Java Struts2（未找到 Action 类）
[英]Java Struts2 (Action class not found)
问题描述
The error which I am getting.
我得到的错误。 It was running all fine a day before but when open it today I get the following errors.前一天运行良好，但今天打开时出现以下错误。
Action class [com.tutorialspoint.struts2.HelloWorldAction] not found - action - file:/C:/Users/sai/Struts2/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/HelloWorldStruts2/WEB-INF/classes/struts.xml:10:30
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyAction(XmlConfigurationProvider.java:374)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:329)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:429)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:239)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:152)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:205)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4828)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5508)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1575)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
My index.jsp page我的 index.jsp 页面
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Hello World</title>
</head>
<body>
<h1>Hello World From Struts2</h1>
<form action="hello">
<label for="name">Please enter your name</label><br/>
<input type="text" name="name"/>
<input type="submit" value="Say Hello"/>
</form>
</body>
</html>
My struts.xml file我的 struts.xml 文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<package name="helloworld" extends="struts-default">
<action name="hello"
class="com.tutorialspoint.struts2.HelloWorldAction"
method="execute">
<result name="success">/HelloWorld.jsp</result>
<result name="error">/AccessDenied.jsp</result>
</action>
</package>
</struts>
The action mapping ---- I tried hello as action name and also hello.action as action name but got the same error动作映射 ---- 我尝试将 hello 作为动作名称，也尝试将 hello.action 作为动作名称，但得到了相同的错误
My web.xml file我的 web.xml 文件
<?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_3_0.xsd"
id="WebApp_ID" version="3.0">
<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>
Even after cleaning the project redeploying it and again restarting the server I was not able to remove the error.即使在清理项目并重新部署它并再次重新启动服务器之后，我也无法消除错误。
4 个解决方案
解决方案1
2 已采纳 2015-06-17 07:58:32
Struts2 XML configuration provider cannot load the action class. Struts2 XML 配置提供程序无法加载操作类。 This class com.tutorialspoint.struts2.HelloWorldAction is not available on the classpath or corrupted.此类com.tutorialspoint.struts2.HelloWorldAction在类路径上不可用或已损坏。 The version are you using is too old, and you need to recreate the project and update version information in xml configuration files struts.xml , web.xml .您使用的版本太旧，您需要重新创建项目并更新 xml 配置文件struts.xml 、 web.xml版本信息。
See How To Create A Struts 2 Web Application .请参阅如何创建 Struts 2 Web 应用程序。
解决方案2
0 2017-10-24 04:07:52
In my case, a simple mistake occurred on project build path: I placed the JRE Library and Maven Dependencies on top of src/main/java and src/main/resources.就我而言，在项目构建路径上发生了一个简单的错误：我将 JRE 库和 Maven 依赖项放在 src/main/java 和 src/main/resources 之上。
The correct order in Project Java Build Path is: Project Java Build Path 中的正确顺序是：
src/main/java
src/main/resources
src/test/java
JRE System Library
Maven Dependencie
解决方案3
0 2018-12-02 11:21:38
对我来说，只需清理项目，再次重建它并在 tomcat 上重新部署它就可以了。
解决方案4
-1 2018-03-14 04:43:23
Placed the struts.xml file in webcontent->web-inf folder.将 struts.xml 文件放在 webcontent->web-inf 文件夹中。 Hope it will solved ur problem.希望它能解决你的问题。
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