Java JAXB Unmarshaller convert xml to Java Object

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

public class Main {
    public void run(String xmlFile, String context) throws JAXBException, FileNotFoundException {
        JAXBContext jc = JAXBContext.newInstance(context);
        Unmarshaller u = jc.createUnmarshaller();
    //from   ww w . ja va  2  s.c om
        FileInputStream fis = new FileInputStream(xmlFile);
        Languages languages = (Languages)u.unmarshal(fis);
        for (Language p: languages.getLanguage()) {
            System.out.printf("ID: %s\n", p.getId());
            System.out.printf("NAME: %s\n", p.getName());
            System.out.printf("DIAGNOSIS: %s\n\n", p.getFeature());
        }
    }
    
    public static void main(String[] args) {
        if (args.length != 2 ) {
            System.out.printf("Usage: java Main <xmlfile> <context>\n");
            System.exit(1);
        }
        UnmarshalLanguages app = new UnmarshalLanguages();
        try {
            app.run(args[0], args[1]);
        } catch (JAXBException ex) {
            ex.printStackTrace();
        } catch (FileNotFoundException ex) {
            ex.printStackTrace();
        }
    }
}

import java.math.BigInteger;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlType;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "Language", propOrder = {
    "name",/*from   ww w  .j  a va  2  s . c om*/
    "feature"
})
public class Language {

    @XmlElement(required = true)
    protected String name;
    @XmlElement(required = true)
    protected String feature;
    @XmlAttribute(name = "id", required = true)
    protected BigInteger id;
    public String getName() {
        return name;
    }
    public void setName(String value) {
        this.name = value;
    }
    public String getFeature() {
        return feature;
    }
    public void setFeature(String value) {
        this.feature = value;
    }
    public BigInteger getId() {
        return id;
    }
    public void setId(BigInteger value) {
        this.id = value;
    }

}

import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "language"//from  w  w w.  j  a va  2 s .c  o  m
})
@XmlRootElement(name = "languages")
public class Languages {

    @XmlElement(required = true)
    protected List<Language> language;

    public List<Language> getLanguage() {
        if (language == null) {
            language = new ArrayList<Language>();
        }
        return this.language;
    }

}

import javax.xml.bind.annotation.XmlRegistry;
@XmlRegistry/*from   w ww.j  a  v  a2  s. c  om*/
public class ObjectFactory {
    public ObjectFactory() {
    }
    public Languages createLanguages() {
        return new Languages();
    }
    public Language createLanguage() {
        return new Language();
    }

}