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how to connect java swing application to mariadb DB using GSSAPI?

I have an application, which needs to connect to MariaDB DB version 10.1 using GSSAPI.
I have enabled the GSSAPI plugin on the database side, and have created a user via -
create user 'user'#'%' IDENTIFIED via 'gssapi' as 'user';
Now, i am trying to connect from the application as -
Class.forName("org.mariadb.jdbc.Driver");
con = DriverManager.getConnection(
"jdbc:mariadb://localhost:3305/schema?user='user'&gssapi-principal-name='user#localhost'");
stmt = con.createStatement();
I am getting the exception when i am trying to get the connection from DB -
java.sql.SQLInvalidAuthorizationSpecException: GSS-API authentication exception
at org.mariadb.jdbc.internal.util.ExceptionMapper.get(ExceptionMapper.java:121)
at org.mariadb.jdbc.internal.util.ExceptionMapper.throwException(ExceptionMapper.java:69)
at org.mariadb.jdbc.Driver.connect(Driver.java:110)
at java.sql.DriverManager.getConnection(Unknown Source)
Caused by: javax.security.auth.login.LoginException: Unable to obtain Principal Name for authentication
at com.sun.security.auth.module.Krb5LoginModule.promptForName(Unknown Source)
at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Unknown Source)
at com.sun.security.auth.module.Krb5LoginModule.login(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at javax.security.auth.login.LoginContext.invoke(Unknown Source)
at javax.security.auth.login.LoginContext.access$000(Unknown Source)
at javax.security.auth.login.LoginContext$4.run(Unknown Source)
at javax.security.auth.login.LoginContext$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.invokePriv(Unknown Source)
at javax.security.auth.login.LoginContext.login(Unknown Source)
at org.mariadb.jdbc.internal.packet.send.SendGssApiAuthPacket.send(SendGssApiAuthPacket.java:115)
... 46 more
Any idea how to resolve it?

mySQL remote database not connecting

Is there something I am missing?
My remote MySQL database is on Google Cloud and I gave access to my current external IP:
String myDriver = "org.gjt.mm.mysql.Driver";
String myURL = "jdbc:mysql://<remote IP address here>:3306/test";
System.setProperty("useSSL", "true");
System.setProperty("user", "test");
System.setProperty("password", "test");
System.setProperty("javax.net.ssl.keyStore","lib\\keystore");
System.setProperty("javax.net.ssl.keyStorePassword","password here");
System.setProperty("javax.net.ssl.trustStore","lib\\truststore");
System.setProperty("javax.net.ssl.trustStorePassword","password here");
Class.forName(myDriver);
connection = DriverManager.getConnection(myURL, System.getProperties());
System.out.println("Connection successful.");
It's telling me access denied.
here is the stacktrace:
Access denied for user 'test'#'my external IP' (using password: YES)
java.sql.SQLException: Access denied for user 'test'#'my external IP' (using password: NO)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1694)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1215)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2255)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2286)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2085)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:795)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:327)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Test.main(Test.java:16)

Check if you can telnet the ip address using the following command.
telnet remote-ip port.
As an example if u telnet google # port 80:
telnet 8.8.8.8 80
You will see this response:
Trying 8.8.8.8...
Connected to 8.8.8.8.
Escape character is '^]'.
The similar result should be observed when u telnet remote-ip. If not either that port is not open at google cloud or your ISP provider is blocking the outgoing traffic # port 3306.

