http://opensource.atlassian.com/projects/hibernate/browse/ANN-841

This bug causes the following tests in org.hibernate.test.annotations.indexcoll.IndexedCollectionTest tests to fail using mysql5:
testDefaultMapKey
testMapKeyToEntity
testComponentSubPropertyMapKey
testMapKeyEntityEntity
due to:
"Cannot add or update a child row: a foreign key constraint fails (`test1/AddressEntry`, CONSTRAINT `FK181B28FE1355AC4A` FOREIGN KEY (`firstname`, `lastname`) REFERENCES `AddressEntry` (`firstname`, `lastname`))"

The failures were due to a bug MySQL has with self-referencing foreign keys.