Event Handling :

<h:selectOneRadio id="category"
  value="#{CDManagerBean.cd.category}"
  immediate="true"
  onclick="submit()"
  valueChangeListener="#{CDManagerBean.categorySelected}">
    <f:selectItems value="#{CDManagerBean.categories}"/>
</h:selectOneRadio>

Event Handling Method :

public void categorySelected(ValueChangeEvent event) {
    subCategoryList.setRendered(true);

    String value = (String) event.getNewValue();

    if (value != null) {
        this.subCategories = this.getSubcategoriesList(value);
    }

    FacesContext context = FacesContext.getCurrentInstance();
    context.renderResponse();
}

Managed Bean :

<managed-bean>
  <description>The "backing file"
    bean that backs up the CD application</description>
  <managed-bean-name>CDManagerBean</managed-bean-name>
  <managed-bean-class>
    com.arcmind.jsfquickstart.controller.StoreController
      </managed-bean-class>
  <managed-bean-scope>session</managed-bean-scope>
</managed-bean>

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