Question

This is my XML file

   <BADFM>
<Given>
<Ord>
<Bag IDC="DM" />
</Ord>
</Given>
</BADFM>

This is my Parser class

import java.io.File;

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

public class Test {
    public static void main(String args[]) throws Exception {

        File file = new File("D:\\BADML.xml");
        JAXBContext jaxbContext = JAXBContext
                .newInstance(MyMessage.class);
        Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
        MyMessage authentifyResult = (MyMessage) jaxbUnmarshaller
                .unmarshal(file);
        System.out.println(authentifyResult.getGiven().getOrd().getBag().getIDC());

    }
}

This is MyMessage

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="BADFM")
public class MyMessage
{
@XmlElement(name="Given")
private Given given;

public Given getGiven() {
    return given;
}

public void setGiven(Given given) {
    this.given = given;
}


}

This is Given.java

import javax.xml.bind.annotation.XmlElement;

public class Given {
    private Ord ord;
    @XmlElement(name = "Ord")
    public Ord getOrd() {
        return ord;
    }
    public void setOrd(Ord ord) {
        this.ord = ord;
    }
}

This is Ord.java

 import javax.xml.bind.annotation.XmlElement;

public class Ord {

    private Bag bag;
    @XmlElement(name="Bag")
    public Bag getBag() {
        return bag;
    }

    public void setBag(Bag bag) {
        this.bag = bag;
    }

}

This is Bag.java

  import javax.xml.bind.annotation.XmlAttribute;

public class Bag {
      @XmlAttribute(name="IDC")
    private String IDC ;

    public String getIDC() {
        return IDC;
    }
    @XmlAttribute(name="IDC")
    public void setIDC(String IDC) {
        IDC = IDC;
    }

}

When i ran that i am getting

  Exception in thread "main" com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
Class has two properties of the same name "IDC"
    this problem is related to the following location:
        at public java.lang.String Bag.getIDC()
        at Bag
        at public Bag Ord.getBag()
        at Ord
        at public Ord Given.getOrd()
        at Given
        at public Given MyMessage.getGiven()
        at MyMessage
    this problem is related to the following location:
        at private java.lang.String Bag.IDC
        at Bag
        at public Bag Ord.getBag()
        at Ord
        at public Ord Given.getOrd()
        at Given
        at public Given MyMessage.getGiven()
        at MyMessage

    at com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException$Builder.check(Unknown Source)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(Unknown Source)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(Unknown Source)
    at com.sun.xml.internal.bind.v2.ContextFactory.createContext(Unknown Source)
    at com.sun.xml.internal.bind.v2.ContextFactory.createContext(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
    at javax.xml.bind.ContextFinder.find(Unknown Source)
    at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
    at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
    at Test.main(Test.java:11)

Answer 1

You need to use the @XmlAttribute for the IDC variable of the Bag class. Once you make that change, the XML you referenced at the top will work.

As for your current code, it is expecting the XML to look like:

<Bag>
  <IDC>DM</IDC>
</Bag>

You can easily see what type of XML your classes are expecting by populating all attribute fields and then marshaling the object to a file.

Update

You should always declare your attributes as private if you are going to have properly named getters and setters. Otherwise, JAXB will throw the error Class has two properties of the same name.

When declaring that a class attribute is a @XmlAttribute, you should also put the annotation on the getter so that JAXB does not think you want both a @XmlAttribute and @XmlElement with the same name.

public class Bag {
    private String IDC ;

    @XmlAttribute(name="IDC")
    public String getIDC() {
        return IDC;
    }

    public void setIDC(String IDC) {
        this.IDC = IDC;
    }
}