Java MongoDB:状态应为：w是整数

我正在尝试编写REST web服务以获取MongoClient的对象。
我的REST web服务如下所示：

@SuppressWarnings({ "rawtypes", "unchecked", "deprecation" })
    @RequestMapping(path = "/testMongo", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON)
    @ResponseBody
    public MongoClient testCredentials(@RequestBody MongoConnect mongoConnect) {

    LOGGER.info("MongoController:: testCredentials()::start");

    String ipAddress = "";
    Integer port = 0;
    String username = "";
    String password = "";
    String result = "";
    MongoClient mongo = null;
    MongoCredential mongoCredential = null;
    String dbName = "admin";
    MongoConnectResponse mongoConnectResponse = new MongoConnectResponse();

    try {
        if (mongoConnect != null) {
            ipAddress = mongoConnect.getIpAddress();
            port = mongoConnect.getPort();
            username = mongoConnect.getUsername();
            password = mongoConnect.getPassword();

            if ((username == null || username.equalsIgnoreCase(MongoConstants.EMPTY_STRING))
                    && (password == null || password.equalsIgnoreCase(MongoConstants.EMPTY_STRING))) {
                mongo = new MongoClient(ipAddress, port);

            } else {
                mongoCredential = MongoCredential.createScramSha1Credential(username, dbName,
                        password.toCharArray());
                mongo = new MongoClient(new ServerAddress(ipAddress, port), Arrays.asList(mongoCredential));
            }

            DB db = mongo.getDB(dbName);
            db.getCollectionNames();

            result = MongoConstants.SUCCESS;


        } else {
            result = MongoConstants.INVALID_REQUEST;
        }

        LOGGER.info("MongoController:: testCredentials()::end");

    } catch (Throwable e) {

        if (e.getMessage().contains(MongoConstants.AUTHENTICATION_FAILED)) {
            result = MongoConstants.AUTHENTICATION_FAILED;
        } else if (e.getMessage().contains(MongoConstants.NOT_AUTHORIZED)) {
            result = MongoConstants.USERNAME_PWD_REQD;
        } else if (e.getMessage().contains(MongoConstants.TIMED_OUT)) {
            result = MongoConstants.NO_SERVER_FOUND + ipAddress + MongoConstants.PORT + port;
        } else {
            result = e.getMessage() + MongoConstants.CAUSE + e.getLocalizedMessage();
            e.printStackTrace();
        }
        LOGGER.info("MongoController:: testCredentials()::end");
    } 


    return mongo;

    //}

}

然而，当我试图通过邮递员对其进行测试时，我得到了以下响应：

{ “时间戳”：1508136268005， “地位”：500， “错误”：“内部服务器错误”， “异常”：“org.springframework.http.converter.HttpMessageNotWritableException”， “消息”：“无法写入内容：状态应为：w为整数（通过引用链：com.mongodb.MongoClient[\“writeConcern\”]->com.mongodb.writeConcern[\“w\”）；嵌套异常为com.fasterxml.jackson.databind.JsonMappingException：状态应为：w为整数（通过引用链：com.mongodb.MongoClient[\“writeConcern\”）->com.mongodb.WriteConcern[\“w\”]）“， “路径”：“/testMongo” }

---

请帮忙。

我只是猜测一下，但您的用户名或密码中是否有“w:”@dnickless，用户名是“admin”，密码是“password”，听起来像是驱动程序不兼容问题：尝试将所有库更新为匹配的版本！我只是在这里猜测，但您的用户名或密码中是否有“w:”@dnickless，用户名是“admin”，密码是“password”，听起来像是驱动程序不兼容问题：尝试将所有库更新为匹配版本！