public T send() throws IOException {
        return web3jService.send(this, responseType);
    }
@Test
    public void testEthGetBlockByNumber() throws Exception {
        web3j.ethGetBlockByNumber(DefaultBlockParameter.valueOf(Numeric.toBigInt("0x1b4")), true)
                .send();

        verifyResult(
                "{\"jsonrpc\":\"2.0\",\"method\":\"eth_getBlockByNumber\","
                        + "\"params\":[\"0x1b4\",true],\"id\":1}");
    }