It is surprisingly hard to get spring integration tests running on an oracle DB. So here I'll document how.
Note that I have limited knowledge about Oracle DBs; the only target of this guide is to get it working somehow. If you are looking for a stable / sensible setup, you unfortunately need to look somewhere else (and then tell me in the comments!).
First, choose the docker image of the version of interest. You can find those here: https://container-registry.oracle.com/