This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Although not mentioned explicitly on the exam page, it can be inferred from the exam title (which mentions EE 6), that the JPA version it focuses on is 2.0. This page lists JPA 2.0 as an EE 6 technology, while this page lists JPA 2.1 as an EE 7 technology.