@RequestMapping(value = "/admin/control", method = RequestMethod.POST)
public String getListUser(Model model) {
    model.addAttribute("user", new User());
    model.addAttribute("listUser", userService.getListUser());

    return "control";
}

@RequestMapping(value = "admin/control/remove/{id}")
public String removeUser(@PathVariable("id") Integer id) {
    userService.removeUser(id);

    return "redirect:/admin/control";
}

@Override
public List<User> getListUser() { return userDao.findAll(); }

@Override
public void removeUser(Integer id) {
    userDao.delete(id);
}

<c:if test="${!empty listUser}">

        <div id="table-student">

            <table class="table table-striped">
                <tr class="tr">
                    <td width="40">ID</td>
                    <td width="100">Имя</td>
                    <td width="100">Группа</td>
                    <td width="60">Удалить</td>
                </tr>

                <c:forEach items="${listUser}" var="user">
                    <tr>
                        <td>${user.id}</td>
                        <td>${user.username}</td>
                        <td>
                            <c:if test="${user.groupId eq 1}">ПО521</c:if>
                            <c:if test="${user.groupId eq 2}">ПО411</c:if>
                            <c:if test="${user.groupId eq 3}">ТЭ521</c:if>
                            <c:if test="${user.groupId eq 4}">ТЭ411</c:if>
                        </td>
                        <td><a href="<c:url value='/admin/control/remove/${user.id}'/>">Удалить</a></td>
                    </tr>
                </c:forEach>
            </table>

        </div>

    </c:if>