code: public MemberModel findMemberModelByC2jName(String memberC2jName) {
  
          MemberModel model = tryFindMemberModelByC2jName(memberC2jName, false);
  
          if (model == null) {
              throw new IllegalArgumentException(memberC2jName + " member (c2j name) does not exist in the shape.");
          }
  
          return model;
      }
docs: Returns the member model associated with the given c2j member name from this shape model.