JSF + Primefaces p:ajax on p:selectOneMenu未触发

<p:ajax event="change" update="@form" />

<p:selectOneMenu id="selectOneMenu" value="#{bean.selectedItem}">
  <f:selectItem itemLabel="Item 1" itemValue="1" />
  <f:selectItem itemLabel="Item 2" itemValue="2" />
  <f:selectItem itemLabel="Item 3" itemValue="3" />
  <f:ajax listener="#{bean.handleSelectOneMenu}" />
</p:selectOneMenu>

@ManagedBean
@ViewScoped
public class Bean {

  private String selectedItem;

  public void handleSelectOneMenu() {
    // 处理SelectOneMenu组件的选择事件
  }

  // 其他方法
}