Question

我想使用mvn tomcat:run在tomcat上部署我的JSF2应用程序。我之前使用mvn clean install命令正确编译了它。 Tomcat对我说INFO: Starting Coyote HTTP/1.1 on http-8080

我想知道我是否正确配置了欢迎页面。这是我的 web.xml ：

 <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">

    <display-name>Archetype Created Web Application</display-name>

    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>

    <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>home.xhtml</welcome-file>
    </welcome-file-list>


</web-app>

这是我的 pom.xml ，只是为了仔细检查artifactid是否正确：

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.bogus</groupId>
    <artifactId>jsf2_tutorial</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>jsf2_tutorial Maven Webapp</name>
    <url>http://maven.apache.org</url>

    <repositories>
        <repository>
            <id>maven2-repository.dev.java.net</id>
            <name>Java.net Repository for Maven</name>
            <url>http://download.java.net/maven/2</url>
        </repository>
    </repositories>

    <dependencies>

        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-api</artifactId>
            <version>2.1.0-b03</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-impl</artifactId>
            <version>2.1.0-b03</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

我将要粘贴最后一位， home.xhtml ，以确保它也是正确的：

<!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:ui="http://java.sun.com/jsf/facelets"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html">
    <h:head>
        <title>Hello JSF 2!</title>
    </h:head>
    <h:body>
       #{welcome.message}
    </h:body>
</html>

导航到欢迎页面时的错误是：

HTTP status 500
In the url I notice I had a typo. Now I enter the correct URL but the problem is:

    type Exception report

    message

    description The server encountered an internal error () that prevented it from fulfilling this request.

    exception

javax.servlet.ServletException: Class javax.faces.webapp.FacesServlet is not a Servlet
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Thread.java:662)

root cause

java.lang.ClassCastException: javax.faces.webapp.FacesServlet cannot be cast to javax.servlet.Servlet
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Thread.java:662)

    note The full stack trace of the root cause is available in the Apache Tomcat/6.0.29 logs.

更新

我通过从pom.xml

中删除servlet-api依赖来消除异常

 <dependency>  <groupId>javax.servlet</groupId> 
 <artifactId>servlet-api</artifactId>  <version>2.5</version> 
 </dependency>

现在加载页面但未显示消息。这就是这个应用程序的java部分的样子：

package org.bogus;
import javax.faces.bean.ManagedBean;

@ManagedBean(name = "welcome", eager = true)
public class WelcomeBean {
    public WelcomeBean() {
        System.out.println("WelcomeBean instantiated");
    }
    public String getMessage() {
        return "I'm alive!";
    }
}

此示例与oracle上的官方JSF教程几乎相同：http://docs.oracle.com/javaee/6/tutorial/doc/gjaam.html

我添加了<load-on-startup>1</load-on-startup>，但我仍未在控制台或页面中看到该消息。也许配置仍有问题。有什么想法吗？

更新我刚刚将faces-config.xml文件包含在WEB-INF下，但仍无效：

<?xml version="1.0" encoding="UTF-8"?>
<!-- This file is not required if you don't need any extra configuration. -->
<faces-config version="2.1"
   xmlns="http://java.sun.com/xml/ns/javaee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="
      http://java.sun.com/xml/ns/javaee
      http://java.sun.com/xml/ns/javaee/web-facesconfig_2_1.xsd">

   <!-- Write your navigation rules here. -->

   <application>
        <locale-config>
            <default-locale>en</default-locale>
            <supported-locale>en</supported-locale>
        </locale-config>
   </application>

</faces-config>

Answer 1

你基本上有两个问题：

JSF2至少需要Servlet 2.5（Tomcat 6兼容），但您的web.xml声明符合Servlet 2.3（Tomcat 4兼容）。您应该将web.xml声明为与servletcontainer兼容的最高版本。鉴于它是Tomcat 6，它是一个Servlet 2.5容器，请将其声明为Servlet 2.5。

<?xml version="1.0" encoding="UTF-8"?>
<web-app 
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">

    <!-- Config here. -->

</web-app>

（是的，没有doctype！）

@ManagedBean无法在Tomcat和Jetty上运行。另见issue 1937。您需要至少升级到Mojarra 2.1.1（或者只是当前可用的2.1.17）。另一种方法是在faces-config.xml中手动注册托管bean，但这很简单。

无关，@ManagedBean(eager=true)仅适用于@ApplicationScoped。省略它。

在tomcat中部署JSF2应用程序时看不到欢迎页面

1 个答案: