在類型java.lang.String中找不到屬性'productCategoryName'

我已經儘可能檢查了，但是我找不到問題所在，我已經看到了幾個與我的相關的堆棧溢出問題，但大多都是失蹤＃。和我已經看到的地方，舊版本的mojora lib可能會導致這種異常。我檢查了名稱，我在冬眠豆他們都看起來不錯，但無法找到問題.....在類型java.lang.String中找不到屬性'productCategoryName'

我的Html頁面：

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" 
    xmlns:h="http://java.sun.com/jsf/html" 
    xmlns:ui="http://java.sun.com/jsf/facelets" 
    xmlns:f="http://java.sun.com/jsf/core" 
    xmlns:p="http://primefaces.org/ui" 
    xmlns:t="http://myfaces.apache.org/tomahawk"> 

<h:body> 

    <ui:composition template="/WEB-INF/templates/layout.xhtml"> 
     <ui:param name="category" value="Admin" /> 
     <ui:param name="item" value="Create User" /> 
     <ui:param name="user" value="#{createUserAccountBean}" /> 
     <ui:define name="content"> 
     <h:form id="productsForm"> 
       <div class="headerbg"> 
        <div id="innerheaderbg"> 
         <div id="iconarea"> 
          <img src="#{request.contextPath}/images/headerimages/productlist.png" /> 
         </div> 
         <div id="headertextarea"> 
          <p class="headingtext">Order</p> 
          <p id="breadCrumbtext">Order &#160;<img src="#{request.contextPath}/images/error-bullet.gif" /> 
           &#160;Product Category List 
          </p> 
         </div> 
         <div id="otherarea"></div> 
        </div> 
       </div> 
      <p:growl /> 


      <div class="widget widget-table action-table"> 
       <div class="widget-header"> <i class="icon-th-list"></i> 
        <h3>Product List</h3> 
       <p:spacer width="10px" height="30px"/> 
       <h:outputLabel value="Product Category" style="color:#0A8FFF;font-weight:bold;margin-bottom:50px;"/> 
       <p:selectOneMenu value="#{productBean.productCategoryId}" id="pFilter" > 
         <f:selectItem itemLabel="--All--" itemValue="all" noSelectionOption="false"/> 
         <f:selectItems value="#{productCategoryBean.categoriesList}" var="category" 
               itemLabel="#{category.productCategoryName}" 
               itemValue="#{category.productCategoryId}" /> 
         <p:ajax update=":productsForm:productsTable" event="change" listener="#{productBean.filterProducts}" /> 
       </p:selectOneMenu> 
       </div> <!-- /widget-header --> 

       <div class="widget-content"> 

        <p:dataTable id="productsTable" value="#{productBean.products}" var="products" rowIndexVar="rowIndex" 
          paginator="true" rows="10" paginatorPosition="bottom" 
          paginatorTemplate="{FirstPageLink} {PreviousPageLink} {CurrentPageReport} {NextPageLink} {LastPageLink}" widgetVar="dt_products"> 
        <p:column headerText="S.No">#{rowIndex+1}</p:column> 
        <p:column headerText="Product Name">#{products.name}</p:column> 
        <p:column headerText="Product Code">#{products.code}</p:column> 
        <p:column headerText="Price">#{products.price}</p:column> 
        </p:dataTable> 


       </div> <!-- /widget-content --> 
      </div> 
      </h:form> 
      <br></br> 
     </ui:define> 
    </ui:composition> 
</h:body> 
</html>

，這裏是我的豆，ProductCategoryBean.java：

@Named(value = "productCategoryBean") 
    @Scope("session") 
    public class ProductCategoryBean 
    { 
     private java.util.List<ProductCategory> categoriesList; 

    public java.util.List<ProductCategory> getCategoriesList() 
    { 
     categoriesList.removeAll(Collections.singleton(null)); 
     return categoriesList; 
    } 

    public void setCategoriesList(java.util.List<ProductCategory> categoriesList) 
    { 
     this.categoriesList = categoriesList; 
    } 
    }

上午初始化類列表，而登錄在LoginBean.java

@Named(value = "loginBean") 
    @Scope("session") 
    public class LoginBean { 

     @Inject 
     private UserService userService; 

