Hibernate: Safely reattach an object to the session

I'm maintaining a cache of objects across hibernate sessions by storing (possibly-detached) objects in a map. When the cache gets a hit, I test if the object is already part of the session with `Session.contains(object)`. If not, I re-attach it with `Session.lock(object, LockMode.NONE)`. The problem is, if the same object was loaded previously in the session, it throws a org.hibernate.NonUniqueObjectException. Given a detached instance, I see no way to find out in advance if this exception will get thrown, without possibly hitting the database. There are a couple workarounds:
  1. Reattach all cached objects at the start of every transaction.
  2. Catch the NonUniqueObjectException and then call session.load(object.class, object.getId());
Neither of these are as clean as checking the session in advance for an object class + id. Is there any way to do that?

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