资源在Struts 2中不可用 [英] Resource not available in Struts 2

问题描述

我是Struts的新手，我想执行HelloWorld程序，但是一旦在web.xml中写入<filter>标记，就会收到请求的资源不可用"错误.

I am new to Struts and I want to execute HelloWorld program, but I am getting "Requested resource not available" error as soon as I write a <filter> tag in web.xml.

web.xml:

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>Struts 2</display-name>
   <welcome-file-list>
      <welcome-file>index.jsp</welcome-file>
   </welcome-file-list>

   <filter>
      <filter-name>struts2</filter-name>
      <filter-class>
         org.apache.struts2.dispatcher.FilterDispatcher
      </filter-class>
   </filter>

   <filter-mapping>
      <filter-name>struts2</filter-name>
      <url-pattern>/*</url-pattern>
   </filter-mapping>
</web-app>

struts.xml:

struts.xml :

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
   "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
   "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
   <package name="helloworld" extends="struts-default">
      <action name="hello" class="sagar.practice.HelloWorldAction" method="execute">
            <result name="success">/HelloWorld.jsp</result>
      </action>
   </package>
</struts>

我将所有必需的struts jar添加为用户库.

I added all required struts jars as a user library.

我正在以http://localhost:8080/practice/index.jsp

如果我从web.xml文件中删除<filter>标记，则可以访问index.jsp页面，但是如果添加<filter>标记，则会出现请求的资源不可用"错误.

If I remove <filter> tag from web.xml file I am able access index.jsp page, but if I add <filter> tag it is giving "Requested resource not available" error.

推荐答案

您应通过在struts.xml中设置常量来打开devMode.如果您想解决像您这样的问题，可以使用此模式.它提供了更多信息，因为它会将正常模式下隐藏的错误输出到控制台.

You should turn on devMode on via setting a constant in the struts.xml. This mode is used if you want to troubleshot some issues like yours. It's more informative because it outputs to the console errors that are hidden in the normal mode.

<constant name="struts.devMode" value="true" />  

打开它后，您可能会发现您的应用程序部署的库集有误或不一致.您可能会发现java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils打印到控制台，然后使用缺少的jar来调整库集.

After turning it on you may discover that you have wrong or inconsistent library set deployed with your application. You might find a java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils printed to the console, then adjust your library set with missing jars.

commons-lang3-3.1.jar是解决错误所必需的.

The commons-lang3-3.1.jar is required to resolve error.

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