code: private void resetLogger(Logger logger) {
          // Close all the Logger's handlers.
          Handler[] targets = logger.getHandlers();
          for (int i = 0; i < targets.length; i++) {
              Handler h = targets[i];
              logger.removeHandler(h);
              try {
                  h.close();
              } catch (Exception ex) {
                  // Problems closing a handler?  Keep going...
              }
          }
          String name = logger.getName();
          if (name != null && name.equals("")) {
              // This is the root logger.
              logger.setLevel(defaultLevel);
          } else {
              logger.setLevel(null);
          }
      }
docs: Private method to reset an individual target logger.