I use 4.3.11 in my Liberty projects but there is a bug with Hibernate solved in version 5. I have tried upgrading but I get different exceptions.
Anybody is using Hibern
As of Hibernate 5.2.13, a proper transaction integration has been delivered for Liberty. If you are able to upgrade to this version of Hibernate, then it will be detected and applied automatically, and not necessary to specify hibernate.transaction.jta.platform anymore.
See this Hibernate issue for more details: https://hibernate.atlassian.net/browse/HHH-11571