public T send() throws IOException {
        return web3jService.send(this, responseType);
    }
@Test
    public void testEthGetCode() throws Exception {
        web3j.ethGetCode(
                        "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b",
                        DefaultBlockParameter.valueOf(Numeric.toBigInt("0x2")))
                .send();

        verifyResult(
                "{\"jsonrpc\":\"2.0\",\"method\":\"eth_getCode\","
                        + "\"params\":[\"0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b\",\"0x2\"],\"id\":1}");
    }