用户获取消息接口返回500错误

某一个用户调用JMessageClient的getUserMessages接口获取消息出错，返回500错误，其他用户没事。返回错误如下：

```
Error response from JPush server. Should review and fix it. {}
HTTP Status: 500
Error Message:

HTTP ERROR: 500

Problem accessing /v2/users/eebd8bff18ac4a3e8261da4ac4b789c2/messages. Reason:

    org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.RuntimeException: java.util.concurrent.TimeoutException