JSF教程在eclipse和Wildfly中不起作用[重复]答案

【问题标题】：JSF Tutorial not working in eclipse and Wildfly [duplicate]JSF教程在eclipse和Wildfly中不起作用[重复]
【发布时间】：2021-12-31 00:51:02
【问题描述】：

我正在尝试在 Windows 10 上使用 Wildfly (25.0.0.Final) 在 eclipse (2021-09) 中运行 Maven Hello World 教程。我已包含以下文件： pom.xml、web.xml、index.xhtml 和 HelloWorldBacking.java。

在项目方面，我选择了：

动态 Web 模块 4.0
Java 15
JavaScript 1.0
JavaServer Faces 2.3

项目在服务器上运行时，我输入一个名称点击提交，出现如下错误： javax.servlet.ServletException: /index.xhtml @15,63 value="#{helloWorldBacking.name}": 目标无法到达，标识符 'helloWorldBacking' 解析为 null 在 javax.faces.api@3.0.0.SP04//javax.faces.webapp.FacesServlet.executeLifecyle(FacesServlet.java:725)

不知道为什么会发生这种情况。非常感谢任何帮助。

POM.XML

`<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
        http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>ca.ssi</groupId>
  <artifactId>hello-world-jsf-23</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>hello-world-jsf-23 Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>15</maven.compiler.source>
    <maven.compiler.target>15</maven.compiler.target>
    <failOnMissingWebXml>false</failOnMissingWebXml>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-api</artifactId>
        <version>8.0</version>
        <scope>provided</scope>
    </dependency>
  </dependencies>

  <build>
    <finalName>hello-world-jsf</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

WEB.XML

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="4.0" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd">

    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>
    
    <welcome-file-list>
        <welcome-file>index.xhtml</welcome-file>
    </welcome-file-list>
</web-app>

索引.XHTML

<!DOCTYPE html>
<html lang="en"
      xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://xmlns.jcp.org/jsf/html"
      xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
      xmlns:f="http://xmlns.jcp.org/jsf/core">

<h:head>
    <title>Hello World JSF 2.3</title>
</h:head>
<h:body>

    <h:form>
        <h:outputLabel for="input" value="Who do you want to greet?" />
        <h:inputText id="input" value="#{helloWorldBacking.name}" />
        <h:commandButton value="Submit" 
                         action="#{helloWorldBacking.greetPerson}" >
        </h:commandButton>
        <br/>
        <h:outputText value="#{helloWorldBacking.greet}" />
    </h:form>
    
</h:body>   
</html>`

HelloWorldBacking.java

`package ca.ssi;

import javax.enterprise.context.RequestScoped;
import javax.inject.Named;

@Named
@RequestScoped
public class HelloWorldBacking {
    
    private String name;
    private String greet;
    
    public void greetPerson() {
        this.greet = "Hello World: " + this.name + "!";
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGreet() {
        return greet;
    }

    public void setGreet(String greet) {
        this.greet = greet;
    }

}
`

【问题讨论】：

标签： eclipse jsf wildfly

【解决方案1】：

使用此内容添加WEB-INF/beans.xml 文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/beans_2_0.xsd"
       bean-discovery-mode="all">
</beans>

【讨论】：

谢谢，这就是缺少的。