custom wrapper object jaxb

XSD and wrappers are not related.

They're simply used for collections when using jaxb to marshall. Since collection classes are not known to the jaxb context, you create a wrapper object that is annotated with jaxb and let it wrap the underlying collection.

are they used for unmarshalling also?

please advise.

where xjc coming into picture in this?

Xjc is simply the binding compiler. Which can compile an xsd into java classes with JAXB.

is it alternate way of doing unmarshalling directly without writing the code like below

import java.io.File;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

import blog.thoughts.on.java.Item;

public class UnmarshallingDemo {

    public static void main (String [] args) {
        try {
            JAXBContext jc = JAXBContext.newInstance ("blog.thoughts.on.java");

            Unmarshaller u = jc.createUnmarshaller ();

           File f = new File ("item.xml");
           JAXBElement element = (JAXBElement) u.unmarshal (f);

           Item item = (Item) element.getValue ();
           System.out.println (item.getCode ());
           System.out.println (item.getName ());
           System.out.println (item.getPrice ());
       } catch (JAXBException e) {
           e.printStackTrace ();
       }
   }

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