Here is an interesting approach to get deep object graphs effectively.  This will ensure that you will get all the relevant collections without having to lazy load them and without a huge cartesian product. Especially useful if you want to load a collection of items with the associated deep object graph.

public Policy GetPolicyEagerly(int policyId)
{
	IList list = ActiveRecordUnitOfWorkFactory.CurrentSession.CreateMultiQuery()
		.Add(@"from Policy policy left join fetch policy.PolicyLeadAssociations
                                  where policy.Id = :policyId")
		.Add(@"from Policy policy left join fetch policy.PolicyEmployeeAssociations
                                  where policy.Id = :policyId")
		.Add(@"from Policy policy left join fetch policy.PolicyManagerAssociations
                                  where policy.Id = :policyId")
		.Add(@"from Policy policy left join fetch policy.PolicyDepartmentAssociations
                                  where policy.Id = :policyId")
		.Add(@"from Policy policy left join fetch policy.PolicyCustomerAssociations
                                  where policy.Id = :policyId")
		.SetEntity("policy", Policy)
		.List();
	IList firstResultList = (IList) list[0];
	if(firstResultList.Count==0)
		return null;
	return = (Policy) firstResultList [0];
}

The domain above is a fake one, by the way, don't try to make any sense of it.