将图像文件上传到Google云端存储后出现图像错误

Question

将图片上传到Google Cloud Store，但一旦将其部署到Google Cloud，就会出现以下错误：         - 错误：服务器错误         - 服务器遇到错误，无法完成您的请求。         - 请在30秒后重试。 谢谢你的帮助。

public class UploadfilesServlet extends HttpServlet {
        public static final String BUCKETNAME = "bucket_endpoints";
        public static final String FILENAME = "test.jpg";
        public void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws IOException {
            URL res = getClass().getResource("transform_before.jpg");
            File file = new File(res.getFile());
            //Create bFile with byte array
            byte[] bFile = new byte[(int) file.length()];
            FileInputStream fileInputStream=null;
            //convert file into array of bytes
            fileInputStream = new FileInputStream(file);
            fileInputStream.read(bFile);
            fileInputStream.close();


            FileService fileService = FileServiceFactory.getFileService();
            GSFileOptionsBuilder optionsBuilder = new GSFileOptionsBuilder()
               .setBucket(BUCKETNAME)
               .setKey(FILENAME)
               .setMimeType("image/jpeg")
               .setAcl("public-read")
               .addUserMetadata("myfield1", "my field value");
            AppEngineFile writableFile = fileService.createNewGSFile(optionsBuilder.build());
             boolean lock = true;
             FileWriteChannel writeChannel = fileService.openWriteChannel(writableFile, lock);
             writeChannel = fileService.openWriteChannel(writableFile, lock);

             writeChannel.write(ByteBuffer.wrap(bFile));


             // Now finalize
             writeChannel.closeFinally();
             resp.getWriter().println("Done writing...");

        }
    }