Duplicate key errors when testing with Java 8

More failures when running with Java 8. These failures are intermittent. They seem to depend on whether I am running the full openjpa bucket (mvn test from the top level directory), or whether I am running just from the openjpa-persistence-jdbc directory level.

Tests in error:
testConcurrentMap001(org.apache.openjpa.persistence.relations.TestConcurrentMap)
testDeleteIsDetectedOnCleanRefreshWithLockWithDataCache(org.apache.openjpa.persistence.datacache.TestDataCacheBehavesIdentical)
testDeleteIsDetectedOnDirtyRefreshWithLockWithDataCache(org.apache.openjpa.persistence.datacache.TestDataCacheBehavesIdentical)
testCleanRefreshWithNoLockDoesNotHitDatabase(org.apache.openjpa.persistence.datacache.TestDataCacheBehavesIdentical)
testCleanRefreshWithReadLockDoesNotHitDatabase(org.apache.openjpa.persistence.datacache.TestDataCacheBehavesIdentical)
testDirtyRefreshWithWriteLockHitsDatabase(org.apache.openjpa.persistence.datacache.TestDataCacheBehavesIdentical)
testCleanRefreshWithWriteLockDoesNotHitDatabase(org.apache.openjpa.persistence.datacache.TestDataCacheBehavesIdentical)
testDeleteIsDetectedOnDirtyRefreshWitDataCache(org.apache.openjpa.persistence.datacache.TestDataCacheBehavesIdentical)

If I look at a couple of the surefire reports, I see some duplicate key exceptions. Again, not sure why the use of Java 8 is affecting this processing...