     @Inject 
     private StocktrackService stocktrackService; 

     @Inject 
     private MenuController menuController; 

     @Inject 
     private CheckOut checkOut; 


     @Inject 
     private ProductCategoryBean categoryBean; 

     @Inject 
     private ProductsBean productsBean; 


     private String userName; 
     private String password; 
     private String statusMessage; 

     HttpSession session = (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(true); 

     public String getUserName() { 
      return userName; 
     } 

     public void setUserName(String userName) { 
      this.userName = userName; 
     } 

     public String getPassword() { 
      return password; 
     } 

     public void setPassword(String password) { 
      this.password = password; 
     } 

     public String getStatusMessage() { 
      return statusMessage; 
     } 

     public void setStatusMessage(String statusMessage) { 
      this.statusMessage = statusMessage; 
     } 

     public String login() throws EncryptionException, ServiceException 
     { 
      StringEncrypter se = new StringEncrypter("DES"); 
      String encpassword = se.encrypt(getPassword()); 
      UserAccount userAccount = userService.validateLogin(userName, 
        encpassword); 
      if (userAccount == null) { 
       statusMessage = "The username or password is incorrect."; 
       return "login.xhtml"; 
      } 
      session.setAttribute("UserAccount", userAccount); 
      statusMessage = ""; 
      menuController.setTopmenu(menuLoader(userAccount)); 
       checkOut.setUserId(userAccount.getUserId()); 
       checkOut.setUsername(userAccount.getUserName()); 
       checkOut.setUserAccount(userAccount); 

      //setting category list of ProductCategoryBean 
      categoryBean.setCategoriesList(stocktrackService.getProductCategory()); 
      //setting product list of ProductListBean 
      productsBean.setProducts(stocktrackService.getProduct()); 

      return "/pages/leave/home.xhtml?faces-redirect=true"; 
     } 
     }

正在以下錯誤：

> Feb 09, 2015 1:04:54 PM 
> com.sun.faces.application.view.FaceletViewHandlingStrategy 
> handleRenderException SEVERE: Error Rendering 
> View[/pages/order/products.xhtml] javax.faces.FacesException: 
> javax.el.PropertyNotFoundException: /pages/order/products.xhtml @52,59 
> itemLabel="#{category.productCategoryName}": Property 
> 'productCategoryName' not found on type java.lang.String at 
> javax.faces.component.UIComponentBase$AttributesMap.get(UIComponentBase.java:2364) 
> at 
> org.primefaces.renderkit.InputRenderer.createSelectItem(InputRenderer.java:102) 
> at 
> org.primefaces.renderkit.InputRenderer.getSelectItems(InputRenderer.java:86) 
> at 
> org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeMarkup(SelectOneMenuRenderer.java:71) 
> at 
> org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeEnd(SelectOneMenuRenderer.java:65) 
> at 
> javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) 
> at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786) 
> at javax.faces.render.Renderer.encodeChildren(Renderer.java:168) at 
> javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845) 
> at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779) 
> at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) 
> at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) 
> at 
> com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:419) 
> at 
> com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125) 
> at 
> com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121) 
> at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)

來源

2015-02-09 kerZy Hart

的問題是，你已經在使用參數名稱category，它指的是String

<ui:param name="category" value="Admin" />

然後你被重用參數名稱f:selectItems,

<f:selectItems value="#{productCategoryBean.categoriesList}" var="category" 
     itemLabel="#{category.productCategoryName}" 
     itemValue="#{category.productCategoryId}" />

，但它已被定義爲ui:param您正在獲得給定的例外。爲了解決這個問題，只是用另一名稱爲var在f:selectItems：

<f:selectItems value="#{productCategoryBean.categoriesList}" var="productCategory" 
     itemLabel="#{productCategory.productCategoryName}" 
     itemValue="#{productCategory.productCategoryId}" />

來源

2015-02-09 10:25:06 user1983983

：太好了，其工作.could請你告訴我最好的做法，以避免和調試這種在網絡錯誤的applications.Normally你是什麼做調試這種情況。因爲代碼已經寫了一些，現在正在執行.....浪費了6個小時的兄弟.... – 2015-02-09 11:15:45

在類型java.lang.String中找不到屬性'productCategoryName'

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