[hibernate-dev] SessionImpl.list(CriteriaImpl criteria) returns an empty list when no implementors exist

Kevin Wong siliconvalleykevin at gmail.com
Tue Feb 17 13:57:11 EST 2009

Hi Steve, thanks for the idea. Thoughts on returning null instead of an empty list to differentiate an unsuccessful query versus a successful query that returns no items.


----- Original Message -----
From: "Steve Ebersole" <steve at hibernate.org>
To: "Kevin Wong" <siliconvalleykevin at gmail.com>
Cc: hibernate-dev at lists.jboss.org
Sent: Monday, February 16, 2009 7:18:23 AM GMT -08:00 US/Canada Pacific
Subject: Re: [hibernate-dev] SessionImpl.list(CriteriaImpl criteria) returns an empty list when no implementors exist

We could perhaps log.warn like we do for HQL, but throwing an exception
is not a good idea imo.

Steve Ebersole
Project Lead
steve at hibernate.org

Principal Software Engineer
JBoss, a division of Red Hat
steve.ebersole at jboss.com
steve.ebersole at redhat.com

On Sat, 2009-02-14 at 09:29 -0800, Kevin Wong wrote:
> Hi all, in using hibernate v31final SessionImpl.list(CriteriaImpl criteria), I had an issue where hibernate would return an empty list when no implementors existed for the entity name(I had mistaken deleted the entity from the hibernation configuration file). The confusion arose in that this was be mistaken for a query that would return no rows. In looking at the code, it appears that the results list is always initialized to an empty list rather than null. Likewise, no exception is thrown if the entity does not exists, whereas when using HQL an org.hibernate.hql.ast.QuerySyntaxException exception would be thrown. Opinions on initializing the results list to null or throwing an exception if the implementators exist for the desired entity?
> Thanks
> Kevin
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