codename one push notification meet error "javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure" - ssl

Question

We have a web project which is always working fine, it just using codename one push api to push notification to our devices, but it suddenly get the following error:
javax.net.ssl.SSLHandshakeException: Received fatal alert:
handshake_failure
Below is the core code (same with codenamoe one demo)
HttpURLConnection connection = (HttpURLConnection)new URL("https://push.codenameone.com/push/push").openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
String cert = ITUNES_DEVELOPMENT_PUSH_CERT;
String pass = ITUNES_DEVELOPMENT_PUSH_CERT_PASSWORD;
if(ITUNES_PRODUCTION_PUSH) {
cert = ITUNES_PRODUCTION_PUSH_CERT;
pass = ITUNES_PRODUCTION_PUSH_CERT_PASSWORD;
}
String query = "token=" + PUSH_TOKEN +
"&device=" + URLEncoder.encode(deviceId1, "UTF-8") +
"&device=" + URLEncoder.encode(deviceId2, "UTF-8") +
"&device=" + URLEncoder.encode(deviceId3, "UTF-8") +
"&type=1" +
"&auth=" + URLEncoder.encode(FCM_SERVER_API_KEY, "UTF-8") +
"&certPassword=" + URLEncoder.encode(pass, "UTF-8") +
"&cert=" + URLEncoder.encode(cert, "UTF-8") +
"&body=" + URLEncoder.encode(MESSAGE_BODY, "UTF-8") +
"&production=" + ITUNES_PRODUCTION_PUSH +
"&sid=" + URLEncoder.encode(WNS_SID, "UTF-8") +
"&client_secret=" + URLEncoder.encode(WNS_CLIENT_SECRET, "UTF-8");
try (OutputStream output = connection.getOutputStream()) {
output.write(query.getBytes("UTF-8"));
}
int c = connection.getResponseCode();
// read response JSON
I directly run the code in unit test, it works well.
But when I call the function from project (such as a button from webpage), the error happened.
I tried several way to solve it but still can not work, please give me some suggestion to fix the issue. Thank you!

Answer 1

This generally happens if the certificate is invalid or out of date etc. It can happen if your connection. I just verified our SSL certificate on the push servers and it's valid (generated by cloudflare) so I suggest checking the routes to the server and your version of Java. You should have Java 8 or newer with a recent enough minor update version.