EntityManager clear behaviour

[jamescarter]

Batoo seems to rollback the transaction when calling EntityManager.clear(), while Hibernate and EclipseLink do not (the transaction will stay open until explicitly committed or rolledback).

I noticed this when attempting to optimise the import speed. When calling ((EntityManagerImpl)em).getSession().clear(); instead, the performance import between all 3 JPA implementations seems to be in the same ballpark. When not calling clear() to perform bulk imports, Batoo is much quicker