code: @Override
      public final DataSource getJtaDataSource() {
          if (ivJtaDataSource == null || ivJtaDataSource instanceof GenericDataSource) { // d455055
              ivJtaDataSource = getJPADataSource(ivJtaDataSourceJNDIName);
          }
          return ivJtaDataSource;
      }
docs: (non-Javadoc)
  
  @see javax.persistence.spi.PersistenceUnitInfo#getJtaDataSource()