public T send() throws IOException {
        return web3jService.send(this, responseType);
    }
@Test
    public void testEthGetBalance() throws Exception {
        web3j.ethGetBalance(
                        "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
                        DefaultBlockParameterName.LATEST)
                .send();

        verifyResult(
                "{\"jsonrpc\":\"2.0\",\"method\":\"eth_getBalance\","
                        + "\"params\":[\"0x407d73d8a49eeb85d32cf465507dd71d507100c1\",\"latest\"],"
                        + "\"id\":1}");
    }