Update 2019-10:
As stated in the issue tracker, Google has been working on a new SDK tools release that runs on current JVMs (9+)!
You can download and use the new Android SDK Command-line Tools (1.0.0) inside Android Studio or by manually downloading them from the Google servers:
For the latest versions check the URLs inside the repository.xml.
If you manually unpack the command line tools, take care of placing them in a subfolder inside your $ANDROID_HOME
(e.g. $ANDROID_HOME/cmdline-tools/...
).