我正在使用的平台 ：

• Fedora的20;
• mariadb-5.5.34-2.fc20.x86_64;
• 来自www.eclipse.org的Eclipse Kepler Service Release；
• Apache TomEE plus 1.6.0。

我正在执行示例

看这里

并且我正在尝试管理登录界面。我的问题是Login.xhtml的Java Bean尚未实例化。这怎么可能？我对Java
Bean非常熟悉，我检查了错误，该示例来自专业的Java程序员。我发现了这个麻烦，因为我没有设法进行登录，并且调试器未显示任何变量。

我附加了login.xhtml和Java Bean。我忽略了GUI库，因为我认为它们不是问题的一部分。

Login.xhtml

<ui:composition template="/templates/layout.xhtml"
     xmlns="http://www.w3.org/1999/xhtml"
     xmlns:f="http://java.sun.com/jsf/core"
     xmlns:h="http://java.sun.com/jsf/html"
     xmlns:ui="http://java.sun.com/jsf/facelets"
     xmlns:p="http://primefaces.org/ui"
>
     <ui:define name="content">
         <h:form styleClass="loginPanelStyle">
                 <p:growl id="msgs" showDetail="true" sticky="false" />                        
                <p:panelGrid columns="2">
                <f:facet name="header">
                    Login Panel
                </f:facet>
                <h:outputText value="Username : "></h:outputText>
                <p:inputText id="username" value="#{loginController.username}" required="true" requiredMessage="Please Enter Username!" message="fc">
                    <f:validateLength minimum="1" />  
                </p:inputText>
                <h:outputText value="Password : "></h:outputText>
                <p:password id="password" value="#{loginController.password}" required="true" requiredMessage="Please Enter password!">
                    <f:validateLength minimum="1" />  
                </p:password>
                <f:facet name="footer">
                <p:commandButton value="Submit" update="msgs" actionListener="#{loginController.login}" type="submit" icon="ui-icon-check" style="margin:0"></p:commandButton>
                </f:facet> 
            </p:panelGrid>
        </h:form>
     </ui:define>
</ui:composition>

LoginController.java

package controller;

import util.DateUtility;
import java.io.IOException;
import java.io.Serializable;
import java.security.Principal;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.enterprise.context.SessionScoped;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.inject.Inject;
import javax.inject.Named;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 * Login Controller class allows only authenticated users to log in to the web
 * application.
 *
 * @author Emre Simtay <emre@simtay.com>
 */
@Named
@SessionScoped
public class LoginController implements Serializable {

    @Inject
    private transient Logger logger;
    private String username;
    private String password;

    /**
     * Creates a new instance of LoginController
     */
    public LoginController() {
        System.out.println("che diamine");
    }

    //  Getters and Setters
    /**
     * @return username
     */
    public String getUsername() {
        return username;
    }

    /**
     *
     * @param username
     */
    public void setUsername(String username) {
        this.username = username;
    }

    /**
     *
     * @return password
     */
    public String getPassword() {
        return password;
    }

    /**
     *
     * @param password
     */
    public void setPassword(String password) {
        this.password = password;
    }

    /**
     * Listen for button clicks on the #{loginController.login} action,
     * validates the username and password entered by the user and navigates to
     * the appropriate page.
     *
     * @param actionEvent
     */
    public void login(ActionEvent actionEvent) {
        System.out.println("CONSOLE PRINT TEST");

