[DOC][EAP 7.2] Access Vendor-Specific Classes

import java.sql.Connection;
import org.jboss.jca.adapters.jdbc.WrappedConnection;

...

Connection c = ds.getConnection();
WrappedConnection wc = (WrappedConnection)c;
com.mysql.jdbc.Connection mc = wc.getUnderlyingConnection();

import java.sql.Connection;
...
Connection c = ds.getConnection();
if (c.isWrapperFor(com.mysql.jdbc.Connection.class)) {
    com.mysql.jdbc.Connection mc = c.unwrap(com.mysql.jdbc.Connection.class);
}