ssh2整合，action配置问题 - java报错

我将action的class配置成这样下面这样出错，必须加上全类名才能访问，不知怎么解决？？

<?xml version="1.0"?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
	<!-- 配置常量 -->
	<constant name="struts.ui.theme" value="simple" />
	<constant name="struts.devMode" value="true" />
	<!-- 允许静态方法调用 -->
	<constant name="struts.ognl.allowStaticMethodAccess" value="true" />
	<constant name="struts.objectFactory" value="spring" />

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

		<!-- 注册用户 -->
		<action name="UserRegAction_*" class="userRegAction" method="{1}">
			<result name="registUserPage">jsp/user/regist.jsp</result>
		</action>
	</package>
</struts>

@Controller
@Scope("prototype")
public class UserRegAction extends BaseAction<User> {

可是就是报这个错

Unable to instantiate Action, userRegAction, defined for 'UserRegAction_toRegPage' in namespace '/'userRegAction