CriteriaUpdate<Item> update =
                criteriaBuilder.createCriteriaUpdate(Item.class);
            Root<Item> i = update.from(Item.class);
            update.set(
                i.get(Item_.active),
                true
            );
            update.set(
                i.get(Item_.name),
                "Foo"
            );

            int updatedEntities = em.createQuery(update).executeUpdate();

update Item as generatedAlias0 set generatedAlias0.active = :param0generatedAlias0.name = :param1, 

	private void renderAssignments(StringBuilder jpaql, RenderingContext renderingContext) {
		jpaql.append( " set " );
		boolean first = true;
		for ( Assignment assignment : assignments ) {
			jpaql.append( assignment.attributePath.render( renderingContext ) )
					.append( " = " )
					.append( assignment.value.render( renderingContext ) );
			if ( ! first ) {
				jpaql.append( ", " );
			} // FIX THIS!
			first = false;
		}
	}