Question

I keep getting this error when i’m trying to connect to my MySQL database:

exception

javax.servlet.ServletException: JDBC Problem: 
root cause

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.
root cause

java.net.ConnectException: Connection timed out: connect

here’s some code:

Connection con = null;
        Statement stmt = null;
        ResultSet rs = null;
        try{
            Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection
                    ("jdbc:mysql://mysql11.000webhost.com/database_name","user_name","password");
        stmt = con.createStatement();
        rs = stmt.executeQuery("INSERT into emailadresses('email') values ('"+email+"')");
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(EmailServlet.class.getName()).log(Level.SEVERE, null, ex);
        }catch(SQLException e){
            throw new ServletException("JDBC Problem: ", e);
        }

edit: I have the mysql-connector-java jar file in my libraries

EDIT: FOUND THE PROBLEM
I was looking for the answer on the site where I host my database and found this:

JDBC/ODBC is not supported here

that s*cks…

Answer 1

“Signals that an error occurred while attempting to connect a socket to a remote address and port. Typically, the connection was refused remotely (e.g., no process is listening on the remote address/port)”. – From Oracle Docs

Take a look into your connection string, be sure that the database, username and the password are correctly typed.

Another cause may be that your database server is not up.