code: public void setTransientMap(Map<String, byte[]> transientMap) throws InvalidArgumentException {
          if (null == transientMap) {
  
              throw new InvalidArgumentException("Transient map may not be set to null");
  
          }
          this.transientMap = transientMap;
      }
docs: Transient data added to the proposal that is not added to the ledger.
  
  @param transientMap Map of strings to bytes that's added to the proposal
  @throws InvalidArgumentException if the argument is null.