jsf 2.3 核心标签显示“没有名称空间的库”

Question

I am using netbeans for java web project ( included JSF 2.3, primefaces 5.0 ). index.xhtml 工作正常，但是当我创建单选按钮时，我无法使用（f：selectItem）（它没有显示 xmlns:f=" http://xmlns.jcp.org/jsf/core的库" )。 我还附上了所附库的屏幕截图）。 以下是我使用的代码：

'''

<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:h="http://xmlns.jcp.org/jsf/html"
  xmlns:f=" http://xmlns.jcp.org/jsf/core"
  xmlns:p="http://primefaces.org/ui">
<h:head>
    <title>Employee Details</title>
    <link href="css/mycss.css" rel="stylesheet" type="text/css"/>
</h:head>
<h:body>

    <div class="employeeform"> 
        <h2> Employee Entry Detail Form</h2>

        <h:form id="form">  
            <table>  
                <tr>  
                    <td><h:outputLabel for="username">User Name</h:outputLabel></td>  
                    <td><h:inputText id="name-id" value="#{user.name}" validatorMessage="User name is required"/></td>  
                </tr>  
                <tr>  
                    <td><h:outputLabel for="email">Your Email</h:outputLabel></td>  
                    <td><h:inputText id="email-id" value="#{user.email}" validatorMessage="User email is required"/></td>  
                </tr>  
                <tr>  
                    <td><h:outputLabel for="password">Password</h:outputLabel></td>  
                    <td><h:inputSecret id="password-id" value="#{user.password}" validatorMessage="User password is required"/></td>  
                </tr>  

                <tr>  
                    <td><h:outputLabel for="gender">Gender</h:outputLabel></td>  
                    <tr>  
                        <td><h:outputLabel for="gender">Gender</h:outputLabel></td>  
                        <td> <p:selectOneRadio id="console" value="#{radioView.console}" unselectable="true">
                                <f:selectItem itemLabel="Option1" itemValue="Option1"/>
                                <f:selectItem itemLabel="Option2" itemValue="Option2"/>

                            </p:selectOneRadio>
                    </tr>  
                </tr>  
                <tr><td><h:outputLabel for="address">Complete Address</h:outputLabel></td>  
                    <td><h:inputTextarea value="#{user.address}" cols="50" rows="5"/></td></tr>  
            </table>  
            <h:commandButton value="Submit" action="response.xhtml"></h:commandButton>  
        </h:form> 
    </div>
</h:body>

'''

请帮我解决这个问题。 在此处输入图像描述