Question

我正在学习JSF并从Exadel.com获得帮助。我按照那里描述的步骤。

web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">
    <display-name>FBApp</display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>server</param-value>
    </context-param>

    <context-param>
        <param-name>javax.faces.CONFIG_FILES</param-name>
        <param-value>/WEB-INF/faces-config.xml</param-value>
    </context-param>

    <listener>
        <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
    </listener>

    <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>/faces/*</url-pattern>
    </servlet-mapping>
</web-app>

faces-config.xml中：

<?xml version="1.0" encoding="UTF-8"?>

<faces-config 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_1_2.xsd"
    version="1.2">

    <navigation-rule>
        <from-view-id>/pages/inputname.jsf</from-view-id>
        <navigation-case>
            <from-outcome>greeting</from-outcome>
            <to-view-id>/pages/greeting.jsf</to-view-id>
        </navigation-case>
    </navigation-rule>
    <managed-bean>
        <managed-bean-name>personBean</managed-bean-name>
        <managed-bean-class>com.fbapp.bean.PersonBean</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>

</faces-config>

的index.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>index</title>
</head>
<body>
    <jsp:forward page="faces/pages/inputname.jsf" />
</body>
</html>

inputname.jsp：

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<html>
 <head>
  <title>enter your name page</title>
 </head>
 <body>
   <f:view>
     <h1>
      <h:outputText value="JSF KickStart"/>
     </h1>
     <h:form id="helloForm">
      <h:outputText value="Tell us your name"/>
      <h:inputText value="#{personBean.personName}" />
      <h:commandButton action="greeting" value="Say Hello" />
     </h:form>
   </f:view>
 </body>
</html>

现在存在的差异是：

在index.jsp中，我使用了<jsp:forward page="faces/pages/inputname.jsf" />，Exadel使用了<jsp:forward page="/pages/inputname.jsf" />
我使用了<url-pattern>/faces/*</url-pattern>，他们使用了：<url-pattern>*.jsf</url-pattern>

jar库是：

公地BeanUtils的-1.7.0.jar
公地编解码器-1.3.jar
公地集合-3.1.jar
公地消化器-1.7.jar
公地-EL-1.0.jar
公地文件上传-1.0.jar
公地琅2.1.jar
共享记录-1.0.4.jar
公地验证-1.1.4.jar
JSF的API-1.2.jar
JSF的参数impl-1.2-NIGHTLY_20060227.jar
JSTL-1.1.2.jar
口 - 2.0.8.jar
XML的API-1.0.b2.jar

在JBoss 4.2.2GA中（为JSF定制）我将战争部署为运行但当我尝试转到URL http://localhost:8080/FBApp/时，页面呈现为：

ERROR

实际上是inputname.jsf的代码。我做错了什么？任何信息都会很明显。

谢谢和问候。

编辑：代码已根据BalusC的指示进行了更改。现在我得到异常和stacktrace：

19:34:04,244 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
    at com.sun.faces.taglib.jsf_core.ViewTag.doStartTag(ViewTag.java:162)
    at org.apache.jsp.pages.inputname_jsp._jspx_meth_f_005fview_005f0(inputname_jsp.java:104)
    at org.apache.jsp.pages.inputname_jsp._jspService(inputname_jsp.java:77)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
    at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:694)
    at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:665)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:63)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
    at java.lang.Thread.run(Thread.java:636)
19:34:04,245 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
    at com.sun.faces.taglib.jsf_core.ViewTag.doStartTag(ViewTag.java:162)
    at org.apache.jsp.pages.inputname_jsp._jspx_meth_f_005fview_005f0(inputname_jsp.java:104)
    at org.apache.jsp.pages.inputname_jsp._jspService(inputname_jsp.java:77)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
    at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:694)
    at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:665)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:63)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
    at java.lang.Thread.run(Thread.java:636)

