ID必須存在於容器或作爲生成列，缺少ID：ID

Question

爲什麼我得到這個錯誤，我已經嘗試了所有的命名規則（小寫/大寫）

我使用Vaadin任何想法，這裏是我的代碼片段：

public class Usercontainer extends BeanItemContainer<Users> implements Serializable{ 
    public static final Object[] NATURAL_COL_ORDER = new Object[] {"id", "empCode"}; 

    public static final String[] COL_HEADERS_ENGLISH = new String[] {"User Id", "Emp code"}; 

    public Usercontainer() throws IllegalArgumentException { 
     super(Users.class); 
    } 

    public static Usercontainer createTestData(){ 
     Usercontainer users = null;  
     try 
     { 
      users = new Usercontainer(); 
      for(int i=0; i<10;i++){ 
       Users user = new Users(); 
       user.setId(i*10); 
       user.setEmpcode("C00"+i); 
       users.addItem(user); 
      } 
     } 
     catch(Exception e){System.out.println("Error :"+e.getMessage());}  
     return users;  
    } 
} 

---

@Entity 
@Table(name="_user") 
public class Users { 
    //private String name; 
    public int id; 
    public String empcode; 

     @Id 
    public int getId() { 
     return id; 
    } 

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


    public String getEmpcode() { 
     return empcode; 
    } 
    public void setEmpcode(String empcode) { 
     this.empcode = empcode; 
    } 


} 

---

public class UserTable extends Table { 


    public UserTable(App1Application app){ 
     setSizeFull(); 
     setContainerDataSource(app.getDataSource()); 
     setVisibleColumns(Usercontainer.NATURAL_COL_ORDER); 
     setColumnHeaders(Usercontainer.COL_HEADERS_ENGLISH); 
     this.setColumnReorderingAllowed(true); 
     setSelectable(true); 
     setImmediate(true); 
     addListener((Property.ValueChangeListener)app); 
     setNullSelectionAllowed(false); 


    } 
} 

Answer 1

如果您在NATURAL_COL_ORDER中使用"empCode"，則應在實體類（而不是getEmpcode()）中使用getEmpCode() getter方法。