getter (for many-to-one) did not work with an interface as return values ------------------------------------------------------------------------- Key: HHH-2212 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2212 Project: Hibernate3 Type: Improvement Environment: java 5.0, eclipse jboss ide, oracle 9i on xp , classes12.jar jdbc diver Reporter: Manfred Quasten Attachments: Configuration.jdo.xml, Document.java, DocumentConfiguration.java the getter Method for a many-to-one Method can not have an Interface as returntype : ( ConfigurationImpl implements the interface DocumentConfiguration ) The first opportunity works, the second one not : ... public ConfigurationImpl getConfiguration() { return (ConfigurationImpl) configuration; } ... public DocumentConfiguration getConfiguration() { return configuration; } This is bad, because it is not possible to work against an interface and to change the implementation (testmocks etc ) (using dependency injection for example) I think the real returned type should be taken for the mapping not the signature of the method. If the signature of the method is an interface that it implemented by the returned class it should work too . The error message for the second case : Exception in thread "main" org.hibernate.MappingException: An association from the table xDocument refers to an unmapped class: de.mq.fourier.server.document.DocumentConfiguration at org.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:1134) at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1052) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1168) at de.mq.fourier.server.document.dao.ConfigurationHibernateDAO.<init>(ConfigurationHibernateDAO.java:18) at de.mq.fourier.server.document.dao.ConfigurationHibernateDAO.main(ConfigurationHibernateDAO.java:73) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira