JSF编程方式-如果关闭HtmlCommandButton，则不会调用Bean方法

Question

我正在尝试以编程方式创建一个HtmlCommandButton，遵循下面的示例

http://javaevangelist.blogspot.ch/2013/01/jsf-21-tip-of-day-programmatically.html

如果我添加了ajax行为，一切都会正常工作(即调用actionListener )，如果关闭ajax，它就不会工作。

支持bean：

@Named
@RequestScoped
public class CommandBean implements Serializable {

   public String generateUUID() {
        return java.util.UUID.randomUUID().toString();
    }
}

解决方案1(使用ajax)

private HtmlCommandButton createCommandButtonWithAjax(final FacesContext context,
        final String methodExpression, final String value) {

    Application application = context.getApplication();
    Class<?>[] clazz = new Class<?>[]{};
    HtmlCommandButton htmlCommandButton =
            (HtmlCommandButton) application.createComponent(HtmlCommandButton.COMPONENT_TYPE);
    htmlCommandButton.setValue(value);

    AjaxBehavior ajaxBehavior = (AjaxBehavior) FacesContext.getCurrentInstance().getApplication().createBehavior(AjaxBehavior.BEHAVIOR_ID);
    ((UIComponentBase)htmlCommandButton).addClientBehavior("click", ajaxBehavior);

MethodExpression actionListener = application.getExpressionFactory().createMethodExpression(FacesContext.getCurrentInstance().getELContext(), action, String.class, clazz);
button.addActionListener(new MethodExpressionActionListener(actionListener));

    return htmlCommandButton;
}

解决方案2(无ajax)

private HtmlCommandButton createCommandButton(final FacesContext context,
        final String methodExpression, final String value) {
    Application application = context.getApplication();
    Class<?>[] clazz = new Class<?>[]{};
    HtmlCommandButton htmlCommandButton =
            (HtmlCommandButton) application.createComponent(HtmlCommandButton.COMPONENT_TYPE);
    htmlCommandButton.setValue(value);
    htmlCommandButton.setActionExpression(JSFUtils.createMethodExpression(methodExpression, String.class, clazz));
    return htmlCommandButton;
}

调用代码：

createCommandButton(FacesContext.getCurrentInstance(),
                "#{commandBean.generateUUID()}", "Generate UUID");

JSFUtils：

  public static MethodExpression createMethodExpression(String methodExpression,Class<?> expectedReturnType,Class<?>[] expectedParamTypes) {
    FacesContext context = FacesContext.getCurrentInstance();
    return context.getApplication().getExpressionFactory()
            .createMethodExpression(context.getELContext(), methodExpression, expectedReturnType, expectedParamTypes);
  }

解决方案1有效，解决方案2无效:未调用bean方法generateUUID()。我也尝试过使用htmlCommandButton.setImmediate(true)来排除验证错误。