docs: <T> void setValueInternal(String key, T value) {
  		if (key == null) {
  			throw new NullPointerException("Key must not be null.");
  		}
  		if (value == null) {
  			throw new NullPointerException("Value must not be null.");
  		}
  
  		synchronized (this.confData) {
  			this.confData.put(key, value);
  		}
  	}