title: Is it possible to override persistence.xml properties via configuration?
body: <p>JBOSS 5.1 / EJB 3 / JPA / MySQL</p>
  
  <p>For development we specify "hibernate.hbm2ddl.auto" as "update". This is done in several persistence.xml files embedded in several jars in an ear.</p>
  
  <p>For production we'd like to override this to specify "validate".</p>
  
  <p>Can this be done via configuration external to the ear?</p>
  
  <p>(I know it's possible to do this in code in a non-managed environment)</p>