Closing issue which has been resolved for some time. If you believe the issue is not resolved please reopen or open a new issue.
r1027977 in trunk
Same issue as described in parent JIRA OPENJPA-1300 and as further described in OPENJPA-1319. Providing patch OPENJPA-1313-trunk.patch. I added code to safe guard against the potential of nulls being used in the hashCode and/or equals methods, thus avoiding any potential NullPointerExceptions.