_ds = ds;
initTxMgr(txFactoryClassName);
HashMap<String, Object> propMap = new HashMap<String,Object>();
propMap.put("openjpa.Log", "commons");
propMap.put("openjpa.ManagedRuntime", new JpaTxMgrProvider(_txMgr));
propMap.put("openjpa.ConnectionFactory", _ds);
propMap.put("openjpa.ConnectionFactoryMode", "managed");
propMap.put("openjpa.FlushBeforeQueries", "true");
//propMap.put("openjpa.FetchBatchSize", 1000);
propMap.put("openjpa.jdbc.TransactionIsolation", "read-committed");