within this class.
 * 
 * <pre>
 * &lt;complexType name="ObservationType">
 *   &lt;complexContent>
 *     &lt;extension base="{http://earth.esa.int/ns2}ObservationType">
 *       &lt;sequence>
 *         &lt;element ref="{http://earth.esa.int/ns3}deliveryInfo" minOccurs="0"/>
 *       &lt;/sequence>
 *     &lt;/extension>
 *   &lt;/complexContent>
 * &lt;/complexType>
 * </pre>
 * 
 * 
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "ObservationType")
public class ObservationType
    extends mypackage.ns2.ObservationType
{


}

My question is why is not creating the required member variable and its setters and getters? Is there something wrong with the schema or is there a limitation on JAXB to create the missing information form complex types that use extensions from different files? Thank you in advance. Your help or comments will be appreciated.

Answer 1

What makes this use case odd is that you have inheritance in your XML Schema between two types with mixed content. I think there is an XJC (and possibly spec) bug here, and as suggested by Puce you should enter a bug for it at the following link:

• https://java.net/jira/browse/JAXB/

XML Schema

schema.xsd

Here is a simpler XML schema that reproduces the same issue:

<?xml version="1.0" encoding="UTF-8"?>
<schema 
    xmlns="http://www.w3.org/2001/XMLSchema" 
    targetNamespace="http://www.example.org/schema" 
    xmlns:tns="http://www.example.org/schema" 
    elementFormDefault="qualified">

    <complexType name="b" mixed="true">
                 <sequence>
                   <element ref="tns:bb"/>
                </sequence>
    </complexType>


    <complexType name="c">
        <complexContent mixed="true">
            <extension base="tns:b">
                <sequence>
                   <element ref="tns:cc"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>

    <element name="bb" type="string"/>

    <element name="cc" type="string"/>

</schema>

Incorrect Java Model

B

The class generated for the b type is fine.

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "b", propOrder = {"content"})
@XmlSeeAlso({C.class})
public class B {

    @XmlElementRef(name = "bb", namespace = "http://www.example.org/schema", type = JAXBElement.class)
    @XmlMixed
    protected List<Serializable> content;

    public List<Serializable> getContent() {
        if (content == null) {
            content = new ArrayList<Serializable>();
        }
        return this.content;
    }

}

C

The class generated for the c type is wrong, the question is what should it be?

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "c")
public class C extends B {


}

Better Java Model? - Option #1

You could add a property to the C class. The question then comes down to which of the mixed text goes on the property inherited from B and which goes in the property defined on C.

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "c")
public class C
    extends B
{

    @XmlElementRef(name = "cc", namespace = "http://www.example.org/schema", type = JAXBElement.class)
    @XmlMixed
    protected List<Serializable> content2;

}

Better Java Model? - Option #2

You could extend the property on B to be aware of the element reference from the c type. This will allow you to handle the XML correctly for the b and c types but would allows some documents that weren't valid against the XML schema.

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "b", propOrder = {"content"})
@XmlSeeAlso({C.class})
public class B {

    @XmlElementRefs({
        @XmlElementRef(name = "bb", namespace = "http://www.example.org/schema", type = JAXBElement.class),
        @XmlElementRef(name = "cc", namespace = "http://www.example.org/schema", type = JAXBElement.class)
    })
    @XmlMixed
    protected List<Serializable> content;

    public List<Serializable> getContent() {
        if (content == null) {
            content = new ArrayList<Serializable>();
        }
        return this.content;
    }

}