### Question:
TransactionExtensionStore extends OracleStore { public static TransactionExtensionStore getInstance() { return instance; } private  TransactionExtensionStore(); static TransactionExtensionStore getInstance();  }### Answer:
@Test public void putData() { byte[] key = ByteArray.fromString("aa"); byte[] value = ByteArray.fromString("mmmmm"); TransactionExtensionStore store = TransactionExtensionStore.getInstance(); store.closeDB(); store.initDB(); store.putData(key, value); Assert.assertArrayEquals(store.getData(key), value); }