Struts2 Hello World jsp示例错误 [英] Struts2 Hello World jsp example error

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本文介绍了Struts2 Hello World jsp示例错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试在Tomcat 6中运行Hello World Struts2项目。

I am trying to run a Hello World Struts2 project in Tomcat 6.

我一直在：

  root cause: java.lang.ClassNotFoundException: org.apache.struts2.interceptor.SessionAware

  java.lang.NoClassDefFoundError: org/apache/struts2/interceptor/SessionAware
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1374)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
    at com.opensymphony.xwork2.util.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:138)
    at com.opensymphony.xwork2.ObjectFactory.getClassInstance(ObjectFactory.java:96)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyAction(XmlConfigurationProvider.java:398)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:355)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:460)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:265)
    at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111)
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:189)
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:360)
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:403)
    at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:190)

但是我在项目的WEB-INF / lib文件夹中有struts2所需的jar。

However I do have the required jars for struts2 in the WEB-INF/lib folder for the project.

Jars：

struts-core
xwork
ognl
freemarker
commons-fileupload
commons-io
commons-lang

struts-core xwork ognl freemarker commons-fileupload commons-io commons-lang

任何想法？

我跟随了一个在线Struts2 HelloWorld示例：

I followed an online Struts2 HelloWorld example:

HelloWorld.action类：

HelloWorld.action class:

  package za.co.vine.tutorialspoint.struts2;

  public class HelloWorldAction{
  private String name;

  public String execute() throws Exception {
  return "success";
  }

  public String getName() {
  return name;
  }

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

HelloWorld.jsp：

HelloWorld.jsp:

  <%@ page contentType="text/html; charset=UTF-8" %>
  <%@ taglib prefix="s" uri="/struts-tags" %>
  <html>
  <head>
  <title>Hello World</title>
  </head>
  <body>
     Hello World, <s:property value="name"/>
  </body>
  </html>

index.jsp：

index.jsp:

  <%@ 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>

struts.xml：

struts.xml:

  <?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="za.co.vine.tutorialspoint.struts2.HelloWorldAction" 
        method="execute">
        <result name="success">/HelloWorld.jsp</result>
     </action>
  </package>
  </struts>

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_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>


推荐答案

只需在WEB-INF中添加以下Jars / lib目录下。如果您不需要，请删除所有相关的罐子。

Just add the following Jars only in the WEB-INF/lib. Remove all related jars if you don't have need.

asm-3.3.jar
asm-commons-3.3.jar
asm-tree-3.3.jar
commons-fileupload-1.2.2.jar
commons-io-2.0.1.jar
commons-lang3-3.1.jar
freemarker-2.3.19.jar
javaassist-3.11.0.GA.jar
ognl-3.0.5.jar
struts2-core-2.3.7.jar
xwork-core-2.3.7.jar

如果您没有这些罐子，请下载它。

If you dont have these jars then download it.

此处 org.apache.struts2.dispatcher.FilterDispatcher 现已弃用。所以编辑您的web.xml

Here org.apache.struts2.dispatcher.FilterDispatcher is now deprecated .So Edit your web.xml from

<?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>

到

<?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>Struts2 Application</display-name>

  <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
   </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

  <welcome-file-list>
    <welcome-file>/index.jsp</welcome-file>  
  </welcome-file-list>
</web-app>

我想这可以帮到你。

这篇关于Struts2 Hello World jsp示例错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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