code: public void rollbackBean(ContainerTx tx, BeanO bean)
      {
          bean.getActivationStrategy().atRollback(tx, bean);
      }
docs: Perform rollback-time processing for the specified transaction and
  bean. This method should be called for each bean which was
  participating in a transaction which was rolled back.
  
  Removes the transaction-local instance from the cache.
  
  @param tx The transaction which was just rolled back
  @param bean The bean for rollback processing