code: public Object getSQLJContext(WSRdbManagedConnectionImpl mc, Class<?> DefaultContext, WSConnectionManager connMgr) throws SQLException {
          return null;
      }
docs: This method returns a sqljConnectContext. It will go to DB2 to get the connection Context.
  We need to create a new WSJccConnection to get the phsyical sqlj context.So the sqlj runtime
  will use our WSJccConnection to do the work.
  
  @param a managedConnection
  @param DefaultContext the sqlj.runtime.ref.DefaultContext class
  @return a physical sqlj connectionContext for DB2 only or return null for other database
  @exception a SQLException if can't get a DefaultContext