VBA连接正常，但Java没有

Question

I am trying to connect to MYSQL server hosted on MAMP Pro . I am trying to connect from the same client machine using java and VBA . VBA connects fine but java gives me the error after few seconds

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.

On Java

          String userName = "user";
          String password = "pass";
          String url = "jdbc:mysql://10.0.1.1/datab";
          Class.forName ("com.mysql.jdbc.Driver").newInstance ();
          conn = DriverManager.getConnection (url, userName, password);

On VBA

 Sub ConnectToDatabase()
        Set oConn = New ADODB.Connection
        oConn.Open "DRIVER={MySQL ODBC 3.51 Driver};" & _
            "SERVER=10.0.1.1;" & _
            "DATABASE=datab;" & _
            "USER=user;" & _
            "PASSWORD=pass;" & _
            "PORT=3306;" & _
            "Option=3"
      End Sub

telnet 10.0.1.1 3306 accepts connection from the client machine. My Bind address is the server IP on my.conf

I'm using mysql-connector-java 5.1.18

Answer 1

Try this for you Java DB URL:

jdbc:mysql://localhost:3306/datab

You verify that this does not work. Examine you class path and make sure the MySql driver is on you class path.

Your code should throw an exception here:

Class.forName("com.mysql.jdbc.driver").newInstance();

To get the error, alter your code like this:

try {
   Class.forName ("com.mysql.jdbc.Driver").newInstance ();
   conn = DriverManager.getConnection (url, userName, password);
}
catch (Exception e) {
  System.out.print(e.printStackTrace());
}

This will print the error in the Eclipse console so you can cut and paste it here.