JSF验证集属性

Question

无论验证失败，我如何让JSF设置属性？如果验证失败，我希望设置下面的question.response对象。

<h:selectOneRadio id="questionId" value="#{question.response}" 
                validator="#{question.validate}" required="true"
                requiredMessage="You must answer the question to continue"
                class="radio-btn-set">
    <f:selectItem itemLabel="Yes" itemValue="Yes" />
    <f:selectItem itemLabel="No" itemValue="No" />
    <p:ajax update="msgQuestion" oncomplete="clearEmptyRows()" />
</h:selectOneRadio>