在Google AppEngine JAVA SDK1.9.50中创建HTTP请求时平台方法缺少警告

我使用以下JAVA代码发出URL请求

URL urlObj = new URL( urlStr );
HttpURLConnection httpConn = (HttpURLConnection)urlObj.openConnection();
httpConn.setDoOutput(true);
httpConn.setRequestMethod("GET");

int statusCode = httpConn.getResponseCode();
if ( statusCode != HttpURLConnection.HTTP_OK ) {
    logger.severe( "Error in opening url:" + urlStr );
    return;
}

bufferReader = new BufferedReader ( new InputStreamReader( httpConn.getInputStream(), "UTF-8" ) );
String line = null;
while ((line = bufferReader.readLine()) != null) {
        logger.info( line );
}

它在谷歌应用程序引擎上运行，在appengine sdk 1.9.49上没有任何问题。 但是当我升级到1.9.50时，它会返回以下警告

[INFO] 3月 11, 2017 12:04:51 下午 com.google.appengine.repackaged.com.google.protobuf.UnsafeUtil supportsUnsafeByteBufferOperations
[INFO] 警告: platform method missing - proto runtime falling back to safer methods: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "accessClassInPackage.sun.misc")
[INFO] 3月 11, 2017 12:04:51 下午 com.google.appengine.repackaged.com.google.protobuf.UnsafeUtil.supportsUnsafeArrayOperations
[INFO] 警告: platform method missing - proto runtime falling back to safer methods: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "accessClassInPackage.sun.misc")
[INFO] 3月 11, 2017 12:04:51 下午 com.google.appengine.repackaged.com.google.protobuf.UnsafeUtil.supportsUnsafeCopyMemory
[INFO] 警告: copyMemory is missing from platform - proto runtime falling back to safer methods.

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我需要采取什么行动，还是忽略它？Thx当前版本为。您应该检查问题是否在1.9.52中持续存在，如果持续存在，您应该提交一份报告供我们查看。您已经注意到了软件中所谓的回归，即在版本发布之间对功能的更改，在这些版本中以前有效的东西不再有效

在49版和50版中都会发生在我身上。它显示在响应中未找到404错误。