命名空间[/]和与上下文路径[/ projectName]关联的操作名称[actionName]没有映射。

Question

我正在使用注释开发struts 2.0并创建了一个web项目，我正在进行登录并重定向成功登录到另一个jsp。但是，每当我尝试登录时，它都会显示一条错误消息： - 没有映射名称空间[/]的动作和与上下文路径[/ strutsDemo2]相关联的动作名称[welcome]。

我已将以下jar文件添加到我的项目中：

asm-3.3.jar asm-all-2.2.3.jar cglib-nodep-2.2.3.jar commons-fileupload-1.3.jar commons-io-2.0.1.jar commons-lang3-3.1.jar freemarker-2.3。 19.jar javassist-3.11.0.ga.jar ognl-3.0.6.jar struts2-convention-plugin-2.3.15.1.jar struts2-core-2.3.15.1.jar xwork-core-2.3.15.1.jar

我的jsp是：

   <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
  pageEncoding="ISO-8859-1"%>
 <%@taglib uri="/struts-tags" prefix="s" %>
<!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>Demo</title>
</head>
<body>
<s:form action="welcome" validate="true">
    <s:textfield name="userName" label="userName"></s:textfield>

    <s:submit value="submit"></s:submit>
</s:form>
</body>
</html>

我的动作类是：

         import org.apache.struts2.convention.annotation.Action;
         import org.apache.struts2.convention.annotation.Namespace;
    import org.apache.struts2.convention.annotation.Result;
    import org.apache.struts2.convention.annotation.ResultPath;
    import org.apache.struts2.convention.annotation.Results;

    import com.opensymphony.xwork2.ActionSupport;
    import com.opensymphony.xwork2.validator.annotations.RequiredStringValidator;
    import com.opensymphony.xwork2.validator.annotations.ValidatorType;

@Namespace("/")
@ResultPath("/")

@Results({
       @Result(name="success", location="/Welcome.jsp"),
       @Result(name="input", location="/index.jsp")
    })
public class Welcome extends ActionSupport{

    private String userName;
    private String message;

    @RequiredStringValidator(type=ValidatorType.FIELD, message="Name is Required")
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }

    @Action(value="welcome")
    public String execute()
    {
        return SUCCESS;
    }



}

Veb.hml：

     <?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>strutsDemo2</display-name>
  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>
        org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
    </filter-class>
    <init-param>
         <param-name>struts.devMode</param-name>
         <param-value>true</param-value>
      </init-param>
    </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.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>