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JAXB Child only parsing issue

 
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I am parsing a very big file using JAXB and trying to avoid unnecessary tags which I dont need, I am trying to just parse some of the grandChildren of the root element, and providing only those classes while creating JAXBContext. When I provide the grandChild class in classes to bound It throws exception, however If I provide the root class in the classes to bound it works.
so
if I provide this
JAXBContext context = JAXBContext.newInstance(new Class[] {com.parent.class});
It works fine.

but when I try this.
JAXBContext context = JAXBContext.newInstance(new Class[] {com.parent.child.grandChild.class});

It throws following exception

javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"grandChild"). Expected elements are (none)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:648)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:236)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:231)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Loader.java:105)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(UnmarshallingContext.java:1051)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:484)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:465)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.InterningXmlVisitor.startElement(InterningXmlVisitor.java:60)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:135)

I have generated all classes with XJC. I do have the ObjectFactory in the same place as I have my generated class.
ANy clue, what is going wrong here?
 
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