Help!_no Action mapped for action name HelloWorld

[lupus]

Hi all,

I am tring to integrate Struts 2 HelloWorld into my project, but there came
the error message:

 "There is no Action mapped for action name HelloWorld. - [unknown
location]", I think it is configuration problem, but do not know how to fix
it.

My project war structure like these:

/myproject/
 - index.html
 -/hello/HelloWorld.jsp
-/WEB-INF/
        - struts.xml
        - web.xml
-/WEB-INF/lib/web/HelloWorld.class

Here is my struts configure file 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.enable.DynamicMethodInvocation" value="false" />
        <constant name="struts.devMode" value="true" />

        <package name="hello" namespace="/hello" extends="struts-default">
                
                <!-- Add actions here -->
                <action name="HelloWorld" class="web.HelloWorld">
                               <result>/hello/HelloWorld.jsp</result>
                          </action>
        </package>
</struts>

And here is my web.xml file: 

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="GDI" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd";>
        <display-name>myproject</display-name>

        <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>

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


In the end, I test it in Tomcat using
http://localhost:8080/myproject/hello/HelloWorld.action,

"There is no Action mapped for action name HelloWorld. - [unknown location]

com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:186)

org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:41)
        
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:494)

org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:419)

"

Please help!!!

Thanks.

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