Is it valid for Hibernate list() to return duplicates?

Question

Is anyone aware of the validity of Hibernate\'s Criteria.list() and Query.list() methods returning multiple occurrences of the same entity?

Answer 1

I also started noticing this behavior in my Java API as it started to grow. Glad there is an easy way to prevent it. Out of practice I've started out appending:

.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY)

To all of my criteria that return a list. For example:

List paymentTypeAccounts = criteria()
  .setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY)
  .list();