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JBoss recipe of the day
If you need to access to the specific driver connection (for example the OracleConnection instead of the java.sql.Connection) then you need to use the WrappedConnection object and get its underlying connection:

Connection c = dataSource.getConnection();
org.jboss.resource.adapter.jdbc.WrappedConnection wc = (WrappedConnection) c;
OracleConnection ajc = (OracleConnection ) wc.getUnderlyingConnection();

Or another way, using reflection:

public static OracleConnection getOracleConnection(Connection conFromPool)
throws SQLException {

  try {
    Class[] parms = null;
    Method method =
      (conFromPool.getClass()).getMethod("getUnderlyingConnection",
                                       parms);
    return (OracleConnection) method.invoke(conFromPool, parms);

  } catch (InvocationTargetException ite) {
    throw new SQLException(ite.getMessage());
  } catch (Exception e) {
    throw new SQLException(e.getMessage());
  }
}