Estoy usando<s:form action="someAction">

my struts.xml contiene

<action name="someAction" 
        class="com.test.testaction.getValue" 
        method="getValuedemo">
    <result name="success" type="redirectAction">demo</result>   
</action> 

while my Action contiene

public class getValue extends ActionSupport{
    private String userName;

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getValuedemo() {
        userName = "tmpUser";
    }
}

Mi pregunta es cómo obtener la propiedad userName en demo.action ????? Por favor ayud