public T send() throws IOException {
        return web3jService.send(this, responseType);
    }
@Test
    public void testDbPutHex() throws Exception {
        web3j.dbPutHex("testDB", "myKey", "0x68656c6c6f20776f726c64").send();

        verifyResult(
                "{\"jsonrpc\":\"2.0\",\"method\":\"db_putHex\","
                        + "\"params\":[\"testDB\",\"myKey\",\"0x68656c6c6f20776f726c64\"],\"id\":1}");
    }