我有一个表格，他们是一个下拉框和复选框。当我不提供任何输入时，我通过反馈面板收到错误消息集，代码如下

private Form<ReportCriteria> createCriteriaPanel(String id, IModel<ReportCriteria> model) {
            SelectionForm form = new SelectionForm(id, model);
            ReportCriteria criteria = (ReportCriteria) getDefaultModelObject();
           .......
           FeedbackPanel fb = new FeedbackPanel("feedback");
        fb.setOutputMarkupId(true);
        form.add(fb);
       DropDownChoice<Project> billableProjectsList = new DropDownChoice<>(
                    "projectsList",
                    ......
                    new ChoiceRenderer<Project>("fullNameWithCustomer"));

            form.add(billableProjectsList);

            CheckGroup<Project> unbillablePrjct = .......

            form.add(new FormComponentValidator(billableProjectsList, unbillablePrjct));
            form.getFeedbackMessages().clear();
    }

     protected void onSubmit() {

               SelectionForm.this.getFeedbackMessages().size());
              TimesheetExportCriteriaPanel.this.SelectionForm.findForm("criteriaForm").getFeedbackMessages();
}

所有的feedbackmessages值都是空的，并且不转发任何内容。当我没有提供任何输入时，我正确地从formvalidator接收到错误消息。当我提供输入并提交时，表单刷新并加载相同的错误消息。
当我们提供有效的输入时，我想让它清楚。在论坛上查看时，我发现wicket 6.x需要使用component.getfeedbackmessages（），但对我来说它是空的。
我是新来的。请帮助输入。

public class FormComponentValidator extends AbstractFormValidator {
    private static final long serialVersionUID = 1L;
    private FormComponent<?>[] components;

    @SuppressWarnings("unchecked")
    public FormComponentValidator(FormComponent<?> selectedBillableProject, FormComponent<?> selectedUnBillableProject) {
        components = new FormComponent[]{selectedBillableProject, selectedUnBillableProject};
    }

    /*
     * (non-Javadoc)
     * @see org.apache.wicket.markup.html.form.validation.IFormValidator#getDependentFormComponents()
     */
    public FormComponent<?>[] getDependentFormComponents() {
        return components;
    }

    /*
     * (non-Javadoc)
     * @see org.apache.wicket.markup.html.form.validation.IFormValidator#validate(org.apache.wicket.markup.html.form.Form)
     */
    public void validate(Form<?> form ) {

        if ((org.apache.commons.lang.StringUtils.isEmpty(components[0].getInput()) || components[0].getInput() == null )
                && (org.apache.commons.lang.StringUtils.isEmpty(components[1].getInput()) || components[1].getInput() == null)) {

                error(components[0], "project.Required");

            }
        }
    }

私有void configurefeedback（）{

// activate feedback panel
    final FeedbackPanel feedbackPanel = new FeedbackPanel("feedback");
    feedbackPanel.setOutputMarkupId(true);
    feedbackPanel.setVisible(false);

    add(feedbackPanel);

    // don't show filtered feedback errors in feedback panel
    final int[] filteredErrorLevels = new int[] { FeedbackMessage.ERROR };
    feedbackPanel.setFilter(new IFeedbackMessageFilter() {

        @Override
        public boolean accept(FeedbackMessage message) {

            for (int errorLevel : filteredErrorLevels) {
                if (message.getLevel() == errorLevel) {
                    return false;
                }
            }

            return true;
        }