We have been using hibernate.hbm2ddl.auto=create with Hibernate 4.3 in the setup method for our integration tests on our CI server. The first test would be run against an empty database and just create the schema. All subsequent tests would drop the existing schema and then create a clean copy.

Now that I'm trying to upgrade to 5.1 our build process has broken because it tries to drop the schema on the first test even though it doesn't exist. Because that functionality has changed and I didn't see any mention of that in the migration guides I figured that was a bug.