asked on

After logging with name, error 500 message is displayed

Receiving error as follows. Please do needful.
HTTP Status 500 - Filter execution threw an exception
exception :
javax.servlet.ServletException: Filter execution threw an exception
root cause :
java.lang.Error: Unresolved compilation problems:
      The import com.opensymphony cannot be resolved
      The import com.opensymphony cannot be resolved
      The import com.opensymphony cannot be resolved
      ActionSupport cannot be resolved to a type
      ValueStack cannot be resolved to a type
      ActionContext cannot be resolved

      com.tutorialspoint.struts2.HelloWorldAction.<init>(HelloWorldAction.java:5)
      sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
      sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
      sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
      java.lang.reflect.Constructor.newInstance(Unknown Source)
      java.lang.Class.newInstance(Unknown Source)
      com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:130)
      com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:161)
      com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:150)
      com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:120)
      com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:300)
      com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:400)
      com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:194)
      org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
      org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
      com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
      org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:500)
      org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
My code as follows :
HelloWorld.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>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Hello World</title>
</head>
<body>
Entered value : <s:property value = "name"/><br/>
Value of key 1 : <s:property value = "key1" /><br/>
Value of key 2 : <s:property value = "key2" /> <br/>
</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>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<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>
HelloWorldAction.java
package com.tutorialspoint.struts2;

import java.util.*;

import com.opensymphony.xwork2.util.ValueStack;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class HelloWorldAction extends ActionSupport {
private String name;

public String execute() throws Exception {
ValueStack stack = ActionContext.getContext().getValueStack();
Map<String, Object> context = new HashMap<String, Object>();

context.put("key1", new String("This is key1"));
context.put("key2", new String("This is key2"));
stack.push(context);

System.out.println("Size of the valueStack: " + stack.size());
return "success";
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
}
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 = "com.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" 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>Ognlvaluestack</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>

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