sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

[Shachar Grembek]

Hi,

I am using App Engine java 8 that exposes a few HTTPS GET API's. When I test my API from the browser it works perfectly, but when I create a java client from code that calls the API I receive an exception:
" sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"

I don't know why am I receiving the exception as I have yet set any security measures and more surprisingly, the call works fine with my browser. 

This is the code I am using for the java client:
Any ideas why is it happening?

URL myUrl = new URL(httpsURL);
HttpsURLConnection conn = (HttpsURLConnection) myUrl.openConnection();
conn.setRequestMethod("GET");
InputStream is = conn.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);

String inputLine;

while ((inputLine = br.readLine()) != null) {
    System.out.println(inputLine);
}

br.close();

[Kenworth (Google Cloud Platform)]

This seems to be a dated known issue about the need to generate the certificates. You can find one of the blogs here. 

For further assistance I would recommend posting a question to StackOverflow (which we also monitor), as this falls outside the scope of Google Groups which is not meant for specific 1-on-1 technical issues but for general discussion of the platform and its services. Check out our community support page for the list of tags we monitor.