麻烦大家帮我看看问题出在哪里

public class UpdateAction extends DispatchAction {

private UserServiceInter userService;

public void setUserService(UserServiceInter userService) {
    this.userService = userService;
}

//修改信息，真正添加到数据库 updateInfo
public ActionForward updateInfo(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {

    //将字符串转化为日期类型
    DateFormat format = new SimpleDateFormat("yyyy-MM-dd");

    //得到当前用户[从session取出]
    Users loginUser = (Users) request.getSession().getAttribute("loginuser");

    //从表单中获取修改个人的信息(birth,tel,website,msn,book,movie,music,sport,cartoon)
    UserForm userForm = (UserForm)form;

    try{
       loginUser.setBirth(format.parse(userForm.getBirth()));
    }catch(ParseException e){
        e.printStackTrace();
    }
    //System.out.println(userForm.getBirth());
    //System.out.println(loginUser.getBirth());
    loginUser.setTel(userForm.getTel());
    loginUser.setWebsite(userForm.getWebsite());
    loginUser.setMsn(userForm.getMsn());
    loginUser.setBook(userForm.getBook());
    loginUser.setMovie(userForm.getMovie());
    loginUser.setMusic(userForm.getMusic());
    loginUser.setSport(userForm.getSport());
    loginUser.setCartoon(userForm.getCartoon());

    //保存用户
    userService.save(loginUser);

    return mapping.findForward("goHomePageUI");
}

}
异常信息如下：
javax.servlet.ServletException: org.springframework.dao.DataIntegrityViolationException: Could not execute JDBC batch update; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update

指示是userService.save(loginUser);这行代码有问题。求指教

其中有一个字段不允许为空，需要给它赋值就可以了
2.DataIntegrityViolationException
not-null
你把数据库中的属性全都改为允许为空！解决问题！
非空属性引用了一个空的或者瞬时(游离状态)的值，可能是引用的值还没有进行持久化吧，还处于游离状态

看看这张表的hibernate配置，主键是否正确，是否可能会重复