gradle - Vaadin 12，Tomcat：找不到基本名称的捆绑包

Question

在我的 Vaadin 12 项目中，资源包文件 ( *.properties) 位于文件夹中

\src\main\resources\

在这个文件夹中，我有文件：labels_es.properties, labels_en.properties

在我的 MyForm.kt

  val labels = ResourceBundle.getBundle("labels", utf8Control)


    companion object {      
        val utf8Control = UTF8Control()

    }

但是当将战争部署到 Tomcat 9 并运行我的网络应用程序时，我得到了错误：

Vaadin 12 ResourceBundle.getBundle Caused by: java.util.MissingResourceException: Can't find bundle for base name

Caused by: java.util.MissingResourceException: Can't find bundle for base name labels, locale es
        at java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:1564)
        at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1387)
        at java.util.ResourceBundle.getBundle(ResourceBundle.java:1299)
        at com.myproject.MyForm.<init>(MyFormt.kt:47)
        ... 43 common frames omitted