public T send() throws IOException {
        return web3jService.send(this, responseType);
    }
@Test
    public void testEthNewFilter() throws Exception {
        EthFilter ethFilter = new EthFilter().addSingleTopic("0x12341234");

        web3j.ethNewFilter(ethFilter).send();

        verifyResult(
                "{\"jsonrpc\":\"2.0\",\"method\":\"eth_newFilter\","
                        + "\"params\":[{\"topics\":[\"0x12341234\"]}],\"id\":1}");
    }