RootClass.discriminator value used to determine discriminator type and columns when table-pre-type-hierarchy used in mapping, but element discriminator never exported and sessionFactory can't be built for such configuration:

org.hibernate.MappingException: No discriminator found for com.jboss.dvd.seam.Admin. Discriminator is needed when 'single-table-per-hierarchy' is used and a class has subclasses

org.hibernate.MappingException: No discriminator found for com.jboss.dvd.seam.Admin. Discriminator is needed when 'single-table-per-hierarchy' is used and a class has subclasses
at org.hibernate.mapping.SingleTableSubclass.validate(SingleTableSubclass.java:41)
at org.hibernate.cfg.Configuration.validate(Configuration.java:1102)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1287)
at org.hibernate.console.ConsoleConfiguration$3.execute(ConsoleConfiguration.java:502)
at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:64)
at org.hibernate.console.ConsoleConfiguration.execute(ConsoleConfiguration.java:95)
at org.hibernate.console.ConsoleConfiguration.buildSessionFactory(ConsoleConfiguration.java:497)
...