Answer 1

如果您为实际 JSP文件提供.jsf扩展名，则会发生这种情况。换句话说，您的网络内容文件夹中没有inputname.jsp文件，但实际上一个inputname.jsf文件。这是错的。这些JSP文件应保留.jsp扩展名，以便JspServlet处理。否则，这些文件根本不会被解析为JSP，最终会以webbrowser中的纯文本结尾。

您已将FacesServlet的网址格式更改为/faces/*，而不是（推荐的更多）*.jsf。因此，您应该将教程中的所有网址从/foo.jsf更改为/faces/foo.jsp，也可以在转发/包含和导航案例中。您应该不更改为/faces/foo.jsf并在实际文件中使用错误的扩展名。

对具体问题

无关：您是否有任何特殊原因要阅读6年历史的JSF 1.1目标教程而不是更新的JSF 2.0目标教程？ JSF 1.1拥有如此多的disadvantages，并且自1.5年前以来，Facelets也继承了传统的JSP。

根据对问题的评论

更新：

@cularis这是我的第一个项目。我得到了java.lang.ClassCastException: com.sun.faces.application.ApplicationAssociate cannot be cast to com.sun.faces.application.ApplicationAssociate，我在这里找到了这个问题的解决方案并按照说法完成了，问题解决了。我正在使用JBoss 4.2.2和JSF 1.2

如果运行时类路径被不同版本化的JSF库污染，则会发生此异常。 JBoss已经内置了JSF，因此您不应该在webapp的/WEB-INF/lib文件夹中提供JSF库。如果它是不同的版本，它可能会与上述异常相冲突。

根据问题更新

更新2 ：

java.lang.NullPointerException
    at com.sun.faces.taglib.jsf_core.ViewTag.doStartTag(ViewTag.java:162)

嗯，这是一个讨厌的，我以前没见过。我敢打赌它只是因为类路污染造成的。 JBoss 4.2.x已经内置了JSF 1.2和JSTL 1.1。请从/WEB-INF/lib中删除jsf * .jar和jstl * .jar库。另请从<context-param>删除所有与JSF相关的<listener>和web.xml个人。你到目前为止已经是所有的JSF 1.2默认值。它可能会或可能不会解决您的具体问题，但至少应该将噪音降至最低。让我知道。

根据评论

更新3 ：

我已从web.xml中删除了jar和条目，并在jboss-4.2.2.GA/server/default/deploy/jboss-web.deployer/conf/web.xml中取消注释了注释行，现在我我得到了java.lang.RuntimeException: Cannot find FacesContext。但是之前的问题已经解决了

好多了。 Cannot find FacesContext错误有一个简单的原因：FacesServlet尚未被调用。因此，请求或转发网址根本不符合FacesServlet的网址格式。假设您仍然将FacesServlet映射到/faces/*的网址格式，并且您的网络内容中包含实际/pages/inputname.jsp文件，那么您的所有index.jsp应包含的是以下单行（是的，除去所有不相关的HTML）

<jsp:forward page="faces/pages/inputname.jsp" />

这样只需调用

http://localhost:8080/FBApp/

应该有效。如果它由于某种原因（让我知道），那么至少打电话

http://localhost:8080/FBApp/faces/pages/inputname.jsp

必须工作。

根据评论

更新4 ：

解决了FacesContext异常，但现在它正在抛出javax.faces.FacesException: java.net.MalformedURLException: Path faces-config.xml does not start with a "/" character.

嗯，这对我来说也是新的。您的web.xml现在如何？这表明您的javax.faces.CONFIG_FILES上下文参数的值为faces-config.xml。尝试将值javax.faces.CONFIG_FILES的{{1}}上下文参数放回/WEB-INF/faces-config.xml。也许JBoss中使用的JSF 1.2 impl有一些与此相关的bug。

Answer 2

如果你是初学者，你应该真正开始阅读JSF 2.0，而不是旧的弃用1.1。有很多与JSF相关的书籍。最好成绩

浏览器上显示JSF代码

2 个答案: