annotate java class manually to map between xml and object

package upmover.schema.model;

import java.io.StringReader;
import java.io.StringWriter;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import javax.xml.bind.annotation.XmlValue;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;



@XmlRootElement(name="root")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "TestModel")
public class TestModel {

	@XmlValue
	private String msg;
	public void setMsg(String msg) {
		this.msg=msg;
	}
	
	public String getMsg() {
		return msg;
	}
	
	public static void main(String[] args) throws Exception {
			unmarshal();
	}
	
	//marshal -- from java object to xml
	public void marchal() throws Exception {
		JAXBContext JContext=JAXBContext.newInstance(TestModel.class.getPackage().getName());

		TestModel helloT=new TestModel();
		helloT.setMsg("Define a model");
		Marshaller m=JContext.createMarshaller();
		m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
		StringWriter writer=new StringWriter();
		m.marshal(helloT, writer);
		String outputXml=writer.toString();
		System.out.println("xml output:\n"+outputXml);
		//output: <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
		//        <root>Define a model</root>
	}
	
	//unmarshal -- from xml to java object
	public static void unmarshal() throws Exception {
		JAXBContext JContext=JAXBContext.newInstance(TestModel.class.getPackage().getName());

		Unmarshaller um=JContext.createUnmarshaller();
		
		XMLInputFactory f = XMLInputFactory.newInstance();
		String xml="<root>the content</root>";
		XMLStreamReader in=f.createXMLStreamReader(new StringReader(xml));
		
		JAXBElement<TestModel> jaxbElement=um.unmarshal(in, TestModel.class);
		
		TestModel h=jaxbElement.getValue();
		System.out.println(" HelloType.getMsg(): "+h.getMsg());
	}
	
}

package upmover.schema.model;





import javax.xml.bind.annotation.XmlRegistry;

@XmlRegistry
public class ObjectFactory {

   
	
    public TestModel createHelloType() {
        return new TestModel();
    }
    
}