OPENJPA-2489.  Committing patch as provided by Romain Manni-Bucau.   This patch just modifies the testcase to skip attempting to process some new Java 8 methods that are not needed yet...

git-svn-id: https://svn.apache.org/repos/asf/openjpa/trunk@1588978 13f79535-47bb-0310-9956-ffa450edef68