Eclipse struts 404 ?

谁能帮我看看上图到底哪错了吗，我都把struts简化成这样了它还给我报404错?

下面是LoginAction.java代码：

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{

private String username;
private 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(){
  System.out.println("ko");

  if(getUsername().equals("123")&&getPassword().equals("123")){
         return SUCCESS;
  }else{  
        return ERROR;
   }
 }

}

下面是login.jsp代码：