File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Object Relational Mapping and the fly likes hibernate problem, what to try next? Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Databases » Object Relational Mapping
Bookmark "hibernate problem, what to try next?" Watch "hibernate problem, what to try next?" New topic

hibernate problem, what to try next?

john guthrie
Ranch Hand

Joined: Aug 05, 2002
Posts: 124
having a first go at hibernate (with xdoclet), and i've gotten to a point where i get an error and don't know how to proceed. the error looks like this:
[java] (cfg.Environment 519 ) using CGLIB reflection optimizer
[java] (cfg.Configuration 347 ) Mapping resource: org/me/hibernate/HClubber.hbm.xml
[java] (cfg.Binder 229 ) Mapping class: -> clubbers
[java] (cfg.Configuration 613 ) processing one-to-many association mappings
[java] net.sf.hibernate.MappingException: Association references unmapped class:

so it looks to me like one of three problems:
1) cannot find class in classpath
2) cannot find hibernate config HClubberComment.hbm.xml in classpath
3) my mapping is set up incorrectly

1 and 2 i can safely dismiss. if i list the class files (and 'classes' is on my classpath):
[jimmer@localhost bookclub]$ ls classes/org/jimmer/bookclub/hibernate/
HClubber.class HClubber.hbm.xml HClubberComment.class HClubberComment.hbm.xml

so, my mapping... i've got a one-to-many relationship between 'clubber' and 'comments'. tables are straightforward (postgresql backend btw). the two classes are annotated as:


the xdoclet-generated files read, in part.



now, i don't pretend to know what all these attributes mean, but this looks pretty okay to me, based on other examples i've seen.

so, can anyone see anything wrong here? more importantly, what i can i do to futher debug this? thanks.
Paul Sturrock

Joined: Apr 14, 2004
Posts: 10336

It's not the classpath and it's (probably) not your mappings. What it looks like is you have not loaded HClubberComment into the SessionFactory via your Configuration. Make sure it is included in hibernate.cfg.xml, if you are configuring hibernate that way, or that you have added it to your configurationg manually if you are doing it that way.

JavaRanch FAQ HowToAskQuestionsOnJavaRanch
john guthrie
Ranch Hand

Joined: Aug 05, 2002
Posts: 124
i sure haven't - thanks! (!!!)


Joined: Nov 06, 2006
Posts: 1
It helps me too, thanks!
David O'Meara

Joined: Mar 06, 2001
Posts: 13459

Welcome to the JavaRanch.

We're a friendly group, but we do require members to have valid display names.

Display names must be two words: your first name, a space, then your last name. Fictitious names are not allowed.

Please edit your profile and correct your display name since accounts with display names get deleted, often without warning

I agree. Here's the link:
subject: hibernate problem, what to try next?
It's not a secret anymore!