新手使用SSH框架，发现表单提交的数据在action类中全部为null

本人是新手绝对的新手 不是计算机专业出身，完全自学了SSH，第一次将自己的所学集中起来凭着自己的感觉做一个小demo来玩，但是发现一个问题那就是，jsp表单中提交的一些数据，到了相应的action中全部为null，百思不得其解，我本人不在软件公司上班，从事的行业也不是软件行业所以找不到大牛帮我解决问题，现在求助各位论坛高手帮忙。
不罗嗦上代码：

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    

    <title>My JSP 'addNewBasicUser.jsp' starting page</title>

    

	<meta http-equiv="pragma" content="no-cache">

	<meta http-equiv="cache-control" content="no-cache">

	<meta http-equiv="expires" content="0">    

	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

	<meta http-equiv="description" content="This is my page">

	<!--

	<link rel="stylesheet" type="text/css" href="styles.css">

	-->



  </head>

  

  <body>

    <form action="rootuser/addOneNewBranch" method="post">

    	用户名：<input type="text" name="username"/><br/>

    	密码：<input type="text" name="password"/><br/>

    	支行名称：<input type="text" name="branchbankname"/><br/>

    	<input type="submit" value="提交"/>

    </form>

  </body>

</html>

这是对应的action类

package com.actions;



import javax.annotation.Resource;



import com.dao.interfaceImp.BasicUserDaoImp;

import com.xu.model.BasicUser;

import com.xu.utils.MD5;



public class AddNewBranchBank {

	private String username;

	private String password;

	private String branchbankname;

	private BasicUserDaoImp budi;

	public BasicUserDaoImp getBudi() {

		return budi;

	}

	@Resource(name="BasicUserDaoImp")

	public void setBudi(BasicUserDaoImp budi) {

		this.budi = budi;

	}

	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 getBranchbankname() {

		return branchbankname;

	}

	public void setBranchbankname(String branchbankname) {

		this.branchbankname = branchbankname;

	}



	public String execute(){

		System.out.println(branchbankname+":"+username+":"+password);

		try{

		BasicUser bu = new BasicUser();

		bu.setBranchBankName(branchbankname);

		bu.setUsername(username);

		bu.setPassword(MD5.encrypeMd5(password));

		budi.addNewBasicUser(bu);

		} catch(Exception e){

			e.printStackTrace();

			return "input";

		}

		return "success";

	}

}

这是相关的struts配置

<package name="rootuser" namespace="/rootuser" extends="struts-default">

   		 <interceptors>

    	<interceptor name="rootUserTypeCheck" class="com.xu.interceptors.RootUserCheck"/>

    	<interceptor-stack name="rootUserCheck">

    		<interceptor-ref name="rootUserTypeCheck"/>

    		<interceptor-ref name="defaultStack"/>

    	</interceptor-stack>

    </interceptors>

     

    <global-results>

   		<result name="input">/RootLogin/rootlogin.jsp</result>

    </global-results>

    <action name="login" class="com.actions.RootLogin">  

    	<result name="success">/WEB-INF/jsps/RootUser/desktop.jsp</result>

    </action>

    <action name="addNewBasicUser">

    	<interceptor-ref name="rootUserTypeCheck"/>

    	<result>/WEB-INF/jsps/RootUser/addNewBasicUser.jsp</result>

    </action>

    <action name="addOneNewBranch" class="com.actions.AddNewBranchBank">

    	<interceptor-ref name="rootUserTypeCheck"/>

    	<result name="success">/WEB-INF/jsps/RootUser/desktop.jsp</result>

    </action>

    </package>

现在的问题是我的action类中的execute方法执行后后台system.out.println打印出来的全部是null而且报空指针错。
现在请各位高手们帮我看看，我这到底是什么地方出问题了。