2016-07-22 23:01:26,237	DEBUG org.hibernate.SQL	- insert into Thing (id) values (null)
2016-07-22 23:01:26,261	DEBUG org.hibernate.SQL	- insert into SomeEntity (id, lastChangedAt, parent_id, version) values (null, ?, ?, ?)
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 4 sec <<< FAILURE!
test(eu.pinske.test.ThingTest)  Time elapsed: 3.782 sec  <<< ERROR!
java.lang.ClassCastException: java.util.HashSet cannot be cast to org.hibernate.collection.spi.PersistentCollection
	at org.hibernate.event.internal.FlushVisitor.processCollection(FlushVisitor.java:39)
	at org.hibernate.event.internal.AbstractVisitor.processValue(AbstractVisitor.java:104)
	at org.hibernate.event.internal.AbstractVisitor.processValue(AbstractVisitor.java:65)
	at org.hibernate.event.internal.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:59)
	at org.hibernate.event.internal.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:155)
	at org.hibernate.event.internal.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:216)
	at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:85)
	at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:38)
	at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1397)
	at eu.pinske.test.ThingTest.test(ThingTest.java:30)