我在springboot2中有一个带有jsp的简单java应用程序。我使用h2数据库来测试数据。它工作正常，但是jsp不呈现来自控制器的列表数据。jsp中的列表是空的，而在控制器中它有2个值。其他属性（如string）工作正常。我不明白问题出在哪里。
控制器：

@Controller
public class HomeController {

@Autowired
UserService userService;

@GetMapping("/users")
public String getUsers(ModelMap map) {
    this.userService.getAll().forEach(user -> System.out.println("user: " + user));
    map.addAttribute("users", this.userService.getAll());
    return "/users";
}
}

用户模型：

@NoArgsConstructor
@Getter
@Setter
@EqualsAndHashCode
@ToString
@Entity
public class User implements Serializable {

    @Id
    @GeneratedValue
    private Long id;
    private String firstName;
    private String lastName;
    private String country;

    public User(@JsonProperty Long id, @JsonProperty String firstName, @JsonProperty String lastName, @JsonProperty String country) {
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.country = country;
    }
}

jsp页面：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
    <jsp:include page="header.jsp">
        <jsp:param name="title" value="LIBRARY - Users"/>
    </jsp:include>
        <!--NAVBAR-->
        <%@ include file="navbar.jsp"%>
        <!--CONTENT-->
        <div class="container-fluid h-100">        
            <table class="table table-hover">
                <thead>
                    <tr>
                        <th>Index</th>
                        <th>Id</th>
                        <th>First Name</th>
                        <th>Last Name</th>
                        <th>Country</th>
                    </tr>
                </thead>
                <tbody>
                    <c:forEach items="${users}" var="user" varStatus="iteration">
                        <tr>
                            <td>${iteration.index}</td>
                            <td>${user.id}</td>
                            <td>${user.firstName}</td>
                            <td>${user.lastName}</td>
                            <td>${user.country}</td>
                        </tr>
                    </c:forEach>
                </tbody>
            </table>
            <c:if test="${empty users}">
                <div class="d-flex justify-content-center">
                    <p>There are no records in the database</p>
                </div>            
            </c:if>
        </div>    
    <jsp:include page="footer.jsp" />

从控制器调试：

user: User(id=111111, firstName=Wick, lastName=England, country=John)
user: User(id=111112, firstName=Madman, lastName=USA, country=Andy)

cls从h2返回list，它在调试中，看起来很好。

@Transactional
public List<User> getAll() {
    return (List<User>) this.userRepository.findAll();
}

截图：

有什么问题吗？