code: public void resume(Transaction tx) {
  		try {
  			if ( tx != null ) {
  				tm.resume( tx );
  			}
  		}
  		catch (Exception e) {
  			throw log.cannotResumeTx( e );
  		}
  	}
docs: Tell the TransactionManager to resume the given transaction
  
  @param tx the transaction to suspend. May be <code>null</code>.