generated XSD From Java use moxy - jaxb

Question

#XmlRootElement
public class OtherClass {
#XmlAttribute
private String other;
}
#XmlRootElement
public class Simple extends OtherClass {
#XmlAttribute
private String id;
#XmlValue
public String contents;
}
JAXBContext context = JAXBContext.newInstance(OtherClass.class,Simple.class);
System.out.println(context);
System.out.println("org.eclipse.persistence.Version:"+Version.getVersionString());
context.generateSchema(new MySchemaOutputResolver());
System.out.println(sw);
Use woxy generated XSD results
org.eclipse.persistence.jaxb.JAXBContext#1292d26
org.eclipse.persistence.Version:2.5.0.v20130425-368d603
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:complexType name="otherClass">
<xsd:sequence/>
<xsd:attribute name="other" type="xsd:string"/>
</xsd:complexType>
<xsd:complexType name="simple">
<xsd:simpleContent>
<xsd:extension base="xsd:string">
<xsd:attribute name="id" type="xsd:string"/>
</xsd:extension>
</xsd:simpleContent>
</xsd:complexType>
<xsd:element name="otherClass" type="otherClass"/>
<xsd:element name="simple" type="simple"/>
</xsd:schema>
sample/other no inheritance in xsd, but there is in java
Excuse me, if to solve the problem? Here I thank you first

Answer 1

Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB (JSR-222) expert group.
What the Mappings Mean
With MOXy as your JAXB provider (see: http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html) you can use the folllowing code:
import java.io.File;
import javax.xml.bind.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Simple.class, OtherClass.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
File xml = new File("src/forum18029865/input.xml");
Simple simple = (Simple) unmarshaller.unmarshal(xml);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(simple, System.out);
}
}
to convert the following XML to/from your Java objects:
<?xml version="1.0" encoding="UTF-8"?>
<simple id="foo" other="bar">Hello World</simple>
How the Mappings Relate to XML Schema
The classes as you have mapped them don't have a real representation in XML schema. Since you have used the #XmlValue annotation the resulting type will extend xsd:string, but you have also indicated that it should extend the complex type corresponding to OtherClass.
What the JAXB Reference Implemenetation Does
For the exact same mappings the JAXB RI will through an exception when creating the JAXBContext. Since this representation is not allowed in the XML schema, they decide not to allow it in the mappings. I prefer the option we chose in MOXy where still support the mapping.
Exception in thread "main" com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
#XmlValue is not allowed on a class that derives another class.
this problem is related to the following location:
at public java.lang.String forum18029865.Simple.contents
at forum18029865.Simple
at com.sun.xml.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:102)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:472)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:302)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1140)
at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:154)
at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:121)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:248)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:235)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:432)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:637)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:584)
at forum18029865.Demo.main(Demo.java:9)