Spring java.lang.IllegalArgumentException:尝试创建具有空实体的事件

我尝试持久化此实体：

@Entity
public class Cliente extends Model {
  @Id
  @GeneratedValue(strategy=GenerationType.IDENTITY)
  private Integer id;

  @OneToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
  private Usuario usuario;

  @OneToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
  private org.loja.model.cesta.Cesta cesta;

  @OneToMany(fetch = FetchType.EAGER, cascade=CascadeType.ALL)
  @OrderColumn
  private List<org.loja.model.pedido.Pedido> pedidos;

  public Cliente() {
    this.usuario = new Usuario();
    this.cesta = null;
    this.pedidos = null;
  }
}

当我尝试提交数据时

我的控制器：

@RequestMapping(value = "/register", method=RequestMethod.GET)
public String formRegister(Model model) {
  model.addAttribute("command", new Cliente());
  return "register";
}

@RequestMapping(value = "/register", method=RequestMethod.POST)
@ResponseBody
public void doRegister(@ModelAttribute("cliente") Cliente object) throws Exception {
  home.register(object);
}

---

任何人都可以提示这里出了什么问题？

错误表明传递给saveorUpdate的对象是nul，您是否在rest调用中验证了该对象不为空？我在浏览器开发人员工具的tab network中检查，所有参数都在那里。在控制器中，当我尝试打印对象时，对象为空。

<form class="form-signin" id="form" method="post" th:object="${command}" th:action="@{/register}">
    <label for="username" class="sr-only">Username</label>
    <input type="text" th:field="*{usuario.username}" id="username" class="form-control" placeholder="Username" required autofocus>

    <label for="password" class="sr-only">Password</label>
    <input type="password" th:field="*{usuario.password}" id="password" class="form-control" placeholder="Password" required>

    <label for="firstName" class="sr-only">Nome</label>
    <input type="text" th:field="*{usuario.firstName}" id="firstName" class="form-control" placeholder="Nome" required>

    <label for="lastName" class="sr-only">Sobrenome</label>
    <input type="text" th:field="*{usuario.lastName}" id="lastName" class="form-control" placeholder="Sobrenome" required>

    <label for="email" class="sr-only">E-mail</label>
    <input type="email" th:field="*{usuario.email}" id="email" class="form-control" placeholder="E-mail" required>
</form>

java.lang.IllegalArgumentException: attempt to create event with null entity

@RequestMapping(value = "/register", method=RequestMethod.GET)
public String formRegister(Model model) {
  model.addAttribute("command", new Cliente());
  return "register";
}

@RequestMapping(value = "/register", method=RequestMethod.POST)
@ResponseBody
public void doRegister(@ModelAttribute("cliente") Cliente object) throws Exception {
  home.register(object);
}