postForObject方法调用错误，报400 bad request

[纵一苇就是我]

我在自己的程序中调用别人的服务中restful api，调用方式的POST，用了rRestTemplate的postForObject方法，但是总是报

POST request for "http://192.168.1.91:8030/moc/task/distribute" resulted in 400 (Bad Request); invoking error handler

2017-08-10 11:23:38.169 ERROR 18144 ---
[nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] :
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception
[Request processing failed; nested exception is org.springframework.web.client.HttpClientErrorException: 400 Bad Request] with root cause
org.springframework.web.client.HttpClientErrorException: 400 Bad Request

我的调用代码片段如下，请大家帮忙看看：

       //MOC接口的地址http://{domain}:{port}/moc/task/distribute
       String mocTaskDistributeUrl = "http://192.168.1.91:8030/moc/task/distribute";
        DeliverChangeParameter[] deliveringChanges = getRequestBody(deliveringChangeId, deliveringHostIp);

        //接收MOC的返回消息

        //为rest请求准备请求体
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        HttpEntity<DeliverChangeParameter[]> httpEntity = new HttpEntity<DeliverChangeParameter[]>(deliveringChanges);

        //发送请求
        UpdateResult updateResult = new UpdateResult();
        updateResult = restTemplate.postForObject(mocTaskDistributeUrl, httpEntity, UpdateResult.class);