Struts中扩展ActionMapping的属性后如何在Action中得到它？

[l2g32003]

public class MyActionMapping
extends ActionMapping {
protected String myProperty;
public MyActionMapping() {
super();
}
public String getMyProperty() {
return myProperty;
}

public void setMyProperty(String myProperty) {
if (configured) {
throw new IllegalStateException("Configuration is frozen");
}
this.myProperty= myProperty;
}
配置文件
.....
.....
<action name="goodsActionForm"
className="com.MyActionMapping"
path="/goodsAction"
scope="request"
type="com.GoodsAction"
validate="false">
<set-property property="myProperty" value="myPropertValue"/>
<forward name="add" path="/message.jsp">
</forward>
</action>
.....
.....
请问在GoodsAction中我如何才能得到MyActionMapping的myProperty属性值？
在excetue（）中传入的是ActionMapping啊

[l2g32003]

重写excetue 把ActionMapping 换成MyActionMapping也不行，各位有什么办法？