Spring MVC表單 - 長和字符串值。通過客戶端發送的請求是語法不正確

Question

簡單的例子，檢查

實體（USER，MOBILEPHONE）

@Entity 
@Table(name = "USER") 
public class User { 

private Long id 
private String name; 
private Set<Mobilephone> mobilephones= new HashSet<mobilephones>(0); 

public User(Long id) 
this.id = id 
} 

@Id 
@GeneratedValue(strategy = GenerationType.IDENTITY) 
public Long getId() { 
    return this.id; 
} 

public void setId(long id) { 
    this.id = id; 
} 

//getter and setter for name 

@OneToMany(fetch = FetchType.LAZY, mappedBy = "user") 
public Set<Mobilephone> getMobilephones() { 
    return this.mobilephones; 
} 

public void setMobilephones(Set<Mobilephone> mobilephones) { 
    this.mobilephones= mobilephones; 
} 

@Entity 
@Table(name = "MOBILEPHONE") 
public class Mobilephone { 

private Long id 
private Long number; 
private User user 

public MobilePhone(Long id) 
this.id = id 
} 

@Id 
@GeneratedValue(strategy = GenerationType.IDENTITY) 
public Long getId() { 
    return this.id; 
} 

public void setId(Long id) { 
    this.id = id; 
} 

//getter and setter for number 

@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "USERID", nullable = false) 
public User getUser() { 
    return this.user; 
} 

public void setUser(User user) { 
    this.user= user; 
} 

頁面

<form:form modelAttribute="mobilephoneAttribute" action="url" method="post"> 
    <form:input path="mobilephone"/> 
    <form:select path="user"> 
     <c:forEach items="${userlist}" var="user"> 
      <form:option value="${user.id}" label="${user.telephone" /> 
     </c:forEach> 
    </form:select> 
    <input type="submit"/> 
</form:form> 

請告訴我發生的事情。

後提交我得到這個錯誤：

The request sent by the client was syntactically incorrect. 

如果我改變我的用戶：「龍號」到「串號」（也是方法）的問題消失。

我認爲在一開始，春天有一個問題，轉換爲長的字符串？ 但是可能不會，因爲我們有一個數字，Long保存沒有問題。

有人知道這個問題嗎？

Answer 1

嘗試使用

<form:select path="user.id"> 
     <c:forEach items="${userlist}" var="user"> 
      <form:option value="${user.id}" label="${user.telephone" /> 
     </c:forEach> 
    </form:select>