如何使用OGNL调用动作方法？

helloAction.java

public String getQuote()
{
    return "Don't think, just do";
}

success.jsp

<b>quote() :</b> <s:property value="quote()"/> <br>

struts.xml

<action name="greet" class="com.struts2.helloAction" >
    <interceptor-ref name="firewallStack"></interceptor-ref>
    <result name="SUCCESS">/WEB-INF/resources/success.jsp</result>
    <result name="input">/WEB-INF/resources/success.jsp</result>
</action>

我从struts 2
OGNL获得了ref链接

quote()不调用此方法。我正在使用xwork-2.0.1.jar和ognl-2.6.11.jar。