You could map all your properties to lower case node names, and then wrap an XMLStreamReader to call toLowerCase() on all attribute/element names it returned. Then unmarshal from that XMLStreamReader.
I have recently added an enhance request for EclipseLink JAXB (MOXy) for this issue, feel free to provide additional information:
Object Model
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Customer {
private int id;
private String name;
private Address address;
@XmlAttribute
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}
public class Address {
private String street;
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
}
Demo Code
import java.io.FileInputStream;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.util.StreamReaderDelegate;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Customer.class);
XMLInputFactory xif = XMLInputFactory.newInstance();
XMLStreamReader xsr = xif.createXMLStreamReader(new FileInputStream("input.xml"));
xsr = new MyStreamReaderDelegate(xsr);
Unmarshaller unmarshaller = jc.createUnmarshaller();
Customer customer = (Customer) unmarshaller.unmarshal(xsr);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(customer, System.out);
}
private static class MyStreamReaderDelegate extends StreamReaderDelegate {
public MyStreamReaderDelegate(XMLStreamReader xsr) {
super(xsr);
}
@Override
public String getAttributeLocalName(int index) {
return super.getAttributeLocalName(index).toLowerCase();
}
@Override
public String getLocalName() {
return super.getLocalName().toLowerCase();
}
}
}
Will read these XML documents:
<CUSTOMER ID="1">
<NAME>Jane Doe</NAME>
<ADDRESS>
<STREET>123 A Street</STREET>
</ADDRESS>
</CUSTOMER>
<CuSToMeR Id="1">
<NaMe>Jane Doe</NAME>
<AdDrEsS>
<STREET>123 A Street</STREET>
</AdDRrEsS>
</CuSToMeR>
And write the following XML:
<customer id="1">
<address>
<street>123 A Street</street>
</address>
<name>Jane Doe</name>
</customer>
Below is a link to a more detailed example:
UPDATE
Your code works in my environment (JDK 1.6.0_20 with both the included JAXB, and EclipseLink JAXB (MOXy) 2.2, I'm also using the default implementation of StAX). When I run your example:
import java.io.FileInputStream;
import java.util.List;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.util.StreamReaderDelegate;
public class Example {
private static class ToLowerCaseNamesStreamReaderDelegate extends StreamReaderDelegate {
public ToLowerCaseNamesStreamReaderDelegate(XMLStreamReader xsr) {
super(xsr);
}
@Override
public String getAttributeLocalName(int index) {
return super.getAttributeLocalName(index).toLowerCase();
}
@Override
public String getLocalName() {
return super.getLocalName().toLowerCase();
}
}
@XmlRootElement(name="doc")
static class Doc {
@XmlElement(name="element")
List<Element> elements;
}
static class Element {
@XmlAttribute(name = "abc")
String abc;
}
public static void main(String[] args) throws Exception {
XMLInputFactory xif = XMLInputFactory.newInstance();
XMLStreamReader xsr = xif.createXMLStreamReader(new FileInputStream("LowerCaseElementNamesFilterTest.xml"));
Unmarshaller u = JAXBContext.newInstance(Doc.class).createUnmarshaller();
//Do unmarshalling
Doc doc = (Doc) u.unmarshal(new ToLowerCaseNamesStreamReaderDelegate(xsr));
System.out.println(doc.elements.get(0).abc);
System.out.println(doc.elements.get(1).abc);
System.out.println(doc.elements.get(2).abc);
}
}
I get the following output:
1
1
2
UPDATE #2
To address:
Exception in thread "main"
javax.xml.bind.UnmarshalException -
with linked exception:
[javax.xml.bind.UnmarshalException:
Namespace URIs and local names to the
unmarshaller needs to be interned.] at
com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.handleStreamException(UnmarshallerImpl.java:425)
at
com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:362)
at
com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:332)
Have you tried modifying the delegate?:
@Override
public String getAttributeLocalName(int index) {
return super.getAttributeLocalName(index).toLowerCase().intern();
}
@Override
public String getLocalName() {
return super.getLocalName().toLowerCase().intern();
}
