Сохранение Vector<> в .xml - Java SE - Ответ 6809568

@XmlType(propOrder = { "name", "group", "date" }, name = "student")
public class Student 
{
    private String name;
    private int group;
    private String date;
    
    public Student(){}
    
    @XmlElement
    public boolean setName(String name){
    ...}
    
    @XmlAttribute
    public boolean setGroup(int group){
    ...}
    
    public boolean setDate(String date){
    ...}
    
    public String getName(){
    ...}
    
    public int getGroup(){
    ...}
    
    public String getDate(){
    ...}
}

@XmlType(propOrder = { "department", "index", "students" }, name = "group")
@XmlRootElement
public class Group 
{
    private int index;
    private String department;
    
    @XmlElementWrapper
    @XmlElement(name="List of Students")
    private Vector<Student> students;
 
    public Group()
    {
        students = new Vector<Student>();
    }
    
    еще методы()......
}

@XmlRootElement
public class Cache 
{
    private Vector<Group> groups;
    private Vector<Student> students;
    
    public Cache() 
    {
        groups = new Vector<Group>();
        students = new Vector<Student>();
    }
    
    //@XmlElementWrapper
    //@XmlElement(name="List of Groups")
    public boolean setAllGroups(Vector<Group> groups)
    {
        this.groups = groups;
        return true;
    }
    
    //@XmlElementWrapper
    //@XmlElement(name="List of Students")
    public boolean setAllStudent(Vector<Student> students)
    {
        this.students = students;
        return true;
    }
}

public class Store 
{
    public Store(){}
    
    
    public void createXML(Vector<Group> groups, Vector<Student> students) 
    {
        try 
        {
            File file = new File("jaxb.xml");
            JAXBContext c = JAXBContext.newInstance(Group.class);
            Marshaller jaxbmarchaller = c.createMarshaller();
            
            jaxbmarchaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
             
            jaxbmarchaller.marshal(groups, file);//в файл
            jaxbmarchaller.marshal(groups, System.out);//в коммандную строку
            
        } 
        catch (JAXBException e) 
        {
            e.printStackTrace();
        }
    }
}