На этот вопрос уже есть ответ здесь:

Я просмотрел все похожие Q на stackoverflow, но это не помогло, извините. Основное отличие от всех них заключается в том, что я получил ПУСТОЕ имя действия в сообщении об ошибке. Поиск в Google не помог :( Надеюсь, что кто-то может дать подсказку, где искать источник проблемы. Thx

Error:

HTTP Status 404 - There is no Action mapped for namespace [/] and action name [] associated with context path [/LoginApplication].

--------------------------------------------------------------------------------

type Status report

message There is no Action mapped for namespace [/] and action name [] associated with context path [/LoginApplication].

description The requested resource (There is no Action mapped for namespace [/] and action name [] associated with context path [/LoginApplication].) is not available.

WARNING: Could not find action or result: /LoginApplication/
There is no Action mapped for namespace [/] and action name [] associated with context path [/LoginApplication]. - [unknown location]
    at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
    at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
    at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:37)
    at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:552)
    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

web.xml

<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
<display-name>Struts 2 Web 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>

</web-app>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
<constant name="struts.devMode" value="true" />

<constant name="struts.custom.i18n.resources" value="ApplicationResources" />

<package name="user" namespace="/" extends="struts-default">
<!-- http://localhost:8080/Struts-Example/User/Login.action -->
<action name="login">
<result>/Pages/HomePage.jsp</result>
</action>

<action name="validatelogin" class="/LoginApplication/src/ValidateLogin"
method="execute">
<result name="Success">/Pages/Success.jsp</result>
<result name="Failure">/Pages/Failure.jsp</result>

</action>
</package>
</struts>

Страницы: HomePage.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>Validate Login</title>
</head>
<body>
<s:form action="login" method="execute">
<s:textfield name="username" key="Username" size="20" />
<s:password name="password" key="Password" size="20" />
<s:submit />
</s:form>
</body>
</html>

success.jsp

<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>

<head>
<title>Login Application - Authorized</title>
</head>

<body>
Congratulations, <s:property value="username" />!
Welcome to Struts 2 world.
</body>
</html>

Failure.jsp

<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>

<head>
<title> Login Application - Unauthorized</title>
</head>

<body>
Sorry, You have entered an invalid Username / Password
</body>
</html>

ValidateLogin.java

public class ValidateLogin 
{
public String username;
public String password;

public String getUsername() 
{
    return username;
}

public void setUsername(String username) 
{
    this.username = username;
}

public String getPassword() 
{
    return password;
}

public void setPassword(String password) 
{
    this.password = password;
}

public String execute() 
{
    if (this.username.equals("pinkesh") &&    
this.password.equals("pinkesh"))//((this.username.equals("pinkesh")) &   
(this.password.equals("pinkesh")))
        return "Success";
    else
        return "Failure";
}
}

хорошо .. изображение невозможно, поэтому структура проекта:

src/
----ValidateLogin.Java
WenCOntent
-----+User
--------+Pages
------------+HomePage.jsp
------------+Success.jsp
------------+Failure.jsp
-----+web.xml
-----+struts.xml