I have derived my own dialect class from Hibernate's InformixDialect class in order to register two missing mappings (see Thomas Much's Weblog for details: http://www.snailshell.de/blog/archives/cat_java.html). However, JBoss is giving me the following error when I deploy my application's EAR file:

javax.persistence.PersistenceException: org.hibernate.HibernateException: Dialect class not found: org.hibernate.dialect.Informix10Dialect

I have tried putting this new dialect class in several places with no success. I have added it to my EAR's lib folder, I have created a separate JAR with just this new class in it and placed it in JBoss's server/default/lib folder, and I have added it to JBoss's hibernate3.jar file in the server/default/lib folder. None of these resolve the problem of JBoss not being able to find my derived dialect class.

Any ideas on what I am doing wrong?