try {
                Class.forName("com.mysql.cj.jdbc.Driver");
                conn = DriverManager.getConnection("jdbc:mysql://XXX.XX.XXX.XXX:3306/androidapp","XXX", "XXXXX");
                }

01-21 22:53:48.713 5823-5946/com.stellaris.practice E/AndroidRuntime: FATAL EXCEPTION: Thread-5
    Process: com.stellaris.practice, PID: 5823
    java.lang.UnsupportedOperationException
        at java.util.regex.Matcher.group(Matcher.java:383)
        at com.mysql.cj.conf.ConnectionUrlParser.isConnectionStringSupported(ConnectionUrlParser.java:152)
        at com.mysql.cj.conf.ConnectionUrl.acceptsUrl(ConnectionUrl.java:258)
        at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:195)
        at java.sql.DriverManager.getConnection(DriverManager.java:569)
        at java.sql.DriverManager.getConnection(DriverManager.java:219)
        at com.stellaris.functions.DBUtils.getConnection(DBUtils.java:21)
        at com.stellaris.functions.DBUtils.getUserInfoByName(DBUtils.java:33)
        at com.stellaris.practice.LoginActivity$2.run(LoginActivity.java:91)
        at java.lang.Thread.run(Thread.java:760)

java.lang.UnsupportedOperationException
        at java.util.regex.Matcher.group(Matcher.java:383)
        at com.mysql.cj.conf.ConnectionUrlParser.isConnectionStringSupported(ConnectionUrlParser.java:152)

public static boolean isConnectionStringSupported(String connString) {
        if (connString == null) {
            throw (WrongArgumentException)ExceptionFactory.createException(WrongArgumentException.class, Messages.getString("ConnectionString.0"));
        } else {
            Matcher matcher = SCHEME_PTRN.matcher(connString);
            return matcher.matches() && Type.isSupported(decode(matcher.group("scheme")));
        }
    }

return matcher.matches() && Type.isSupported(decode(matcher.group("scheme")));

public String group(int group) {
        ensureMatch();
        int from = matchOffsets[group * 2];
        int to = matchOffsets[(group * 2) + 1];
        if (from == -1 || to == -1) {
            return null;
        } else {
            return input.substring(from, to);
        }
    }

java.lang.UnsupportedOperationException

package com.stellaris.test;
import java.sql.DriverManager;

public class test {
    private static String ip = "XXX.XXX.XXX.XXX";
    private static String dbname = "XXX";
    private static String url = "jdbc:mysql://" + ip + "/"+ dbname +"?useSSL=false&serverTimezone=UTC&autoReconnect=true&failOverReadOnly=false  ";
    private static String driver = "com.mysql.cj.jdbc.Driver";
    private static String username = "XXX";
    private static String password = "XXXXXX";

    public static void main(String[] args) throws Exception {
        Class.forName(driver).newInstance();

        System.out.println(DriverManager.getConnection(url, username, password));

    }
}

implementation files('libs/mysql-connector-java-8.0.12.jar')
implementation files('libs/protobuf-java-3.6.1.jar')