Java connection failed with MySQL [duplicate]

This question already has answers here:
Connect Java to a MySQL database
(14 answers)
Closed 7 years ago.
I have created a MySQL database at hostinger.co.uk and now I am trying to make connection between the database and my Java application, and for that I have written this Java code:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class DB_Connection {
public static void main(String arg[]) throws Exception {
makeConnection("u335300563_myName", "pass12345");
}
public static void makeConnection(String username, String password) throws Exception {
Class.forName("com.mysql.jdbc.Driver");
Connection connection = DriverManager.getConnection("jdbc:mysql://u335300563_database",username,password);
PreparedStatement statement = connection.prepareStatement("select * from example");
ResultSet result = statement.executeQuery();
for(int i=1; result.next(); i++)
System.out.println(result.getString(i));
}
}
But this is throwing an exception that is:
Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: 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.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1036)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:338)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2232)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2265)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2064)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:790)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:395)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at DB_Connection.makeConnection(DB_Connection.java:14)
at DB_Connection.main(DB_Connection.java:9)
Caused by: java.net.UnknownHostException: u335300563_database
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(Unknown Source)
at java.net.InetAddress.getAddressesFromNameService(Unknown Source)
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:190)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:297)
... 16 more
So please tell what is the problem?

Caused by: java.net.UnknownHostException: u335300563_database
Program failed to identify the host of mysql DB.
In program, you have to pass correct hostname or IP address of the system hosted your mySQL:
Following line need to correct from
DriverManager.getConnection("jdbc:mysql://u335300563_database"
,username,password);
To
DriverManager.getConnection("jdbc:mysql://<IP Address of MySQL DB server or correct hostname with port number >",
username,password);

Communications link failure issue (How to test for URL)

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class Anime {
public static void main(String[] args) {
String url = "jdbc:mysql://xx.xxx.xxx.xx:3306/wordpress";
String user_name = "root";
String pass = "mypassword_is_here";
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection conn = DriverManager.getConnection(url,user_name, pass);
} catch ( Exception e ) {
e.printStackTrace();
}
}
}
And I keep getting this error
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: 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.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:344)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2332)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Anime.main(Anime.java:17)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:257)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:294)
... 15 more
Now I've looked around stackoverflow and it seems like this is usually because the url isn't correct or sometimes there is a firewall issue or the wait_timeout variable in mysql is too low (it isn't in my case).
By the way, I am trying to connect to an external database on a centOS linux server running mySQL.
So I'm wondering how I can test the URL outside the program to really see if it's because of the URL or the firewall or any of that for the matter. If you guys got any solutions, please let me know.

connecting to mysql database failing

Most recent problem is "Third Error" listed below.
I am working on an application in java that needs to connect to a database. Below is the code that i am using to attempt to connect to the database. The port is 3306 and i have the database set up on a machine here at my house on the network. For the ip address i am just using my external ip address to the world. The username and password were replaced for my protection. In my /etc/mysql/my.cnf, "bind_address" is commented out.
I have tried several things and can not seem to get this to work. This is my first time using JDBC... thanks for any help! Let me know if you need more information.
Class.forName("com.mysql.jdbc.Driver").newInstance();
System.out.println("before connection");
connect = DriverManager.getConnection("jdbc:mysql://ip-address/mjla_db", "username", "password");
System.out.println("connection established");
Here is the error that i keep getting:
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:344)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2332)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at school.cs321.mjla.MJLA.main(MJLA.java:30)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:257)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:294)
... 15 more
Second Error
After changing ip address to the internal ip address of the server.
java.sql.SQLException: null, message from server: "Host '192.168.1.102' is not allowed to connect to this MySQL server"
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1128)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2336)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at school.cs321.mjla.MJLA.main(MJLA.java:30)
Third error
When trying to access the database with the external ip address on an external network, i get the same error that i had initially.
I am using the "%" wild card for the Host of the username i am using for the application to authenticate to the database.

#Dave Newton: I was making the assumption that my firewall still had the port open for mysql, because i just got through working on a project where i did the same thing. However, i must have closed it a couple months ago. I checked a few minutes ago and it was disabled. So, i enabled and it is working fine now. Not sure why it had been closed...

Are you sure that the IP address in getConnection is correct? Can you try with
telnet youserver 3306
to see if there is a connection problem? Is there a firewall on the server?

Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/student", "root", "root");
just try it