JBOSS AS 7 and com.mysql.jdbc.Driver error

Question

I am using JBOSS AS 7.0.2. I want to create a connection to mysql server the old way (I know I should use JNDI, but I just need it for some quick thing):

Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection(.....);

I have mysql-connector-java-5.1.18-bin.jar included under C:\Java\jboss-as-7.0.2.Final\standalone\deployments. I also added it under build path. I can see my tables through Data Source Explorer. But when I try to connect to it through code, it throws exception when it tries to create new instance:

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

The ClassNotFoundException catch clause catches this exception:

Error: com.mysql.jdbc.Driver from [Module "deployment.Seminarska.war:main" from Service Module Loader]

I have found this thread with this solution:

As a rule you should not be including your JDBC drivers in your war file.

I suggest you mark the driver as provided and add it to the lib directory of the server.

What does mean mark the driver as provided? How does one do that?