public T send() throws IOException {
        return web3jService.send(this, responseType);
    }
@Test
    public void testEthGetTransactionReceipt() throws Exception {
        web3j.ethGetTransactionReceipt(
                        "0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238")
                .send();

        verifyResult(
                "{\"jsonrpc\":\"2.0\",\"method\":\"eth_getTransactionReceipt\",\"params\":["
                        + "\"0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238\"],"
                        + "\"id\":1}");
    }