A few years ago this Diagnose JDBC proxy connection article was really useful to point people to if they had an issue with JDBC/UCP connections in ORDS. Since then ORDS has moved to Java 11 so an update on the steps is long overdue…
…and it is now available at https://github.com/pobalopalous/ords-ucp-example. There you will find a class that does the same JDBC proxy test but getting it running is much simpler.
Simply clone the repository or download it as a zip file and follow the steps in the README.
This test could be used with the standard Oracle JDBC/UCP distributed jars but the original intention is use the jars that are distributed with ORDS. Your version of ORDS might be different so the README shows steps to find the exact jar names to use.
Peter's Random Topic Library 