The examples are a little bit outdated but we are currently working to provide a new one (hopefully available in this year).
In the mean time: https://neo4j.com/docs/ogm-manual/current/tutorial/ at least offers some kind of walk through. If you ignore the dated technology choices taking there, you get some follow along snippets.
Thanks for pointing this out. We did an update to the documentation and we also changed the link. But there was a missing bit inside. The new link is: neo4j-ogm/neo4j-ogm-example at master · neo4j/neo4j-ogm · GitHub This one refers to the sources that are presented in the tutorial.