1. Create parent class
2. Create it's subclass
3. run new hibernate mapping wizard
4. create console configuration based on the generated files
5. open session factory:
Observe the exception below

org.hibernate.MappingException: No discriminator found for com.pnx.model.hibernate.Person. Discriminator is needed when 'single-table-per-hierarchy' is used and a class has subclasses
at org.hibernate.mapping.SingleTableSubclass.validate(SingleTableSubclass.java:64)
at org.hibernate.cfg.Configuration.validate(Configuration.java:1149)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1334)
at org.hibernate.console.ConsoleConfiguration$4.execute(ConsoleConfiguration.java:554)
at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:63)
at org.hibernate.console.ConsoleConfiguration.execute(ConsoleConfiguration.java:98)
at org.hibernate.console.ConsoleConfiguration.buildSessionFactory(ConsoleConfiguration.java:549)
at org.hibernate.eclipse.console.workbench.LazySessionFactoryAdapter.getChildren(LazySessionFactoryAdapter.java:43)
at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.getChildren(BasicWorkbenchAdapter.java:100)
at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.fetchDeferredChildren(BasicWorkbenchAdapter.java:106)
at org.eclipse.ui.progress.DeferredTreeContentManager$1.run(DeferredTreeContentManager.java:234)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)