Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2017-03-21 11:50:56 EET; 1 weeks 1 days ago
Main PID: 1209 (mysqld)

tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN

Status: inactive

Not shown: 993 closed ports
PORT     STATE SERVICE
21/tcp   open  ftp
22/tcp   open  ssh
25/tcp   open  smtp
80/tcp   open  http
110/tcp  open  pop3
143/tcp  open  imap
3306/tcp open  mysql

private final String WEBAPP_DB = "jdbc:mysql://192.168.0.4:3306/myDataBase";
private final String JDBC_DRIVER="com.mysql.jdbc.Driver";
private final String USERNAME = "myUserName";
private final String PASSWORD = "myPassWord";

Connection c = null;
PreparedStatement stm = null;

sq = "SELECT * FROM Machines";
try {
    Class.forName(JDBC_DRIVER);
    c = DriverManager.getConnection(WEBAPP_DB, USERNAME, PASSWORD);
    stm = c.prepareStatement(sq);
    ResultSet rs = stm.executeQuery();

    while(rs.next()){
        System.out.println("Machine = " + rs.getInt("id"));
    }

} catch (SQLException e) {
    e.printStackTrace();
} finally {
    if (stm != null) {
        stm.close();
    }
    if (c != null) {
        c.close();
    }
}

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.
...
Caused by: java.net.ConnectException: Connection refused: connect