I'm trying to perform a bulk update with JPA 2.1 CriteriaUpdate in Hibernate 4.3.0.GA, but have not found how to set a field to null.

The code is structured like this - I'd like to set a nullable field back to null.

CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaUpdate<User> q = cb.createCriteriaUpdate(User.class);
Address nullAddress = null;
q.set(PushUser_.altAddress, nullAddress);
Root<User> userRoot = q.from(User.class);
q.where(userRoot.get(User_.userId).in(userIdList));
int count = em.createQuery(q).executeUpdate();

I get this exception from the q.set() call setting null:
Exception in thread "Thread-1" java.lang.NullPointerException
at org.hibernate.jpa.criteria.CriteriaUpdateImpl.set(CriteriaUpdateImpl.java:87)

What's the correct way to do this?

CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaUpdate<User> q = cb.createCriteriaUpdate(User.class);
Expression<Address> nullAddress = cb.nullLiteral(Address.class);
q.set(PushUser_.altAddress, nullAddress);
Root<User> userRoot = q.from(User.class);
q.where(userRoot.get(User_.userId).in(userIdList));
int count = em.createQuery(q).executeUpdate();