AppEngine 在尝试连接到 Google Cloud MySql 实例时出现“通信链路故障”错误

Question

I have a Java/Jetty based appengine project that successfully connects to Google cloud MySql server when using TCP connection with JDBC, BUT fails to connect to the same server when trying to make it through Instance name and JDBC socketFactory. the error I am getting in the GCP debug console:

"Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The >driver has not received any packets from the server."

try {
            Class.forName("com.mysql.jdbc.GoogleDriver");
            String url= String.format("jdbc:google:mysql:///"
                    + "MY_DB_NAME" + "?"
                    + "cloudSqlInstance=%s&"
                    + "socketFactory=%s&"
                    + "useSSL=false",
                    "PROJECT-ID:ZONE:INSTANCE_NAME", 
                    "com.google.cloud.sql.mysql.SocketFactory");

            return DriverManager.getConnection(url, USER_NAME, USER_PASSWORD);
        } catch (SQLException | ClassNotFoundException e) {
            e.printStackTrace();
            return null;
        }

Answer 1

The problem might be in the public IP address that you specify in the cloud mysql instance. Just check the public IP address by typing What is my public IP? in the browser. Then update the public IP given for the google cloud instance. This might be help to solve your issue.