Although it doesn’t make sense that jdbc driver is not installed, I installed it according to the instruction:
https://jdbc.postgresql.org/documentation/head/classpath.html
It still doesn’t work.
Any help is greatly appreciated
export CLASSPATH=/home/tony/venv/lib/python3.6/site-packages/anvil_app_server/anvil-app-server.20200515-134353.jar:/home/tony/jdbc/postgresql.jar:.
java -jar /home/tony/venv/lib/python3.6/site-packages/anvil_app_server/anvil-app-server.20200515-134353.jar --app No_background --origin http://45.75.157.108 --database postgres://not_real:My-pass@not_real.db.elephantsql.com:321/not_real