title: Testing EJB2.1 to EJB3 migration
body: <p>We would like to migrate an application written using EJB2.1 beans (both Entity and Sessions beans) to EJB3 to improve on maintanance and use new features in the EJB3 spec.</p>
  
  <p>How would we do the migration and give the users the guarantee (if any) that the migrated system still works just as the old one. The original app didn't have test cases.</p>