我尝试了很多方法来解决这个问题。但问题出在我使用的JDK上。

安装的JDK是openjdk-13.0.1.jdk，根据official document对于NativeScript Environment的配置，必须安装JDK 8，所以我安装了它，它工作得很棒。我没有检查它是否可以与JDK 9一起使用。

Webpack compilation complete. Watching for file changes.
Webpack build done!
         + applying user-defined configuration from /Users/Public/projects/myproject/App_Resources/Android/before-plugins.gradle
Built aar for nativescript-google-maps-sdk
Project successfully prepared (android)
Building project...
Gradle build...