上载文件-DocumentList.java示例出现“需要授权”错误

我正试图将一个文件从我的桌面上传到谷歌硬盘。我在谷歌提供的DocumentList.java示例中给出了CLIENT_ID和CLIENT_SECRET。当我作为java应用程序运行时，我得到以下错误：

return service.insertbuildUrlUrlUrl\u DEFAULT+URL\u DOCLIST\u提要，newDocument

代码：

错误：

com.google.gdata.util.AuthenticationException: Authorization required
    at com.google.gdata.client.http.HttpGDataRequest.handleErrorResponse(HttpGDataRequest.java:608)
    at com.google.gdata.client.http.GoogleGDataRequest.handleErrorResponse(GoogleGDataRequest.java:564)
    at com.google.gdata.client.http.HttpGDataRequest.checkResponse(HttpGDataRequest.java:560)
    at com.google.gdata.client.http.HttpGDataRequest.execute(HttpGDataRequest.java:538)
    at com.google.gdata.client.http.GoogleGDataRequest.execute(GoogleGDataRequest.java:536)
    at com.google.gdata.client.media.MediaService.insert(MediaService.java:400)
    at com.DocumentList.uploadFile(DocumentList.java:538)
    at com.DocumentList.login(DocumentList.java:230)
    at com.DocumentList.main(DocumentList.java:546)

com.google.gdata.util.AuthenticationException: Authorization required
    at com.google.gdata.client.http.HttpGDataRequest.handleErrorResponse(HttpGDataRequest.java:608)
    at com.google.gdata.client.http.GoogleGDataRequest.handleErrorResponse(GoogleGDataRequest.java:564)
    at com.google.gdata.client.http.HttpGDataRequest.checkResponse(HttpGDataRequest.java:560)
    at com.google.gdata.client.http.HttpGDataRequest.execute(HttpGDataRequest.java:538)
    at com.google.gdata.client.http.GoogleGDataRequest.execute(GoogleGDataRequest.java:536)
    at com.google.gdata.client.media.MediaService.insert(MediaService.java:400)
    at com.DocumentList.uploadFile(DocumentList.java:538)
    at com.DocumentList.login(DocumentList.java:230)
    at com.DocumentList.main(DocumentList.java:546)