SocketTimeoutException Spring 4

Question

我正在使用带有tomcat 8的spring MVC 4.在上传文件时我收到以下错误。我已将会话配置为在一小时后过期。任何人都可以指导我正确的方向

Could not parse multipart servlet request; nested exception is java.io.IOException: org.apache.tomcat.util.http.fileupload.FileUploadBase$IOFileUploadException: Processing of multipart/form-data request failed. null] with root cause
 java.net.SocketTimeoutException
    at org.apache.tomcat.util.net.NioBlockingSelector.read(NioBlockingSelector.java:201)
    at org.apache.tomcat.util.net.NioSelectorPool.read(NioSelectorPool.java:235)
    at org.apache.tomcat.util.net.NioSelectorPool.read(NioSelectorPool.java:216)
    at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.fillReadBuffer(NioEndpoint.java:1233)
    at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.read(NioEndpoint.java:1182)
    at org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:708)
    at org.apache.coyote.http11.Http11InputBuffer.access$300(Http11InputBuffer.java:40)
    at org.apache.coyote.http11.Http11InputBuffer$SocketInputBuffer.doRead(Http11InputBuffer.java:1057)
    at org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:139) ...

在控制器中：

@PostMapping(value = "/uploadSurvey")
    @ResponseBody
public String uploadSurvey(@Valid FileBucket fileBucket, BindingResult result, HttpSession session) {

        if (result.hasErrors())
            return "redirect:/surveys/uploadSurvey";
        else {

            byte[] bytes;
            try {
                bytes = fileBucket.getFile().getBytes();
                String decoded = new String(bytes, "UTF-8");
                //Here I do object mapping using jackson
            }
            catch (Exception e){
                e.printStackTrace();
            }
         }
      return "xxx";
    }

在客户端我使用angularjs发送文件：

fd.append('file', file);
        fd.append($scope.csrfParamName, $scope.csrfToken);

        $http.post(uploadUrl, fd, {
            transformRequest : angular.identity,
            headers : {
                'Content-Type' : undefined
            }
        })