MYSQL connection timeout?

Question

Hi all, ive been trying to update mysql databases on localhost and everything work perfect, but then im trying todo that in hosting (in this case phpnet.us). Im getting connection timeout error
com.mysql.jdbc.CommunicationsException: Communications link failure due to under
lying exception:
** BEGIN NESTED EXCEPTION **
java.net.ConnectException
MESSAGE: Connection timed out: connect
STACKTRACE:
java.net.ConnectException: Connection timed out: 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.ja
va:173)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:267)
        at com.mysql.jdbc.Connection.createNewIO(Connection.java:2739)
        at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java
:266)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at palidino76.rs2.util.SQLHandler.createConnection(SQLHandler.java:20)
        at palidino76.rs2.Engine.run(Engine.java:147)
        at java.lang.Thread.run(Unknown Source)
** END NESTED EXCEPTION **
Last packet sent to the server was 31 ms ago.
        at com.mysql.jdbc.Connection.createNewIO(Connection.java:2814)
        at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java
:266)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at palidino76.rs2.util.SQLHandler.createConnection(SQLHandler.java:20)
        at palidino76.rs2.Engine.run(Engine.java:147)
        at java.lang.Thread.run(Unknown Source)my connection looks like this
     public static void createConnection() {
          try {
                    System.out.println("Creating connection to mysql server.");
               String serverName = "sql306.phpnet.us:3306";
               String mydatabase = "pn_2815767_java";
               String url = "jdbc:mysql://" + serverName + "/" + mydatabase;
               Class.forName("com.mysql.jdbc.Driver").newInstance();
               con = DriverManager.getConnection(url, "pn_2815767", "password");
               stmt = con.createStatement();
          } catch (Exception e) {
               e.printStackTrace();
     }I'm messed up, if you know the problem please help.

Answer 1

Use a connection pool and it will automatically take care of this for you (as long as you retreive the connection from the pool everytime you need it, and not just once at the start of the app, and close it as soon as you finish using it, not just at the "end" of the app, closing a pool connection simply returns it to the pool, it does not actually close it).
Edit: That is, if the DB is part of the hosting service. If you are having the problem by the actual connection attempt, and the DB is located someplace else, then it is probably a routing/firewall issue. I.E. the hosting service is not allowing you to connect to it.