code: final void reallySetLogWriter(final PrintWriter out) throws ResourceException {
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
              Tr.debug(this, tc, "setting the logWriter to:", out);
  
          if (dataSourceOrDriver != null) {
              try {
                  AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() {
                      public Void run() throws SQLException {
                          if(!Driver.class.equals(type)) {
                              ((CommonDataSource) dataSourceOrDriver).setLogWriter(out);
                          } else {
                              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
                                  Tr.debug(this, tc, "Unable to set logwriter on Driver type");
                          }
                          return null;
                      }
                  });
              } catch (PrivilegedActionException pae) {
                  SQLException se = (SQLException) pae.getCause();
                  FFDCFilter.processException(se, getClass().getName(), "593", this);
                  throw AdapterUtil.translateSQLException(se, this, false, getClass());
              }
          }
  
          logWriter = out; // Keep the value only if successful on the DataSource.
      }
docs: This method is to be used by RRA code to set logwriter when needed