Struts2 Hello World jsp example error

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

I keep getting:

  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)

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

Any ideas?

I followed an online Struts2 HelloWorld example:

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:

  <%@ 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:

  <%@ 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:

  <?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>

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

If you dont have these jars then download it.

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>

<?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>

I guess this could do the work for you.

It seems the version of xwork-core jar that you are using is not compatible with the versions of other jars.

Try using xwork-2.1.2.jar. I have used it earlier successfully.

If it still does not work, be sure you use the same versions of each and every jar as in the sample application.

EDIT:

As per your code, try changing

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

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

It seems that since you have not called the setter, Struts is searching for the property name in the session.

Regarding your question, the problem might be in the server or in your IDE tool so clean both of them under project clean and under server clean respectively.

If you face the same problem again download struts2 from this link

struts2 Just you have to copy the struts-blank.war from that folder and with the new workspace run one program (that struts-blank.war contains test programs) definitely it will work.

No classdeffound error usually comes when you haven't got that class in classpath or there are more than one versions of that class in classpath. Troubleshoot using these two options you are there. I encountered this when I was working on my JSP examples for code samples.

来源：https://stackoverflow.com/questions/14278258/struts2-hello-world-jsp-example-error

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