java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
at java.util.HashMap$KeyIterator.next(HashMap.java:845)
at org.hibernate.collection.internal.AbstractPersistentCollection$IteratorProxy.next(AbstractPersistentCollection.java:795)
at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:412)
at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:353)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:329)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)
at org.hibernate.event.internal.DefaultDeleteEventListener.cascadeBeforeDelete(DefaultDeleteEventListener.java:324)
at org.hibernate.event.internal.DefaultDeleteEventListener.deleteEntity(DefaultDeleteEventListener.java:263)
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