        FacesContext context = FacesContext.getCurrentInstance();
        HttpServletRequest request = (HttpServletRequest) context.getExternalContext().getRequest();
        try {
            String navigateString = "";
            // Checks if username and password are valid if not throws a ServletException
            request.login(username, password);
            // gets the user principle and navigates to the appropriate page
            Principal principal = request.getUserPrincipal();
            if (request.isUserInRole("Administrator")) {
                navigateString = "/admin/AdminHome.xhtml";
            } else if (request.isUserInRole("Manager")) {
                navigateString = "/manager/ManagerHome.xhtml";
            } else if (request.isUserInRole("User")) {
                navigateString = "/user/UserHome.xhtml";
            }
            try {
                logger.log(Level.INFO, "User ({0}) loging in #" + DateUtility.getCurrentDateTime(), request.getUserPrincipal().getName());
                context.getExternalContext().redirect(request.getContextPath() + navigateString);
            } catch (IOException ex) {
                logger.log(Level.SEVERE, "IOException, Login Controller" + "Username : " + principal.getName(), ex);
                context.addMessage(null, new FacesMessage("Error!", "Exception occured"));
            }
        } catch (ServletException e) {
            logger.log(Level.SEVERE, e.toString());
            context.addMessage(null, new FacesMessage("Error!", "The username or password you provided does not match our records."));
        }
    }

    /**
     * Listen for logout button clicks on the #{loginController.logout} action
     * and navigates to login screen.
     */
    public void logout() {

        HttpSession session = (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false);
        HttpServletRequest request = (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
        logger.log(Level.INFO, "User ({0}) loging out #" + DateUtility.getCurrentDateTime(), request.getUserPrincipal().getName());
        if (session != null) {
            session.invalidate();
        }
        FacesContext.getCurrentInstance().getApplication().getNavigationHandler().handleNavigation(FacesContext.getCurrentInstance(), null, "/Login.xhtml?faces-redirect=true");
    }
}

TomEE控制台 ：

看这里

web.xml

看这里

文件夹树 ：

$ tree
.
├── build
│   └── classes
│       ├── controller
│       │   └── LoginController.class
│       ├── entity
│       │   ├── Address.class
│       │   ├── BaseEntity.class
│       │   ├── Role.class
│       │   └── User.class
│       ├── META-INF
│       │   └── persistence.xml
│       └── util
│           └── DateUtility.class
├── src
│   ├── controller
│   │   └── LoginController.java
│   ├── entity
│   │   ├── Address.java
│   │   ├── BaseEntity.java
│   │   ├── Role.java
│   │   └── User.java
│   ├── META-INF
│   │   └── persistence.xml
│   └── util
│       └── DateUtility.java
└── WebContent
    ├── admin
    │   ├── AdminHome.xhtml
    │   └── UserList.xhtml
    ├── ErrorAccessDenied.xhtml
    ├── Login.xhtml
    ├── manager
    │   └── ManagerHome.xhtml
    ├── META-INF
    │   └── MANIFEST.MF
    ├── resources
    │   ├── css
    │   │   └── default.css
    │   └── primefaces-nz
    │       ├── images
    │       │   ├── ui-bg_flat_30_cccccc_40x100.png
    │       │   ├── ui-bg_flat_50_5c5c5c_40x100.png
    │       │   ├── ui-bg_glass_40_ffc73d_1x400.png
    │       │   ├── ui-bg_highlight-hard_20_16475f_1x100.png
    │       │   ├── ui-bg_highlight-soft_33_1258bf_1x100.png
    │       │   ├── ui-bg_highlight-soft_35_222222_1x100.png
    │       │   ├── ui-bg_highlight-soft_44_444444_1x100.png
    │       │   ├── ui-bg_highlight-soft_80_1442c8_1x100.png
    │       │   ├── ui-bg_inset-hard_30_dedede_1x100.png
    │       │   ├── ui-icons_222222_256x240.png
    │       │   ├── ui-icons_292cd1_256x240.png
    │       │   ├── ui-icons_a83300_256x240.png
    │       │   ├── ui-icons_cccccc_256x240.png
    │       │   └── ui-icons_ffffff_256x240.png
    │       └── theme.css
    ├── templates
    │   ├── layout.xhtml
    │   └── tiles
    │       └── LeftMenu.xhtml
    ├── user
    │   └── UserHome.xhtml
    └── WEB-INF
        ├── faces-config.xml
        ├── lib
        └── web.xml

24 directories, 41 files