code: public static DataSource initializeTxSimple(DataSource dataSource) {
        TxTransactionManager txManager = new TxTransactionManager(dataSource);
        return initializeTxCustom(txManager.getTxDataSource(), txManager, txManager);
     }
docs: Use this one to use simple embedded {@link TransactionManager} implementation for tx handling.
  
  @param dataSource the {@link DataSource} to use by the default
  @return dataSource that will be used for queries