我正在使用的平台:
- 软呢帽 20；
- mariadb-5.5.34-2.fc20.x86_64;
- 来自 www.eclipse.org 的 Eclipse Kepler 服务版本；
- Apache TomEE 加 1.6.0。
我正在实现示例
我正在尝试管理登录界面。我的问题是Login.xhtml 的Java Bean 没有被实例化。这怎么可能？我对 Java Beans 非常熟悉，我检查了错误，示例来自专家 Java 程序员。 我发现这个问题是因为我没有成功登录，而且调试器没有显示任何变量。 Eclipse: no shown variables in debugging Java EE
我附加了 login.xhtml 和 Java bean。我省略了 GUI 库，因为我认为它们不是问题的一部分。
登录.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:
web.xml
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
最佳答案
你的 web.xml 是什么？您是否将 jsf 页面映射到 *.html 或 *.jsf 或其他？
如果你希望使用CDI，你是否在WEB-INF中有一个beans.xml？
关于jsf - Bean 未实例化，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21017979/