public T send() throws IOException {
        return web3jService.send(this, responseType);
    }
@Test
    public void testDbGetString() throws Exception {
        web3j.dbGetString("testDB", "myKey").send();

        verifyResult(
                "{\"jsonrpc\":\"2.0\",\"method\":\"db_getString\","
                        + "\"params\":[\"testDB\",\"myKey\"],\"id\":1}");
    }