in Raspian (strech) there is no cryptmator-Package (armhf). I purged all previos installed openjdk-versions and installed Java8 and Java JDK from oracle. But i cannot start cryptomator. I searched the web and found the information, that JavaFX has been removed vom JDK for arm. I tried to install JavaFX manually and tried varios ways I found at the web. Now the App starts, no errors, but no gui.
Not sure if you can solve the JavaFX problem at all. I haven’t done any research on it, to be honest. You might experiment with Cryptomator CLI that works without a UI: https://github.com/cryptomator/cli
It’s currently in beta but you can share your experience with it and let us know if it works on Raspberry Pi.
The CLI beta is based on the same released crypto libraries as the desktop version. Thus the file encryption works the same way and is in fact not beta. Some features are missing in the CLI version though, e.g. the possibility to protect the webdav server with a password and similar stuff.
cryptomator-cli has not been updated since V6 of the file structure. If you try to run it now on an up-to-date cryptomator data set, it will error out saying it doesn’t support V7.