如果数据输入错误，如何创建对话框？

如何解决如果数据输入错误，如何创建对话框？

到目前为止我尝试使用这个

public void saveProjects(Projects project) throws Exception {
        String query = "Insert into project (created_by,end_date,id,project_name,start_date) values ('"
                + project.getCreated_by() + "','" + project.getEnd_date() + "'," + project.getId() + ",'"
                + project.getProject_name() + "','" + project.getStart_date() + "')";
        try {
            statement.execute(query);
        } catch (sqlException e) {
            System.out.println("Hiba a projekt mentésekor:");
            e.printstacktrace();
            Stage hiba = new Stage();

            hiba.initModality(Modality.APPLICATION_MODAL);
            hiba.setTitle("Hoppá!");
            Label leiras = new Label("Nem megfelelő formátum!");
            Button ok = new Button("Ok");
            ok.setonAction(h -> hiba.close());
        }
        
    }

但它只在控制台中打印出异常。我使用 javaFX。