[Solved] JAXB UnmarshalException: unexpected element

javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"employee"). Expected elements are (none)
	at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:726)
	at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:247)
	at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:242)
	at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Loader.java:109)

public class Employee implements Serializable {

	private static final long serialVersionUID = 1L;

	private Integer id;
	private String firstName;
	private String lastName;
	private Department department;

	//constructors, getters and setters

	@Override
	public String toString() {
		return "Employee [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", department="
				+ department + "]";
	}
}

/**
  * Unmarshal XML data from the specified XML Source by <tt>declaredType</tt> and return the
  * resulting content tree.
  * @param  source       source the XML Source to unmarshal XML data from (providers are
  *               only required to support SAXSource, DOMSource, and StreamSource)
  *
  * @param  declaredType  appropriate JAXB mapped class to hold <tt>source</tt>'s xml root element
  * 
  * @return value        Java content rooted by JAXB Element
  */
public <T> JAXBElement<T> unmarshal( javax.xml.transform.Source source, Class<T> declaredType )
        throws JAXBException;

JAXBElement<Employee> jaxbElement = (JAXBElement<Employee>) jaxbUnmarshaller
          .unmarshal(new StreamSource(xmlFile), Employee.class);

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<employee>
    <department>
        <id>101</id>
        <name>IT</name>
    </department>
    <firstName>Lokesh</firstName>
    <id>1</id>
    <lastName>Gupta</lastName>
</employee>

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 javax.xml.transform.stream.StreamSource;
 
import com.howtodoinjava.demo.model.Employee;
 
public class JaxbExample 
{
  public static void main(String[] args) 
  {
    String fileName = "employee.xml";
 
    jaxbXmlFileToObject(fileName);
  }
 
  private static void jaxbXmlFileToObject(String fileName) 
  {
    File xmlFile = new File(fileName);
    JAXBContext jaxbContext;
    try
    {
      jaxbContext = JAXBContext.newInstance(Employee.class);
      Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
       
      JAXBElement<Employee> jaxbElement = (JAXBElement<Employee>) jaxbUnmarshaller
          .unmarshal(new StreamSource(xmlFile), Employee.class);
       
      Employee employee = jaxbElement.getValue();
       
      System.out.println(employee);
    }
    catch (JAXBException e) 
    {
      e.printStackTrace();
    }
  }
}

Employee [id=1, firstName=Lokesh, lastName=Gupta, department=Department [id=101, name=IT]]