ion context.  TxType.REQUIRED is the default.     </p>

 <p>By default checked exceptions do not result in the transactional interceptor marking the
 transaction for rollback and instances of RuntimeException and its  subclasses do. This default
 behavior can be modified by specifying exceptions that result in the interceptor marking the
 transaction for rollback and/or exceptions that do not result in rollback.</p>
 <p>The rollbackOn element can be set to indicate exceptions that must cause the interceptor