Question

我尽可能多地检查，但我找不到问题所在，我看到很少有与我相关的堆栈溢出问题，但大多数似乎都缺少＃。我已经看到某个地方老版本的mojora lib可能会导致这种例外。我检查了我在hibernate bean中使用的名称它们看起来都很好但是我找不到问题.....

我的Html页面：

    <?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>

这是我的bean，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;
    }
    }

在LoginBean.java登录时初始化类别列表

    @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";
        }
         }

我收到以下错误：

> 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)

Answer 1

问题是您已使用参数名称category并且它引用了String

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

然后您在f:selectItems，

中重复使用参数名称

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

但由于它已被定义为ui:param，因此您将获得给定的异常。要解决此问题，请在var中使用f:selectItems的其他名称：

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

在类型java.lang.String上找不到属性'productCategoryName'

1 个答案: