Jaxb : Append field of Request XML without modfying JAXB java class

Question

I am using JAXB 2.0 for the Application Deveopment which is using RestFul Webservices . Now there is a modification in the request , that is i will be getting another filed/variable in the request XML .

<Root Id="567" att="758" />

Modified Request will be

 <Root Id="567" att="758" anotherfiledadded ="kiran" />

My question is , is it possible to automatically append that field (anotherfiledadded)in the UserData class (Without modifying the UserData ??)

The below is my UserData class

@XmlRootElement(name = "Root")
@XmlAccessorType(XmlAccessType.FIELD)

public class UserData {

    @XmlAttribute
    private String Id;

    @XmlAttribute
    private String att;

// getters and setters

I don't think it is possible. Would you be getting too many such "unknown" fields? — adarshr, Aug 06 '12 at 12:16
http://stackoverflow.com/questions/11834573/insert-logic-code-into-generated-jaxb-java-files-by-xsd-def , the link has solved your question. — Ross Bu, Aug 06 '12 at 19:39
reference link http://stackoverflow.com/questions/11834573/insert-logic-code-into-generated-jaxb-java-files-by-xsd-def which has solved the problem in the example — Ross Bu, Aug 06 '12 at 19:41

score 1 · Accepted Answer · answered Aug 06 '12 at 13:49

1

You can try adding the field at runtime with javassist. But... It looks like you would also require to add the Annotation @XmlAttribute and I don't know if javassist allows you to add annotations... Anyways give it a try.

See: Javassist Add

answered Aug 06 '12 at 13:49

davidmontoyago

1,834
14
18

score 0 · Answer 2 · answered Aug 06 '12 at 15:02

You could use XSLT to apply an attribute into your XML document. All of the classes below are available in the JDK/JRE since Java SE 6.

JAXBContext jc = JAXBContext.newInstance(UserData.class); 
JAXBSource source = new JAXBSource(jc, myUserData);

StreamResult result = new StreamResult(System.out);

TransformerFactory tf = TransformerFactory.newInstance();
StreamSource xslt = new StreamSource("addMyAttribute.xslt");
Transformer t = tf.newTransformer(xslt);
t.transform(source, result);

If you are implementing your RESTful service using JAX-RS you could plug-in this logic via a MessageBodyWriter:

Jaxb : Append field of Request XML without modfying JAXB java class

2 Answers2

Linked